At the center of every atom lies a small, dense ____________ that is positively charged



HURRRRRRYYYYYYYYY 50PTS

Answers

Answer 1
At the center of every atom lies a small, dense "nucleus" that is positively charged.

Atom is the smallest unit of matter. It is made up of electrons, protons and neutrons. Electrons are negatively charged particles that are found scattered in different energy levels outside the nucleus. Protons are positively charged particles present inside the nucleus. Neutrons do not carry charge and found inside the nucleus. Thus, protons and neutrons make up the nucleus of an atom. Since, protons are positively charged and neutrons are uncharged particles, the charge of nucleus becomes positive. 
Answer 2

At the center of every atom lies a small, dense nucleus that is positively charged.

The nucleus is made up of protons and neutrons. Protons have a positive charge, while neutrons have no charge.

The number of protons in the nucleus is equal to the atomic number of the atom. The atomic number is a unique number that identifies an element. For example, the atomic number of carbon is 6, which means that there are 6 protons in the nucleus of a carbon atom.

The number of neutrons in the nucleus can vary. For example, the most common form of carbon has 6 neutrons, but there are also forms of carbon with 7 neutrons and 8 neutrons.

The nucleus is held together by the strong nuclear force. The strong nuclear force is a very strong force that binds protons and neutrons together.

The nucleus is very small compared to the atom as a whole. The radius of the nucleus is about 10-15 meters, while the radius of the atom is about 10-10 meters.

The nucleus is important for the chemical properties of the atom. The number of protons in the nucleus determines the element of the atom, while the number of neutrons affects the isotopes of the element.

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Related Questions

symbol for aluminum foil ?

Answers

Al (s) with a bit of Al2O3 (s)

Final answer:

The symbol for aluminum foil is Al. It is a silvery-white, soft, nonmagnetic, and ductile metal.

Explanation:

The symbol for aluminum foil is Al. Aluminum is a chemical element with the symbol Al and atomic number 13. It is a silvery-white, soft, nonmagnetic, and ductile metal in the boron group. Aluminum foil is commonly used in packaging, cooking, and insulation.

In the disproportionation reaction CI2 + H2Omc021-1.jpgHCIO + HCI, what describes the oxidation states of the substance Cl?
Cl has an oxidation number of 2 in Cl2. It is then reduced to Cl with an oxidation number of 1 in both HCl and HClO.
Cl has an oxidation number of –1 in Cl2. It is then oxidized to Cl with an oxidation number of 1 in both HCl and HClO.
Cl has an oxidation number of 0 in Cl2. It is then reduced to CI- with an oxidation number of –1 in both HCl and HClO.
Cl has an oxidation number of 0 in Cl2. It is then reduced to CI- with an oxidation number of –1 in HCl and is oxidized to Cl+ with an oxidation number +1 in HClO

Answers

Reaction: CI2 + H2O    ---->  HCIO + HCI

Oxidations states:

The oxitation state of Cl2 = 0, because the oxidation state of an atom alone or a molucule with one kind of atom is always 0.

The oxidation state of Cl in HClO is +1 because the oxidation state of H is + 1, the oxidation state of O is - 2, and the molecule is neutral, so  +1 + 1 - 2 = 0

The oxidation state of Cl in HCl is - 1, because the oxidation state of H is +1 and the molecule is neutral, so - 1 + 1 = 0.

Also, you shall remember that when an atom increases its oxidation state is is oxidized and when an atoms reduces its oxidations state it is reduced.

With that you conclude that the right option is the last statement: Cl has an oxidation number of 0 in Cl2. It is then reduced to CI- with an oxidation number of –1 in HCl and is oxidized to Cl+ with an oxidation number +1 in HClO

Answer:

in other words its D

Explanation:

Solid lithium metal and diatomic nitrogen gas react spontaneously. give the balanced chemical equation (including phases) that describes this reaction.

