Select the correct answer.
You have a nightlight plugged into an outlet in the hallway, which uses 3.5 watts when plugged in. If the house circuit provides 120.0 volts, what is the
current through this bulb?

Answer:

Ionic compounds differ from ions in that the overall charge in ionic compounds equals zero while the overall charge in ions is less than or greater than zero. Ions have a superscript number followed by a either a positive or a negative sign. Where both signs appear in the same formula they make it an ionic compound.

Answer:

An acid and a Base :)

Explanation:

I just took the test got a 96 A

The oxidation state of Na decreases from 1 to 0 in this reaction Li (s) + NaOH (aq) → LiOH(aq) + Na(s).

Oxidation state is also called Oxidation number is defined as the number assigned to atoms in molecules to represent the general distribution of electrons.

A chemical reaction is a process in which chemical bonds between atoms to break and reorganize, to form other new substances.

The given chemical reaction is

Li (s) + NaOH (aq) → LiOH(aq) + Na(s)

The oxidation state of Li is zero in the reactant side. The oxidation state of Na in the reactant side is 1. The oxidation state of Li in the product side is 1. The oxidation state of Na in reactant side is 0.

So the oxidation number of Na decreases from 1 to 0.

Thus from the above conclusion we can ay that The oxidation state of Na decreases from 1 to 0 in this reaction Li (s) + NaOH (aq) → LiOH(aq) + Na(s).

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Answee

the plant cells are placed in the salt solution, there is a higher concentration of water molecules in the cell and a lower concentration of water in the salt solution and thus a concentration gradient has been set up. the cell membrane is now pressed up against the cell wall and the cell is said to be turgid.

Answer:

i don't know

Explanation:

Answer:

Explanation:

Lithium is the first element in the second period. The second period has a total number of eight elements in all. The number of electrons in a lithium atom is 3.

The electronic configuration of lithium is 1s²2s¹. Lithium has just a single electron in its outermost shell.

Moving from left to right across the second period, the number of electrons in the outermost shell of the elements increases till it reaches the octet i.e 8:

   Be (4) : 1s²2s²

   B (5): 1s²2s²2p¹

   C (6): 1s²2s²2p²

   N (7): 1s²2s²2p³

   O(8): 1s²2s²2p⁴

   F (9): 1s²2s²2p⁵

   Ne(10): 1s²2s²2p⁶

As you go from left to right, the number of valence electrons increases by 1.

From left to right, the number of shell remains fairly constant. Li and Be has one electronic shell each while the rest of the elements in the period have two shells.

As we move from lithium to neon in the periodic table, the elements gain one electron each. Hence, their electron configuration increases sequentially, in line with their increasing atomic number.

When starting with lithium and proceeding to neon across the second period of the periodic table, the atomic number increases from 3 to 10. The atomic number corresponds to the number of protons, which also equals the number of electrons in an atom for a neutral element. Accordingly, as we move from left to right, one observes an increase in the electron configuration, with each subsequent element gaining an additional electron. For instance, the electron configuration of lithium is 1s2 2s1, that of beryllium (the next element) is 1s2 2s2, and so on, till we reach neon with a configuration of 1s2 2s2 2p6. Hence, the number of electrons (and hence electron configuration) increases as we move from lithium to neon.

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Answer:

The answer is C

Explanation:

"The general structure and physical properties of the interior of the earth are inferred through the analysis of seismic waves." This is quoted from what I am currently learning and if you were to do proper research it would tell you the same.

How it works.

"These waves are created by the energy released during earthquakes. The path of seismic waves through the earth is recorded by a world-wide network of seismographs which are located at earthquake monitoring facilities. The path of the seismic waves may be traced from an earthquake's epicenter  through the earth as they are received at numerous sites around the world. "Taken from my textbook.

carbon atoms can form chains thousands of atoms long.

Answer:

thousands

Explanation:

Carbon atoms can form chains thousands of atoms long.

Answer:

0.422 mol/L.

Explanation:

M = (no. of moles of glucose)/(volume of the solution (L))

M = (mass/molar mass)of glucose / (volume of the solution (L)).

∴ M = (mass/molar mass)of glucose / (volume of the solution (L)) = (289 g/342.2965 g/mol)/(2.0 L) = 0.422 mol/L.