Answers

The balanced chemical equation  between sodium lithium metal and diatomic nitrogen gas is given by;

6Li(s) + N2(g) → 2Li3N(s)

Further Explanation:Chemical equations  Chemical equations are equations showing reactions between reactants to form products. Chemical equations show the reactants or starting substances and products or substances formed during the reaction.Law of conservation of mass  The law of conservation requires that when writing chemical equations, the mass of the reactants should be equal; to the mass of the products.This is done by making sure the number of atoms of each element involved in the chemical equation is equal on both sides of the equation.To ensure the law of conservation in chemical equations is observed we balance chemical equations.Balancing chemical equation:Balancing chemical equations is a try and error method that ensures the number of atoms in the side of the reactants is equal to the number of atoms in the side of products.Balancing chemical equations may also require inclusion of state symbols which shows the state of each compound or element involved in the chemical reactions.For example; the equation; 6Li(s) + N2(g) → 2Li3N(s) is balanced as the number of titanium and oxygen atoms are equal on both sides of the equation.There are six Lithium atom and 2 nitrogen atoms  on either side of the equation.

Keywords: Chemical equations, balancing of chemical equations

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Level: high school

Subject: Chemistry

Topic: Chemical equations

Sub-topic: Balancing chemical equations  

The balanced chemical equation for the reaction between lithium metal and nitrogen gas to form lithium nitride is 6 Li (s) + N₂ (g) → 2 Li₃N (s). This reaction is exothermic.

The reaction between solid lithium metal and diatomic nitrogen gas produces lithium nitride.

The balanced chemical equation for this reaction is as follows:

Balanced Chemical Equation : 6 Li (s) + N₂ (g) → 2 Li₃N (s)In this reaction, six atoms of lithium react with one molecule of nitrogen gas to form two formula units of lithium nitride.

This reaction is exothermic, meaning it releases heat.

Correct question is: Solid lithium metal and diatomic nitrogen gas react spontaneously to form a solid product. give the balanced chemical equation (including phases) that describes this reaction. indicate the phases using abbreviation (s), (I), (g) for solid, liquid and gas

Where are elements heavier than iron made

Answers

All of the post-iron elements are formed in supernova explosions themselves. So much energy is released during a supernova explosion that the freed energy and copious free neutrons streaming from the collapsing core drive massive fusion reactions, long past the formation of iron.
Final answer:

Elements heavier than iron are created during the violent explosion of a star known as a supernova. After the supernova, these elements are ejected into space and later form new stars and planets. Our presence on Earth, abundant in heavy elements, is a result of generations of stars synthesizing these elements.

Explanation:

Elements heavier than iron are made in the core of massive stars during the process of nucleosynthesis. However, when these stars exhaust their nuclear fuel, they die in an event known as a supernova. As the star explodes, its violent conditions lead to the creation of elements heavier than iron. The fusion of silicon into iron is the last step in nonexplosive element production inside a star. Beyond this point, due to iron's stability, fusion reactions end up absorbing energy instead of releasing it, leading to the star's collapse.

Most of these heavy elements are later ejected into space, enriching interstellar space with heavier elements. Over time, these elements are recycled to form new stars and planets, progressively leading to an increase in the proportion of heavier elements in the universe. Therefore, our presence on Earth, which is rich in heavy elements like silicon and iron, is due to generations of stars synthesizing these elements.

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In a unimolecular reaction with three times as much starting material as product at equilibrium, what is the value of keq? is δg o positive or negative? enter keq as a decimal. be sure to answer all parts.

Answers

A. The formula for Keq is:

Keq = concentration of product [B] / concentration of reactant [A]

where

A = 3 B

 

Therefore Keq is:

Keq = [B] / [3 B]

Keq = 0.33

 

B. The formula for ΔG° is:

ΔG° = - R T ln(Keq)

Since Keq is 0.33 and ln Keq = - 1.1, therefore:

ΔG° = - R T (- 1.1)

ΔG° = +

Therefore ΔG° is positive

Final answer:

The value of Keq for the unimolecular reaction with three times as much starting material as product at equilibrium is 1.73. The value of ∆G° is positive.

Explanation:

In a unimolecular reaction with three times as much starting material as product at equilibrium, the value of Keq can be calculated by taking the square root of the concentration ratio of product to reactant. Since there is three times as much starting material as product, the concentration ratio is 3:1. Taking the square root of this ratio gives us a Keq value of 1.73 (rounded to two decimal places).

The value of ΔG° for a reaction can determine whether it is spontaneous or non-spontaneous. If ΔG° is negative, the reaction is spontaneous and can proceed without any outside intervention. If ΔG° is positive, the reaction is non-spontaneous and requires an input of energy to proceed. In this case, since the reaction is at equilibrium and there is three times as much reactant, the value of ΔG° would be positive.

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Write the ions present in solution of AgNO3. Express your answers as chemical formulas separated by a comma. Identify all of the phases in your answers.

Answers

Answer: The ions present in a given solution of silver nitrate are [tex]Ag^+,NO_3^-[/tex]

Explanation:

Silver nitrate is a strong electrolyte because it displaces into its ions in aqueous solution.

The chemical reaction for the ionization of silver nitrate solution follows the equation:

[tex]AgNO_3(aq.)\rightarrow Ag^+(aq.)+NO_3^-(aq.)[/tex]

By Stoichiometry of the reaction:

1 mole of silver nitrate solution ionizes into 1 mole of silver ions and 1 mole of nitrate ions.

Hence, the ions present in a given solution of silver nitrate are [tex]Ag^+,NO_3^-[/tex]

The chemical formula is[tex]\boxed{{\text{A}}{{\text{g}}^ + }{\text{,N}}{{\text{O}}_{\text{3}}}^ - }[/tex].

The phases of ions are[tex]\boxed{{\text{aqeuous phase}}}[/tex].

Further explanation:

Ionic compound:

Ionic compounds are those compounds formed from the ions of the species. Ions are the species that are formed due to the loss or gain of electrons. Cation forms by the loss of electrons and anion forms by the gain of electrons in a neutral atom.

Some of the properties of ionic compounds are as follows:

1. These are hard solids.

2. They have high melting and boiling points.

3. They are considered as good conductors of heat and electricity.

Ionic reaction:

Ionic reaction is a type of chemical reaction in which molecules in aqueous solution dissociate to form ions. In ionic reaction, the net charge is same on both sides.

[tex]{\text{AgN}}{{\text{O}}_{\text{3}}}[/tex]is a strong electrolyte and dissociates into ions in the aqueous solution. The reaction for dissociation of [tex]{\text{AgN}}{{\text{O}}_{\text{3}}}[/tex] solution is:

[tex]{\text{AgN}}{{\text{O}}_{\text{3}}}\left({aq}\right)\to{\text{A}}{{\text{g}}^+}\left({aq}\right)+{\text{N}}{{\text{O}}_{\text{3}}}^-\left({aq}\right)[/tex]

In this reaction, 1 mole of [tex]{\text{AgN}}{{\text{O}}_{\text{3}}}[/tex] dissociates to form 1 mole of [tex]{\text{A}}{{\text{g}}^+}[/tex] and 1 mole of [tex]{\text{N}}{{\text{O}}_{\text{3}}}^-[/tex].

Therefore, ions present in the solution of silver nitrate are [tex]{\text{A}}{{\text{g}}^+}[/tex], [tex]{\text{N}}{{\text{O}}_{\text{3}}}^-[/tex]. As ions are formed in solution only, so the phase of both the ions is aqueous phase.

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Answer details:

Grade: High School

Subject: Chemistry

Chapter: Chemical compound

Keywords: Ionic compound, aqueous solution, good conductor, high enthalpy, ions, dissociates, AgNO3, Ag+ and NO3-.

Describe the difference between a polar and a nonpolar covalent bond. give and explain an example of each type of bond.

Answers

in polar covalent bond two different type of electrons share electrons but in non polar covalent bond two same type of atoms share equal number of electrons 
examples of non polar covalent bonds are cl2,n2,o2
examples of polar covalent bond is wter molecule H2O

Why does naphthalene have a higher melting point than biphenyl?

Answers

Naphthalene has a higher melting point than biphenyl because naphthalene is a polar compound while biphenyl is a non-polar compound. Studies show that polar compounds have higher melting and boiling points than nonpolar compounds. It is because polar compounds have strong intermolecular forces.