Number of moles= mass/ molar mass

Or n=m/MM

n = number of moles

m = mass

MM = molar mass

1) n CuO = 2.4g / 79.54g/mol = 0.03 mol CuO

2) n Cu(NO3)2.xH2O = 7.26 g / 205.6 = 0.035 moles of Cu(NO3)2.xH2O

3) 205.6 g

Cu = 63.5 g

N = 14g

O =16g

H= 1 g

63.5+ (14+(16*3))*2+1*2+16 =205.6 g

4) yes is 188g

5) I don’t know, I assume was 1

1) The number of moles of CuO formed is 0.117 moles. 2) The number of moles of Cu(NO3)2.xH2O in the hydrate is 0.117 moles. 3) The mass of 1 mole of Cu(NO3)2.xH2O is 62 g. 4) The mass of 1 mole of Cu(NO3)2 is 188 g. 5) The value of x in the hydrate is -126 g/mol.

In order to answer the given questions, we need to first find the molar mass of Cu(NO3)2.xH2O. The molar mass of Cu(NO3)2 is 187.55 g/mol. To find x, we can subtract the molar mass of Cu(NO3)2 from the molar mass of Cu(NO3)2.xH2O. The molar mass of Cu(NO3)2.xH2O is 249.55 - 187.55 = 62 g/mol. Now we can answer the questions:

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Answer:

Explanation:

The given pH = 8.55

Unknown:

[H₃O⁺] = ?

[OH⁻] = ?

In order to find these unknowns we must first establish some relationship.

                      pH = -log[H₃O⁺]

                   8.55 = -log[H₃O⁺]

                    [H₃O⁺] = inverse log₁₀(-8.55) = 2.82 x 10⁻⁹moldm⁻³

To find the [OH⁻],

                     pH + pOH = 14

                               pOH = 14 - pH = 14 - 8.55

                                pOH = 5.45

              pOH = -log[OH⁻]

               [OH⁻] = inverse log₁₀ (-5.45) = 3.55 x 10⁻⁶moldm⁻³

The solution is basic because it has more concentration of OH⁻ ions compared to H⁺ ions.

Answer:119.38 g/mol

Explanation:

Add the Molar mass of each element to get the final answer. Use the Periodic table to find the molar mass. Molar mass is located under neath the elements.

Molecular mass of CHCl3 is 119.5 grams/mole

Molecular mass of CHCl3 = mass of Carbon+ mass of Hydrogen+ 3×(mass of Chlorine)

Molecular mass of CHCl3= 12+1+(3×35.5)= 119.5

Hence The Molecular mass of CHCl3 is 119.5 grams/ mole

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Answer:

D. The frictional force overcomes the force that binds the electrons to the atoms, enabling the electrons to move elsewhere

Explanation:

Neutral objects becomes charged by rubbing them together due to the frictional force which overcomes the attractive force holding electrons together in an atom.

Friction is the resistance to flow or movement. When we rub bodies together, the movement of electrons becomes inhibited and this can cause an orbital electron loosely held in an atom to be pulled off as the force of friction increases. This mechanism would result in a body losing electron and another readily gaining that electron as they interact. The loss and gain of electrons causes a neutral body to become charged.

Answer:

its D

Explanation:

Answer:

hypothesis

Explanation:

a question that can be answered wity a hypothesis is a question a scientist can answer

Science can answer questions that can be tested through observations and experiments. It relies on empirical evidence and the scientific method to provide explanations for natural phenomena. Scientific inquiries involve formulating hypotheses, conducting experiments, and analyzing results to draw conclusions.

The realm of science is vast, encompassing everything from the minuscule particles of physics to the vast complexities of biological ecosystems. The types of questions that science can answer are those that can be measured, tested, and observed. Whether it's understanding the laws of physics, exploring chemical reactions, or uncovering the intricacies of living organisms, science seeks to provide concrete explanations based on systematic studies. In essence, science is equipped to answer questions that have the potential for empirical verification and reproducible results. It's this empirical nature that sets scientific knowledge apart from other forms of understanding. However, there are questions that science may not be able to answer, such as those rooted in personal beliefs, morals, and the supernatural, as these cannot be observed or measured in the same way.

Answer:

Grahm's law of diffusion states that the rate of diffusion of a gas is inversely proportional to the square root of the mass of its particles.

Molecular weight of NO2 = 46 g mol¹-

Molecular weight of CO2 = 44g mol¹-

Thus the compound which has a lower molecular mass will diffuse at a faster rate than the heavier compound. In this case, the molecular mass of NO2 is more than the CO2 so, NO2 will diffuse at a slower rate than the CO2 molecule.

Answer:

The specific heat of the unknown substance is 1.22 J/g.°C.

Explanation:

Heat lost by substance (Qc) = Heat gained by the water (Qw) ,

- (Qc) = (Qw).

Qw = m.c.ΔT,

where, Qw is the amount of heat released to water (Q = ??? J).

m is the mass of water (m = 110.0 g).

c is the specific heat capacity of solution (c = 4.18 J/g.°C).

ΔT is the difference in T (ΔT = final temperature - initial temperature = 32.4°C - 24.2°C = 8.2°C).

∴ Q = m.c.ΔT = (110.0 g)(4.18 J/g.°C)(8.2°C) = 3770.36 J.

(Qc) = m.c.ΔT,

where, Qc is the amount of heat lost by substance (Qc = - 3770.36 J).

m is the mass of water (m = 42.5 g).

c is the specific heat capacity of solution (c = ??? J/g.°C).

ΔT is the difference in T (ΔT = final temperature - initial temperature = 32.4°C - 105.0°C = -72.6°C).

∴ (- 3770.36 J) = (42.5 g)(c)(-72.6°C).

∴ c = (- 3770.36 J)/(42.5 g)(-72.6°C) = 1.222 J/g.°C.

Answer:

[tex]\boxed{\text{Roughly a million times greater}}.[/tex]

Explanation:

For example, the energy released in burning 1 mol of octane, a component of gasoline, is about 5000 kJ.

The energy released in the fission of 1 mol of uranium-235 is

about 1.5 × 10¹⁰ kJ .

The ratio is  

[tex]\dfrac{1.5 \times 10^{10} }{5000} \approx 3 \times 10^{6}\\\\\text{The energy released by nuclear reactions is } \boxed{\textbf{roughly a million times greater}}\\\text{ than that released during chemical reactions.}[/tex]

The energy released during chemical reactions is much greater than the energy released per mole of reactant during nuclear reactions.

A nuclear reaction can be defined as a type of reaction in which the nucleus of an atom of a radioactive element is transformed by being joined (fusion) or split (fission) with the nucleus of another atom and it is accompanied by the release of great amount if energy.

A chemical reaction refers to a chemical process that involves the continuous transformation (rearrangement) of the ionic, atomic or molecular structure of a chemical element by breaking down and forming chemical bonds, in order to produce a new chemical compound.

In conclusion, the energy released per mole of reactant during chemical reactions is much greater than the energy released per mole of reactant during nuclear reactions.

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Answer:

chlorination

Explanation:

Answer: chlorination

Explanation: DDT is made from the

of unsaturated hydrocarbons.

Answer:

Rate = (0.64 M²/min) [A]¹[B]²

Explanation:

1) Determination of the orders of A & B:

The rate law of the reaction = k [A]ᵃ[B]ᵇ

where, k is the rate law constant,

a is the order of the reaction with respect to reactant A,

b is the order of the reaction with respect to reactant B.

This is initial rate method problem:

From trial 1 & 2:

Reactant [A] has the same concentration in both trials, but [B] has different concentrations and the rate of the reaction changes, so the reaction rate depends on [B].

From trial 1, Rate₁ = k [A₁]ᵃ[B₁]ᵇ, [1.2 × 10⁻² M/min] = k [0.30 M]ᵃ[0.25 M]ᵇ

From trial 2, Rate₂ = k [A₂]ᵃ[B₂]ᵇ, [4.8 × 10⁻² M/min] = k [0.30 M]ᵃ[0.50 M]ᵇ

By dividing Rate₁ / Rate₂:

Rate₁ / Rate₂ = k [A₁]ᵃ[B₁]ᵇ / k [A₂]ᵃ[B₂]ᵇ

[1.2 × 10⁻² M/min] / [4.8 × 10⁻² M/min] = k [0.30 M]ᵃ[0.25]ᵇ / k [0.30 M]ᵃ[0.50 M]ᵇ

0.25 = [0.50]ᵇ

Taking log for both sides; log(0.25) = b log(0.5)

b = log(0.25) / log(0.5) = 2.

The reaction is second order with respect to reactant B.

By the same way for reactant A:

From trial 2 & 3:

Reactant [B] has the same concentration in both trials, but [A] has different concentrations and the rate of the reaction changes, so the reaction rate depends on [A].

From trial 2, Rate₂ = k [A₂]ᵃ[B₂]ᵇ, [4.8 × 10⁻² M/min] = k [0.30 M]ᵃ[0.50 M]ᵇ

From trial 2, Rate₃ = k [A₃]ᵃ[B₃]ᵇ, [9.6 × 10⁻² M/min] = k [0.60 M]ᵃ[0.50 M]ᵇ

By dividing Rate₂ / Rate₃:

Rate₂ / Rate₃ = k [A₂]ᵃ[B₂]ᵇ / k [A₃]ᵃ[B₃]ᵇ

[4.8 × 10⁻² M/min] / [9.6 × 10⁻² M/min] = k [0.30 M]ᵃ[0.50 M]ᵇ / k [0.60 M]ᵃ[0.50 M]ᵇ

0.50 = [0.50]ᵃ

Taking log for both sides; log(0.50) = a log(0.5)

a = log(0.50) / log(0.50) = 1.