Final answer:

Naphthalene has a higher melting point than biphenyl due to its compact structure with fused benzene rings, resulting in greater π-electron delocalization and stronger intermolecular forces. The fulfillment of Hückel's rule with its 10 π electrons also contributes to naphthalene's stability and higher melting point.

Explanation:

Naphthalene has a higher melting point than biphenyl because of its structural differences and the stronger intermolecular forces that result from these differences. Naphthalene is composed of two fused benzene rings, which means it has a more compact structure and a greater degree of π-electron delocalization than biphenyl, which consists of two benzene rings connected by a single bond.

The π-electron delocalization in naphthalene contributes to a greater stability and a higher degree of symmetry than biphenyl, which in turn leads to stronger intermolecular forces, namely London dispersion forces. Furthermore, naphthalene fulfills Hückel's rule with its 10 π electrons, which provides additional stability due to the filled bonding molecular orbitals. These factors result in a higher energy requirement to overcome the intermolecular forces in naphthalene, thereby giving it a higher melting point compared to biphenyl.

in an aqueous solution of lithium chloride LiCl, what ions or molecules are present in solution

Answers

In an aqueous solution of lithium chloride (LiCl), the ions present in solution are lithium cations (Li+) and chloride anions (Cl-), and the water molecules (H2O). 

Lithium chloride is an ionic salt, and therefore, fully dissociates or ionizes upon dissolution in water. From the chemical formula of lithium chloride, we can say that 1 lithium ion (positively-charged) only needs 1 chloride ion (negatively charged) to form the salt. Thus, upon dissociation of 1 molecule of LiCl, only 1 lithium ion, and 1 chloride ion form. 

Water is a molecule formed by covalent bonds and generally, does not dissociate to form ions. However, if we consider the very minor contribution of the dissociation of water, hydroxide (OH-) ions and hydronium (H3O+) ions will also be present. However for water, very few molecules, only 1 in 550 million, are dissociated at any given time. Thus, we can consider the presence of the OH- and H3O+ ions to be negligible and just identify the molecular undissociated form of water to be present. 


Final answer:

In an aqueous solution of LiCl, the compound dissociates completely into hydrated lithium ions (Li+(aq)) and chloride ions (Cl-(aq)), both surrounded by water molecules due to the polarity of water.

Explanation:

In an Aqueous Solution of Lithium Chloride (LiCl), What Ions or Molecules Are Present?

Lithium chloride (LiCl) is an ionic compound that dissociates completely in water due to the strong ion-dipole interactions between the ions and the polar water molecules. When LiCl is dissolved in water, it separates into its constituent ions, lithium (Li+) and chloride (Cl−). The process is facilitated by the polar nature of water molecules which arrange themselves around the ions to form a hydration shell. The oxygen ends of water molecules point towards lithium ions due to their positive charge, while the hydrogen ends tend to surround the chloride ions because of their negative charge. As a result, the solution contains hydrated lithium ions (Li+(aq)) and hydrated chloride ions (Cl−(aq)), indicating they are surrounded by water molecules in the solution.

Thus, in an aqueous solution of lithium chloride, the present species are Li+(aq) and Cl−(aq), fully dissociated and surrounded by water molecules, reflecting their hydrated state.

HELP!!! WILL AWARD!
What is nuclear fission?
the creation of high-energy plasma
when two or more atomic particles stick together and form a heavier atomic nucleus
the splitting of the atomic nucleus into parts


Why does radioactive decay occur?

The electric force and nuclear forces are in opposition to each other.

The electric force causes electrons to be released.

Nuclear forces disintegrate protons.

Answers

The answer for the first question would be D) The splitting of the atomic nucleus into parts and for the second question, the answer would be D) Nuclear forces disintegrate protons.

Answer:

D. the splitting of the atomic nucleus into parts

D.The electric force and nuclear forces are in opposition to each other.

Explanation:

What is the half-life of iron-59, a radioisotope used medically in the diagnosis of anemia, if a sample with an initial decay rate of 16,800 disintegrations/min decays at a rate of 10,860 disintegrations/min after 28.0 days?

Answers

1) Data:

initial decay rate, No =16,800 disintegrations/min

final decay rate, Nf = 10,860 disintegrations/min

t = 28.0 days

t half-life =?

2) Formulas

Radioactive disintegration =>

Nt = No * e ^ (-kt)

t half-life = ln (2) / k

3) Solution

From Nt = No * e^ (-kt) =>

Nt / No = e ^ (-kt)

=> -kt = ln (Nt / No)

=> kt = ln (No/Nt)

=> k = ln (No / Nt) / t

=> k = ln (16,800 / 10,860) / 28 days = 0.01558 days^ -1

From t half-life = ln(2) / k

t half-life = ln(2) / (0.01558 days^-1) = 44.5 days.

Answer: 44.5 days.


Final answer:

To determine the half-life of iron-59, the decay rate formula is applied, using the provided decay rates and the time period. After calculations, the half-life of iron-59 is found to be approximately 44.5 days.

Explanation:

The half-life of a radioisotope can be determined by understanding how the decay rate changes over time. In this case, we need to find the half-life of iron-59, knowing that its initial decay rate is 16,800 disintegrations per minute, which falls to 10,860 disintegrations after 28.0 days.

To find the half-life of iron-59, we use the decay rate formula:
N(t) = N0 * (1/2)^(t/T), where N(t) is the decay rate at time t, N0 is the initial decay rate, and T is the half-life.

Plugging in the values we have, we get 10,860 = 16,800 * (1/2)^(28/T). To solve for T, we rearrange and take the natural logarithm of both sides to get T as the subject. In so doing, we find that the half-life of iron-59 is approximately 44.5 days.

Assuming all orbitals are in the same energy level which type of orbital has the lowest energy

Answers

The correct answer is S orbital (apex)

Answer:

s atomic orbital

Explanation:

Lets us consider 4s, 4p, 4d and 4f. Here 4 is the energy level or the principal quantum number. For all the atomic orbital s, p, d and f the energy level is the same. But the energy level of each  

Atomic orbital is different. s atomic orbital has the lowest energy followed by p, d and f.  

Arranging the atomic orbitals in order of increasing energy:

s < p < d < f

A regulation nfl playing field of length x and width y has a perimeter of 346 2/3 or 1040/3 yards. What is width (y) and the area (a) of the rectangle.

Answers

Final answer:

The width (y) of the NFL field is 53 1/3 yards, and the area (a) is 6399 1/3 square yards, using a length (x) of 120 yards.

Explanation:

The regulation NFL playing field is a rectangle. If the length is x and the width is y, the perimeter of the rectangle is represented as 2(x+y) which equals 346 2/3 or 1040/3 yards according to your question.

Given the standard dimensions of an NFL field, the length x is 360ft (120 yards) and the width y is 160ft (53 1/3 yards). Now we approach this problem using this knowledge.

To find the width y, we can rearrange the formula: y = 1040/6 - x/2. Substituting x = 120 yards into this equation, we find that y = 53 1/3 yards.

The area of the rectangle (field), represented by a, is found by multiplying the length by the width (x*y). Therefore, the area is a = 120 * 53 1/3 = 6399 1/3 square yards.

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some studies has shown that peppermint odor increase people's mental sharpness especially when they solve math problems which best describes how this could be a valid scientific claim

Answers

"if it is tested in a controlled setting with repeated results" is the statement among the choices given in the question that best describes that can possibly make this scientific claim valid. The correct option among all the options that are given in the question is the first option or option "A". I hope the answer has helped you.

Answer:

If it is tested in a controlled setting with repeated results.

Explanation:

Hello,

Every scientific foundation is preceded by a series of repetitive tests which allow the scientists to state both reliable and trustful conclusions. In such a way, by repeating the aforesaid test, the conclusion is strengthened, nevertheless, those tests must be carried out in a controlled manner in order to assure that the proposed conclusion is suitable under the specified conditions for scientific claims.

Best regards.

Is all matter made up of tiny particles called atoms?

Answers

This is true. All everyday objects are composed of atoms. Everything we can feel and see. All things are made of atoms. Usually consisting of a nucleus, protons, neutrons, and a cloud of orbiting electrons. 

Answer:

true

Explanation:

Scientists measure the time between the arrival of an earthquake's _______ and _______ waves to help determine the distance between the recording seismograph and the earthquake epicenter.

Answers

The answer to your question is primary and secondary waves

Which of the following metals may tarnish to a greenish-blue color called verdigris
A- silver
B- chromium
C- gold
D- copper

Answers

copper. thats the way copper oxidized. like the statue of liberty 

Answer:

The correct answer is: D. copper

Explanation:

Copper is a chemical element that belongs to the group 11 and period 4 of the periodic table. It is a d-block element that has atomic number 29. Copper is a pinkish-orange colored metal that has high conductivity.

It readily oxidizes when exposed to atmospheric oxygen to form a greenish-blue layer of copper carbonate. This layer is known as verdigris or patina.

Which of the following processes would you predict to have a positive value for º ? 2SO2(g) + O2(g) → 2 SO3(g) P4O10(s) + 6H2O(l) → 4H3PO4(s) 2POCl3(g) → 2PCl3(g) + O2(g) 2H2(g) + O2(g) → 2H2O(l)

Answers

The answer is C in plato

Answer:

[tex]2POCl_3(g) --> 2PCl_3(g) + O_2(g)[/tex]

Explanation:

Hello,

For the listed chemical reactions, one can predict the one which has a positive ΔS° is:

[tex]2POCl_3(g) --> 2PCl_3(g) + O_2(g)[/tex]

This is foreseen owing to the greater number of products (2) by contrast with the number of reagents (1). Moreover, for such reaction, there is a greater amount of moles at the products than at the reagents.

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The isotope of an atom containing 40 protons and 51 neutrons suddenly has two neutrons added to it.What isotope is created

Answers

Zirconium-93 is created :)

The correct answer is  

Zirconium-93

Since nothing else matches up with 40 protons  and 51 neutrons

So your answer is  

Zirconium-93

Name the type of reaction and give the coefficients needed to balance the following skeleton reaction: ___Mg + ___Fe2O3 → ___Fe + ___MgO

Answers

  Mg  + Fe2O3→ Fe  +mgO  

The  coefficients needed to balance the reaction above is  3, 1,2,3  

the  reaction  is a single  replacement reaction/ single displacement  reaction

 The balanced  equation is is therefore

 = 3Mg + Fe2O3 → 2Fe  + 3MgO

The equation  above is  balanced  since it obey the law of mass conservation. that is the number  of atom  in side of  reactant is equal to number of atoms  in product side.for example  there is  3 atoms  of Mg  in reactant side  and 3 atoms of Mg  in product side.

 The  reaction is  a single replacement  reaction  because  Mg replaces Fe  from  its  compound.


The given reaction is a redox reaction known as a single displacement or single replacement reaction. The coefficients needed to balance the equation are as follows:

2Mg + Fe₂O₃ → 2Fe + 3MgO

A single displacement reaction, also known as a single replacement reaction, is a type of chemical reaction in which an element or ion in a compound is replaced by another element. In this reaction, one element is displaced from its compound and takes the place of another element, resulting in the formation of a new compound. The general format of a single displacement reaction can be represented as:

A + BC → AC + B

Where A is the element that displaces B from the compound BC, leading to the formation of the new compound AC. This type of reaction is often observed in reactions involving metals and their salts, where a more reactive metal displaces a less reactive metal from its salt solution. The reactivity of the elements involved determines the feasibility and outcome of the reaction.

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Explain why it is not possible to draw a skeletal structure for methane.

Answers

because its structure is drawn by dots which can't describ its structure.

Since its structure is depicted by dots, which cannot describe it,

Tetrahedral molecules like methane have four comparable C-H bonds.

Methane's chemical makeup:

An organic compound's skeletal structure is made up of a group of atoms that are joined together to form the compound's fundamental structure. Chains, branches, and/or rings of bound atoms can make up the skeleton. Heteroatoms are skeletal atoms that are not carbon or hydrogen.

How can we know that methane has four spheres?

We start with what we already know: the geometry of the methane molecule has the carbon at the center and the four C-H bonds pointing towards the corners. In methane, the carbon atoms form four bonds, one to each of the four hydrogen atoms.

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Which of these molecules has the same number of shared electron pairs as unshared electron pairs? (a) hcl, (b) h2s, (c) pf3, (d) ccl2f2 (e) br2?

Answers

Let us check each molecule

a) HCl : the number of shared electron pairs is "one"

the number of unshared electron pairs is six [on chlorine]

b) H₂S : the number of shared electron pairs is "two" as there are two bonds of sulphur with two hydrogen atoms.

The number of valence electrons on sulphur are six, out of these two are involved in bonding and rest four are in the form of two unshared (lone pair) pair of electrons

So in H₂S it has the same number of shared electron pairs as unshared electron pairs

c) PF₃ : the shared pair of electrons are "three"

the number of unshared electron pairs is one on phosphorous.

d) CCl₂F₂ : there are total four shared pair of electrons on carbon and zero unshared electron pairs

e) Br₂ : only one shared electron pair and three unshared electron pairs

The molecule that has the same number of shared electron pairs as unshared electron pairs is H2S.

In a molecule, chemical bonds are formed when atoms share electrons. However, some atoms have unshared electron pairs on their valence shells. These unshared electron pairs are called lone pairs and are localized on one of the atoms in the bond.

In the molecule H2S. There are two lone pairs or unshared pairs on sulfur and there are two shared pairs of electrons in the molecule. Hence the molecule that has the same number of shared electron pairs as unshared electron pairs is H2S.

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a nuclear reaction energy is released by combinations of two elements into new element group process

Answers

It sounds to me like "A" is the answer. Yup, it is

Which olefin should predominate in the product of the dehydration of 2-methyl-2-butanol?

Answers

Final answer:

The predominant olefin formed in the dehydration of 2-methyl-2-butanol is 2-methylbutene.

Explanation:

The predominant olefin formed in the dehydration of 2-methyl-2-butanol is 2-methylbutene. During the dehydration process, a water molecule is eliminated from 2-methyl-2-butanol, resulting in the formation of 2-methylbutene. This is the major product because it is the most stable and thermodynamically favored product.

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Final answer:

The olefin that would be predominate in the product of the dehydration of 2-methyl-2-butanol is 2-methyl-2-butene, also known as isobutene. The dehydration involves the removal of a hydrogen and a hydroxyl group, resulting in the formation of a double bond, creating the said olefin. The formation of isobutene is favored due to its relatively more stable structure.

Explanation:

The olefin that should predominate in the product of the dehydration of 2-methyl-2-butanol is 2-methyl-2-butene, also known as isobutene. This reaction can produce either a cis-isomer or a trans-isomer.

The process of dehydration involves the removal of a hydrogen and a hydroxyl group (OH) from the 2-methyl-2-butanol molecule under the influence of a strong acid like sulfuric acid. This results in the formation of a double bond, creating the said olefin - 2-methyl-2-butene. The formation of isobutene is favored due to its relatively more stable structure, which is attributed to increased steric hindrance in the molecule.

Finally, it's worth noting that the overall intermolecular forces (IMFs), particularly hydrogen bonding, are important factors affecting the vapor pressure of the resultant olefin.

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A stream of air (21 mole% o2, the rest n2) flowing at a rate of 10.0 kg/h is mixed with a stream of co2. the co2 enters the mixer at a rate of 20:0 m3/h at 150°c and 1.5 bar. what is the mole percent of co2 in the product stream?

Answers

Molecular weight of air = 29 g/mole, moles of air entering = 5/29 kgmoles/hr= 0.1724 kg moles/hr
Moles of N2= 0.21*0.1724=0.036 kg moles/hr, moles of N2= 0.79*0.1724= 0.1362 kgmoles/hr
Moles of CO2 can be calculated from gas law equation, n= PV/RT
V= 25 m3/hr= 25* 1000 L/hr, P= 2 bar = 2*0.9869 atm,=1.9738 atm R= 0.0821 L.atm/mole.K T= 100 deg.c =100+?273.15= 373.15K
n= number of moles of CO2= 1.9738*25*1000/ (0.0821*373.15) =1611 moles/hr= 1.611 kg moles/hr
total moles of mixture = 0.1724 +1.611 =1.7834 kg moles/hr
Moles % CO2 in the mixed stram = 100*1.611/1.7834 = 90.33%
Answer is 90.33%
Final answer:

To determine the mole percent of CO2 in a stream of mixed gases, one would first calculate the moles of each gas. The mole percent of CO2 in this case can be calculated as approximately 73%.