The reaction is first order with respect to reactant A.

The rate law of the reaction will be: Rate = k [A]¹[B]²

The overall order of the reaction is third order reaction.

2) Determining the rate law constant:

Taking data of trial 1:

Rate = k [A]¹[B]²

[1.2 × 10⁻² M/min] = k [0.30 M]¹[0.25 M]²

k = [1.2 × 10⁻² M/min] / [0.30 M]¹[0.25 M]² = 0.64 M²/min.

So, the rate law will be: Rate = (0.64 M²/min) [A]¹[B]²

Answer:  Very big number

Explanation:

wow

Answer:

Explanation:

The Electronic Configuration of the elements is the arrangement of all electrons of an element in energy levels and sub-levels (orbitals).  

There are 7 energy levels, numbered from 1 to 7, and in which electrons are distributed, logically in order according to their energy level. Each level is divided into sub-levels. These sub-levels into which each level is divided can be up to 4, called: s, p, d, f. In the sub-level s there can only be a maximum of 2 electrons, in p there can be a maximum of 6 electrons, in the sub-level d 10 electrons and finally in the sub-level f there can be a maximum of 14 electrons.

In level 1 there is only one sub-level, which will be the s. In level 2 there are 2 sub-levels, the s and the p. At level 3 there are 3 sub-levels s, p and d. And at level 4 there are 4 sub-levels, the s, the p, the d and the f.

Aufbau's principle is a principle of atomic physics, which explains how electrons are accommodated in their orbits around the nucleus of the atom. This principle states that the filling of these orbitals occurs in increasing order of energy, that is, from the orbitals of lower energy to those of higher energy.

The simplest of the sub-levels is 1s. If you fill the 1s you can start filling the 2s. After the 2s sub-level is satisfied, the 2p can begin to fill and so on.  

The atomic number Z of the element represents the number of protons of the element, and in a neutral atom it also indicates the number of electrons.  

So, given that the atomic number of the phosphorus is 15, and everything that has been said before, it is possible to say that the electrons that it has in the orbitals will be placed as follows:

1s² 2s² 2p⁶ 3s² 3p³

Finally, the orbital configuration of the phosphorus atom (P) will be as the image shows.

The orbital configuration of the phosphorus (p) atom is attached to the image below.

The phosphorus (P) atom has an atomic number of 15, which means it has 15 electrons. The electron configuration of phosphorus can be determined by filling up the orbitals according to the Aufbau principle and the Pauli exclusion principle.

1s² 2s² 2p⁶ 3s² 3p³, this electron configuration represents the distribution of electrons in the atomic orbitals of a phosphorus atom. The numbers represent the principal quantum numbers (n) and the letters represent the azimuthal quantum numbers (s, p). The superscripts indicate the number of electrons occupying each orbital.

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Answer:

[tex]\boxed{ \text{0.75 mol}}[/tex]

Explanation:

(a) Balanced equation

2NaBH₄ + H₂SO₄ ⟶ 2H₂ + Na₂SO₄ + B₂H₆

(b) Calculation

You want to convert moles of NaBH₄ to moles of B₂H₆

The molar ratio is 1 mol B₂H₆:2 mol NaBH₄

[tex]\text{Moles of B$_{2}$H$_{6}$} =\text{1.5 mol NaBH$_{4}$} \times \dfrac{\text{1 mol B$_{2}$H$_{6}$}}{\text{2 mol NaBH$_{4}$}} = \textbf{0.75 mol B$_{2}$H$_{6}$}\\\\\text{The reaction will produce }\boxed{ \textbf{0.75 mol of B$_{2}$H$_{6}$}}[/tex]

Answer:

Approximately 1.9 kilograms of this rock.

Explanation:

Relative atomic mass data from a modern periodic table:

To answer this question, start by finding the mass of Pb in each kilogram of this rock.

89% of the rock is [tex]\rm PbS[/tex]. There will be 890 grams of [tex]\rm PbS[/tex] in one kilogram of this rock.

Formula mass of [tex]\rm PbS[/tex]:

[tex]M(\mathrm{PbS}) = 207.2 + 32.06 = 239.26\; g\cdot mol^{-1}[/tex].

How many moles of [tex]\rm PbS[/tex] formula units in that 890 grams of [tex]\rm PbS[/tex]?