Explanation:

The mole percent of CO2 in the product stream can be calculated by determining the number of mols of each gas and then using these values to calculate the mole fractions. First, we need to calculate the number of mols for air and CO2 separately.

Initial air is given as 10.0 kg/h, and it is composed of 21 moles% O2 and the rest is N2. Given that the molar mass of O2 is approximately 32 g/mol and N2 is approximately 28 g/mol, this gives us a total of approximately 0.289 moles of air per second. Next, the number of moles of CO2 entering the mixer can be calculated using the ideal gas law formula PV=nRT. Assuming standard pressure for this equation, we get approximately 0.784 moles of CO2 per second.

Finally, the mole percent of CO2 in the product could be calculated as the number of moles of CO2 divided by the total number of moles (number of moles of CO2 + number of moles of air) multiplied by 100. Plugging in the values gives us approximately 73% mole percent of CO2 in the product.

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Scientific theories are subject to change. true or false

Answers

True, that's why they are called theories and not facts.
The answer is true what can't be changed is a scientific law. Hope this helps plz give brainliest.

Which of these orbital designations are invalid?
a. 4s
b. 2d
c. 3f
d. 3p

Answers

the answer would either be B or C 

its got to be B (i think)

When methane is burned with oxygen, the products are carbon dioxide and water. if you produce 9 grams of water and 11 grams of carbon dioxide from 16 grams of oxygen, how many grams of methane were needed for the reaction? 4 31 20 40 none of the above?

Answers

4 grams of methane is burned with oxygen,.  Hope this helped

Consider an ideal gas with a volume of V1. To what volume would you need to compress the gas to double its pressure? Express your answer in terms of V1.

Answers

The Boyle's Law says "P1V1 = P2V2"
Now your pressure is 2P1. That will make the volume 1/2V1 so 2P1 * 1/2V1 = P1V1

Answer: The final volume should be [tex]\frac{V_1}{2}[/tex]

Explanation:

To calculate the new pressure, we use the equation given by Boyle's law. This law states that pressure is directly proportional to the volume of the gas at constant temperature.  

The equation given by this law is:

[tex]P_1V_1=P_2V_2[/tex]

where,

[tex]P_1[/tex] = initial pressure of gas= P atm

[tex]V_1[/tex] =  initial volume of gas = [tex]V_1[/tex]

[tex]P_2[/tex] = final pressure of gas= 2P

[tex]V_2[/tex] = final volume of gas = ?

Putting values in above equation, we get:

[tex]P\times V_1=2P\times V_2[/tex]

[tex]V_2=\frac{V_1}{2}[/tex]

Thus the final volume should be [tex]\frac{V_1}{2}[/tex]

How many hydrogen atoms are in 8.90 mol of ammonium sulfide?

Answers

Assuming that the ammonium sulfide formula is (NH4)2S then you can see that there are 2 nitrogen, 8 hydrogen and 2 sulfur atoms for every ammonium sulfide. If the amount of ammonium sulfide is 8.9 moles, then the number of hydrogen atoms should be: 8/1 * 8.9 mol= 71.2 moles.
If you are asked the number of individual atoms you need to multiply it with Avogadro number like this : 71.2 moles * 6.02 * 10^23= 4.28 *10^25

The number of hydrogen atoms in 8.90 mol of ammonium sulfide is  4.28×10²⁵ atoms.

What is Avogadro's constant?

This is referred to as a proportionality factor which tells us about the number of constituent particles in a sample. The constant is  6.02ₓ 10²³.

Ammonium sulfide which is denoted as (NH4)₂S has 2 nitrogen, 8 hydrogen and 2 sulfur atoms present.

We were told that the amount of ammonium sulfide is 8.90mol.

Number of hydrogen atoms =  8/1 × 8.9 mol= 71.2 moles of H₂.

The number of Hydrogen atoms in  8.90 mol of ammonium sulfide is 71.2 moles ˣ 6.02ˣ 10²³ = 4.28 ˣ10²⁵ atoms.

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