[tex]\displaystyle n = \frac{m}{M} = \rm \frac{890}{239.26} = 3.71980\; mol[/tex].

There's one mole of [tex]\rm Pb[/tex] in each mole of [tex]\rm PbS[/tex]. There are thus [tex]\rm 3.71980\; mol[/tex] of [tex]\rm Pb[/tex] in one kilogram of this rock.

What will be the mass of that [tex]\rm 3.71980\; mol[/tex] of [tex]\rm Pb[/tex]?

[tex]m(\mathrm{Pb}) = n(\mathrm{Pb}) \cdot M(\mathrm{Pb}) = \rm 3.71980 \times 207.2 = 770.743\; g = 0.770743\; kg[/tex].

In other words, the [tex]\rm PbS[/tex] in 1 kilogram of this rock contains [tex]\rm 0.770743\; kg[/tex] of lead [tex]\rm Pb[/tex].

How many kilograms of the rock will contain enough [tex]\rm PbS[/tex] to provide 1.5 kilogram of [tex]\rm Pb[/tex]?

[tex]\displaystyle \frac{1.5}{0.770743} \approx \rm 1.9\; kg[/tex].

Answer:

Explanation:

Reaction rate is a measure of the speed of a chemical reaction. There are many theories that have been put forward to explain reaction rates. One of which is the collision theory.

The collision theory postulates that for a reaction to occur, there must be collisions between reacting particles. This implies that the number of successful or effective collision of particles determines the rate of a chemical reaction. For a collision to be successful, the particles must be properly oriented and equiped with adequate energy for the reaction.

One of the key component of the energy required for effective collision is temeperature. The  number of effective collision and consequently the rate of chemical reactions are directly proportional to the temperature at which the reaction occurs. With increasing temperature, the activation energy becomes activated and the number of collision increases.

Answer:

Na₂CO₃.

Explanation:

The compound that has a common ion effect is Na₂CO₃.

Answer:

Na2Co3

Explanation:

Answer:

See below.

Explanation:

That is because  of the .48.

85.48 is closer to 85 than 86.

Answer:

Ionic or electrovalent bonds

Explanation:

Ionic or electrovalent bonds are interatomic or intramolecular bonds which are formed between two kinds of atoms having a large electronegativity difference usually 2.1.

Electronegativity is the property that combines the ability of an atom to gain or lose electrons. It is expressed as the tendency with which atoms of elements attracts valence electrons in a chemical bond.

In this bond type, a metal transfers its electrons to a more electronegative atom which is a non-metal.

The answer is: a. ionic bonding.

Ionic bond is the electrostatic attraction between oppositely charged ions (cations and anions).  

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For example, compound magnesium chloride (MgCl₂) has ionic bond.  

In this example, chlorine is large company, because it has greater electronegativity than magnesium (small company) and take electrons (assets) from it.

Magnesium (Mg) transfers two electrons, became positive cation, to chlorine (Cl), which became negative anion.  

Magnesium is metal from group 2 and chlorine is nonmetal from group 17 of the Periodic table.  

Electronegativity (χ) is a property that describes the tendency of an atom to attract a shared pair of electrons.

They have small differences in electronegativity

i think thats right

Answer:

C.) They have small differences in electronegativity

Answer:

cell wall

chloroplasts

central vacuole

Explanation:

Plant cells have a cell wall, chloroplasts, and a central vacuole. These structures are not found in animal cells.

The structures of three cells present in the cells in plant, but not animal cell are Cell wall, Chloroplast and Plastids.

Animal cell only contain cell membrane whereas plant cell has both cell wall and cell membrane. Unlike animal cell, plant cell makes their own food. The plants come under autotrophs and animals come under heterotrophs.

For this purpose, there is chloroplast in a plant cell. The major function of chloroplast is to produce food through photosynthesis. Plastids are the pigment containing cell organelles which is responsible for the color of plant cell.

Answer:

PCI3

Explanation:

PCI3 is a product in one reaction and a reactant in the other. This makes it an intermediate as it is produced then used up in the same series of reactions.

Answer: C. PCI3

Explanation:

Answer:

CH₄(g) + 2O₂(g) → CO₂(g) + 2H₂O(l).

Explanation:

CH₄(g) + 2O₂(g) → CO₂(g) + 2H₂O(g)

2H₂O(g) → 2H₂O(l)

CH₄(g) + 2O₂(g) → CO₂(g) + 2H₂O(l).

Answer:  The reaction is Exothermic

CH4(g) + 2O2(g) > CO2(g) + 2H2O(g) + energy

Explanation: