Complete the following radioactive decay problem.
14 7 N+ 1 0 n – ?C+}н​

Explanation:

The law of conservation of mass states that the total mass of the products is equal to the total of the reactants.

A chemical change occurs because of a chemical reaction.

In a chemical reaction, the reactants are the starting substances and the products is the finishing substances. The amount of each type of atoms to start with and end with are also equal.

No matter disappears after a chemical reaction.

Answer:

The amount of matter in the new substances is the same as the original.

This is known as the law of conservation of mass.

Final answer:

In a chemical change, the law of conservation of matter indicates that the total amount of matter remains constant, with atoms being rearranged but not created or destroyed.

Explanation:

When a chemical change occurs, the amount of matter in the new substances remains unchanged according to the law of conservation of matter. This fundamental principle asserts that during any chemical reaction, matter is neither created nor destroyed. Instead, the atoms are simply rearranged to form new substances. Therefore, the number and type of atoms present after a chemical change are the same as those before the change took place.

The formation of new substances implies that one kind of matter is transformed into a different kind. Although the properties and appearance might change significantly, the total mass remains constant. For everyday chemical reactions, any mass changes are too negligible to measure, and thus the law holds true. However, in nuclear reactions, which involve changes to the nucleus of an atom, the energy changes can be significant enough to result in detectable mass changes. In such cases, the laws of conservation of matter and energy are considered in a combined way to reflect that the total quantity of matter and energy is fixed.

Answer:

Polyhydroxyl alcohols

Explanation:

Whenever we have several C-OH bonds, we have a polyhydroxyl alcohol. For example, if we have just one alcohol group, that is, an R-OH group, then the naming is simple, say, we have EtOH, it's ethanol.

The problem becomes more complicated when we have several hydroxyl groups present in the alcohol. Let's say we have an ethane molecule and we replace the hydrogen atoms of carbon 1 and 2 with hydroxyl groups. In that case, we have 1,2-ethanediol. Similarly, we can have triols etc.

That said, we have poly (several) hydroxyl groups and we can generalize this to having polyhydroxyl alcohols.

Answer:

Explanation:

Polyhydroxyl alcohols

Answer:

From the lemonade towards the ice

Explanation:

According to the second law of thermodynamics, heat spontaneously flows from hotter objects to colder objects.

In the context of this problem, we have lemonade at, say, room temperature, as well as ice at either equilibrium temperature at the freezing point of water (0 degrees Celsius) or below. This means that the lemonade here is hotter than the ice.

Based on the second law of thermodynamics, heat would flow from the lemonade (the hotter object) towards the ice (the colder object). This is the reason why ice melts: it gains heat from a hotter object and its temperature increases.

The percentage composition of the nitrogen in N₂H₄ is 87.5%

The percentage composition of an element in a compound can be obtained by using the following formula:

Percentage = [tex]\frac{mass of element }{mass of compound }[/tex] × 100

With the above formula, we can obtain the percentage composition by mass of nitrogen in N₂H₄ as illustrated below:

Molar mass of N₂H₄ = 32 g/mol

Mass of N in N₂H₄ = 2N = 2 × 14 = 28 g/mol

Percentage = [tex]\frac{mass of element }{mass of compound }[/tex] × 100

Percentage of nitrogen = [tex]\frac{28}{32}[/tex] × 100

Percentage of nitrogen = 0.875 × 100

Therefore, the percentage composition of the nitrogen in N₂H₄ is 87.5%

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The percent composition by mass of nitrogen in N2H4 is 87.56%.

To find the percent composition by mass of nitrogen in N2H4, we must perform the following calculations:

(28.02 g N / 32 g N2H4) × 100 = 87.56%

Therefore, the percent composition of nitrogen in N2H4 is 87.56%.

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Answer:

 121.76 °C

Explanation:

Data Given:

Boiling point of water = 100.0°C

Kb (boiling point constant = 0.512°C/m

Concentration of the Mg₃(PO₄)₂ = 8.5 m

Solution:

Formula Used to find out boiling point

               ΔTb = m.Kb.i . . . . . . (1)

where

ΔTb = boiling point elevation

m = concentration of solution

kb = molal boiling point elevation constant

i = Van't Hoff factor

Van't Hoff factor : It is the number of ions of ionic compound in the solution produced by it when it dissolve in solvent.

Van't Hoff factor for Mg₃(PO₄)₂:

Assuming ideal Van't Hoff factor Look for ionization of Mg₃(PO₄)₂ in solution

        Mg₃(PO₄)₂ ------> 3 Mg²⁺ + 2 PO₄³⁻

From above equation it is clear that it give total 5 ions in solution form upon dissolving i.e. 3 Mg²⁺ ions and 2 PO₄³⁻ ions.

So,

Van't Hoff factor = 5

Now

As,

       ΔTb = boiling point of solution - boiling point of water

So,

we can write equation 1 as under

               Tb (Solution) -Tb (water) = m.Kb.i

As we have to find out boiling point so rearrange the above equation

              Tb (Solution)  = (m . Kb . i)+ Tb (water) . . . . . . . (2)

Put values in Equation 2

            Tb (Solution)  = (8.5 m x 0.512°C/m x 5) + 100.0°C

            Tb (Solution)  = 21.76 °C + 100.0°C

            Tb (Solution)  = 121.76°C

so the boiling point of 8.5m Mg₃(PO₄)₂ solution =  121.76 °C

Answer:

In a chemical reaction, only the atoms present in the reactants can end up in the products. No new atoms are created, and no atoms are destroyed. In a chemical reaction, reactants contact each other, bonds between atoms in the reactants are broken, and atoms rearrange and form new bonds to make the products.

Explanation:

explanation is up there ^^

During a chemical reaction, the reactant molecules' chemical bonds are energetically influenced, resulting in the breaking and subsequent rearrangement to form product molecules with new chemical bonds. The best example of this is the reaction of hydrogen and oxygen to produce water, where the initial molecules' bonds are broken and rearranged to form water molecules.

The details of what actually takes place during a chemical reaction are a little complex, but fundamentally, it involves the breaking and forming of chemical bonds. During a chemical reaction, the molecules of the reactants are influenced energetically so their chemical bonds are broken and they subsequently rearrange to form product molecules with new chemical bonds. Let's take a simple example: the reaction between hydrogen and oxygen to yield water:

H₂ + O₂ → H₂O

In this reaction, the chemical bonds within the hydrogen and oxygen molecules are broken and new ones are formed to create a water molecule. This process results in the release of energy.

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Answer:

Becuse magnesium is a earth alkaline metal and oxygen is a nonmetal(read explanation)

Explanation:

Magnesium has 2 valence electrons where oxygen has 6 valence electrons. Magnesium has tendency to give electrons to oxygen and oxygen has tendency to gain electrons. They are both trying to complete their last shell to 8 which is called the octet rule. Because they both want to complete each other because of the reasons that I told they combine to be stanle atoms like noble gases.

Among the following, temperature is most directly related to the thermal energy. It is the energy acquired by body by the  absorption of heat.

Thermal energy is a form of energy  acquired by increasing the temperature of a body.  Thermal energy of a body is directly proportional to the temperature of the  body.

Kinetic energy is generated by virtue of motion of a body. Thus only a moving body will gain kinetic energy. For a moving body, as thermal energy increases, kinetic energy also increases.

Potential energy is generated by virtue of the position of an object which is in a height from the surface. The kinetic energy and potential energy together called as mechanical energy. They are related with the temperature.

However, the temperature is most directly related to thermal energy. Thus option D is correct.

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Answer:

The charges did not transfer from the cation to the anion to yield the correct subscripts

Explanation:

First of all, we see that we have [tex]Al^{3+}[/tex] and [tex]O^{2-}[/tex] in this ionic compound. Since this is a substance, it has a net charge of 0. This means the charge of a cation should be balanced by the charge of the anion.

The lowest common multiple of 3 and 2 is 6, meaning we need:

Oxygen needs a total of 8 valence electrons, as it's the anion and it gains electrons to obtain an octet. We have 3 oxygen anions in total. Normally, oxygen has 6 electrons, so it needs to gain 2 electrons for each of the 3 oxygen atoms, that is, gain a total of 6 electrons. Those 6 electrons are donated by two aluminum atoms (each having 3 valence electrons), so two aluminum cations are balanced by three oxygen anions.

The Lewis diagram is correct, as it shows an octet on oxygen. We also have the correct charges. The subscripts, though, have to be 2 and 3 for Al and O respectively.

Answer:

Symbols of elements

Explanation:

Symbols of elements corresponding to their names do not vary systematically in the periodic table. The only systematic variation might be an alphabetical order, either ascending or descending, but we don't see this trend in the periodic table.

The other properties, however, vary systematically:

Answer: the graph of Charles' law is a graph that passes through the origin in which as one variable increases, the other also increases and vice versa.

Explanation:

Answer: BeCl2

Explanation:

Be + Cl2 —> BeCl2

Answer:BeCl2

Explanation:

Reaction between Beryllium (Be) a di-ionic cation and Chlorine a mono-ionic forms BeCl2.

The ionic compound formed from lithium ions (Li+) and iodide ions (I-) is Lithium Iodide (LiI). This is an example of an ionic compound, which typically forms when a metal reacts with a nonmetal.

The ionic compound that consists of lithium ions (Li+) and iodide ions (I-) is called Lithium Iodide, denoted as LiI. In this compound, lithium is a metal and iodide is a nonmetal, making the compound ionic. The lithium atom donates an electron, forming a Li+ ion, and the iodine atom accepts an electron, forming an I- ion. Subsequently, the Li+ and I- ions attract each other due to their opposite charges, forming an ionic bond and yielding the ionic compound Lithium Iodide.

Lithium Iodide is just one example of an ionic compound. Ionic compounds typically form when a metal reacts with a nonmetal. Other examples can include sodium chloride (NaCl), and calcium chloride (CaCl2), where a transfer of electrons occurs, producing ions.

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Lithium iodide is the name of the ionic compound made up of lithium ions (Li+) and iodide ions (I-). The compound's formula is LiI. The name follows the standard naming convention for ionic compounds.

An ionic compound consisting of lithium ions (Li⁺) and iodide ions (I⁻) is known as lithium iodide. The metal cation name—in this case, lithium—should come first when naming ionic compounds. This is succeeded by the non-metal anion's name, iodine, with a modified '-ide' at the end. Iodine is therefore substituted with iodide.

This naming scheme makes the compound's ionic nature easier to identify. Iodide ions have a 1 charge, signifying that they have gained one electron, whereas lithium ions have a 1+ charge, signifying that they have lost one electron. With the help of their mutual attraction, these opposing charges balance one another out to create a neutral compound with the chemical formula LiI.

As a result, one lithium ion and one iodide ion form the compound lithium iodide, illustrating the basic ideas behind the synthesis and nomenclature of ionic compounds.

Answer:

Mass of aluminium in sample = 3.591 g ≅ 3.6 grams

Explanation:

Given that,  A sample of aluminum absorbs 50.1 J of heat, upon which the temperature of the sample increases from 20.0°C to 35.5°C.

the specific heat of aluminum is 0.900 J/g- °C

The relation between heat absorbed and change in temperature is given by,   Q = msΔT.

where Q = heat absorbed

            m = mass of the substance

            s = specific heat of substance

          ΔT  = change in temperature

Now, in our case, Q = 50.1 J ; s = 0.900 J/g- °C; ΔT= 35.5-20 = 15.5°C

⇒ m =  [tex]\frac{Q}{s(T_{2} -T_{1}) }[/tex]

⇒ m = [tex]\frac{50.1}{0.900(15.5)}[/tex] = 3.591 g ≅ 3.6 g

⇒ m ≅ 3.6 g

To calculate the mass of the aluminum sample, the heat absorbed was divided by the product of the specific heat capacity of aluminum and the change in temperature, resulting in a mass of approximately 3.59 grams.

To find the mass of the aluminum sample, we'll use the following specific heat formula:

Q = mcΔT

Where:

From the question:

Rearranging the formula to solve for mass (m), we get:

m = Q / (cΔT) = 50.1 J / (0.900 J/g°C × 15.5°C)

Calculating the mass of the aluminum gives us:

m = 50.1 J / (13.95 J/g) ≈ 3.59 grams

Answer and Explanation:

Definition of Terms

Lack of water availability is a natural situation that occurs where and when water becomes scarce and not readily available for use.

Possible Threats

Most of the threats caused b water lack of water availability are caused by human activities both necessary and unnecessary while others are caused by nature responding to some of those human activities. These threats include pollution, change of landscape, urban growth, deforestation and climate change.

How to reverse these threats

Implementing adequate hydrologically-based water assessment and management processes:

Landscape changes which are inevitable, are of different types and therefore poses different specific impact on the ecosystems directly or on water availability indirectly. The strength of the impacts will vary with a wide range of possible landscape changes depending the settings conditions. For this reason, it is imperative that for certain parts of the world where the threat of water availability is experienced that adequate hydrologically-based water assessment and management processes be implemented.

Developing optimum, scalable and energy efficient plants for desalination:

For man ears desalination has helped solved lack of water availability in certain parts of the world, but these desalination plants are energy-intensive. However, with newer technologies, these plants would require less energy and when utilized would reverse the threats posed by lack of water availability.

Innovative water catchment and harvesting:

Water catchment systems are imperative for areas with lack of water availability in order to store more waters as gotten from other sources where it is readily available, whilst also recycling the waste waters in those areas too.

Better policies and regulations while educating the masses:

Lack of water availability would affect food security and even cause pollution, therefore the government would need to make better policies and regulations guiding the use of water whilst educating the masses on the need to change their water consumption and lifestyles. And this is easily done when the water available is appropriately priced.

Holistic Ecosystem management:

This type of management means taking into account the ecological, economic and cultural goals that affects the country's natural resources, and this approach has to be holistic, logical and practical. Why holistic approach? Simply because each aspect is related to and influenced by the others.

Improved Distribution Infrastructure:

Poor infrastructure poses threats to health and even the nations economy. The infrastructural system in place for waver distribution must be of good quality and constantly checked and maintained.

The above stated approach would reverse lack of water availability in any nation.

Answer: (a)

Decrease of two in atomic number and a decrease of four in mass number

Explanation:

The effect on the nucleus of an atom if it emitted one alpha particle and one gamma ray is:

Alpha (α) particles are like He+2 nucleus which has 2 protons and 2 neutrons. Thus after emitting α particles there will be decrease of atomic number by 2 and mass number will be decreased by 4. And the emission of gamma ray does not produce effect on the number of protons and neutrons.

Answer:

The answer in the comments is wrong! It's not even an option on the test. Just letting people know.

Explanation:

Answer:

3) increase in the average temperature of Earth

Explanation:

Coronal mass ejections or CME is the phenomena described as "Scientists have observed huge bubbles of gas ejecting from the sun". Whilst CMEs can happen alongside solar flares, it is also important to know that they can occur by themselves (independently). Solar flares refers to the abrupt release of energy kept in twisted magnetic fields caused by explosions on the Sun.

When these solar flares hit the earth, the gases (gas molecules) in the upper atmosphere such as nitrogen and water vapor are broken up and freed. This new gases then react with molecules in the ozone layer and reduce its layer. Consequently, the result is that there is increase in the average temperature of Earth.

Hence, option 3 is the event most likely to occur due to this solar condition

Answer:

C.  increase in the average temperature of Earth

Explanation:

Answer:

Molarity = 0.01 M

Explanation:

Molarity is used to measure the concentration of a solution. It will be same for the whole solution or a small amount of solution if the solution is homogeneous.

So, Molarity of 200 mL of solution = Molarity of 50 mL of solution

[tex]\mathbf{Molarity = \frac{number \ of \ moles \ of \ solute}{Volume \ of \ solution \ (in \ liters)}}[/tex]

[tex]\mathbf{Moles = \frac{given \ mass \ of \ compound}{molar \ mass \ of \ compound}}[/tex]

given mass of aspirin = 360 mg = 0.36 g

molar mass of aspirin = 180 g

Volume of solution = 200 mL = 0.2 L

[tex]\mathrm{Mole \ of \ Aspirin = \frac{0.36}{180} = \mathbf{0.002 \ moles}}[/tex]

[tex]\mathrm{Molarity = \frac{0.002}{0.2} = \mathbf{0.01 \ M}}[/tex]

Therefore, Molarity = 0.01 M

50. mL of a sample prepared by dissolving 360. mg of aspirin in 200. mL of solution, has a molarity of 0.0100 M.

First, we will convert 360. mg (0.360 g) to moles of aspirin using its molar mass (180. g/mol).

[tex]0.360 g \times \frac{1mol}{180. g} = 2.00 \times 10^{-3} mol[/tex]

2.00 × 10⁻³ moles of aspirin are dissolved in 200. mL (0.200 L) of solution. The molarity of the solution is:

[tex]M = \frac{2.00 \times 10^{-3} mol}{0.200 L} = 0.0100 M[/tex]

The molarity is an intrinsic property, so a 50. mL sample will have the same molarity as the 200. mL solution.

50. mL of a sample prepared by dissolving 360. mg of aspirin in 200. mL of solution, has a molarity of 0.0100 M.

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Question:

1. (NH)2CrO

a) Number of moles of H:

b) Number of moles of N:

Answer:

a) Number of moles of H: 2

b) Number of moles of N: 2

Explanation:

The  [tex](NH)_2CrO[/tex] is ammonium Chromate which is monoclinic and yellow Crystal that is formed due to the reaction of ammonium Hydroxide and ammonium di-chromate. It is used as catalyst, corrosion inhibitor as well as analytical inhibitors.

Question:

2. Ag.SO.

a) Molar Mass:

b) Percent Composition of Ag:

c) Percent Composition of S:

d) Percent Composition of O:​

Answer:

a) Molar Mass:   155.93 Kg

b) Percent Composition of Ag:   69%

c) Percent Composition of S:  20.5%

d) Percent Composition of O:​ 10.2%

Explanation:

Molar mass =   molar mass of Ag +  molar mass of S +  molar mass of O  

=>107.87+32.06+16

=> 155.93 Kg

Percent Composition of Ag

= [tex]\frac{ \text{mass due  to Ag}}{\text {total molar mass}}  \times 100[/tex]

= [tex]\frac{107.87}{155.93} \times 100[/tex]

= 0.69 \times 100

= 69%

Percent Composition of S:

= [tex]\frac{ \text{mass due  to S}}{\text {total molar mass}}  \times 100[/tex]

=[tex]\frac{32.06}{155.93} \times 100[/tex]

= 0.205 \times 100

= 20.5%

Percent Composition of O:

= [tex]\frac{ \text{mass due  to O}}{\text {total molar mass}}  \times 100[/tex]

= [tex]\frac{16.00}{155.93} \times 100[/tex]

= 0.102 \times 100

= 10.2%

Answer:

The P6 block of the periodic table is the block that belong to the noble gases. The noble gases in P6 block are: Helium, neon, argon, krypton, xenon and radon

Explanation:

P-block elements in periodic table is non-metals. The elements which belongs to p⁶ block are noble gases, i.e., helium, neon, argon, krypton, xenon and radon.

Nobel gases are inert gases having completely filled orbitals. Hence they are normally unreactive. Noble gases are non-metals and exists in gaseous state.

Noble gases are termed as p⁶ elements because, their valence p orbital is  completely filled by 6 electrons.  Therefore the noble gases helium, neon, argon, krypton, xenon and radon are termed as p⁶ block elements.

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Answer:

0.09639M

Explanation:

Step 1:

The balanced equation for the reaction. This is given below:

H2SO4 + 2KOH —> K2SO4 + 2H2

The following were obtained from the balanced equation

Mole of the acid (nA) = 1

Mole of the base (nB) = 2

Step 2:

Data obtained from the question. This includes:

Concentration of acid (Ca) =?

Volume of acid (Va) = 15mL

Concentration of base (Cb) = 0.09886M

Volume of base (Vb) = 29.25mL

Step 3:

Determination of the concentration of the acid.

Applying the equation:

CaVa/CbVb = nA/nB

The concentration of the acid can be obtained as follow:

CaVa/CbVb = nA/nB

Ca x 15 / 0.09886 x 29.25 = 1/2

Cross multiply to express in linear form

Ca x 15 x 2 = 0.09886 x 29.25 x 1

Divide both side by 15 x 2

Ca = (0.09886 x 29.25) / (15 x 2)

Ca = 0.09639M

Therefore, the concentration of the acid is 0.09639M

Answer:

0.09639 M acid

Explanation:

Answer:

C) 1,605.1kJ

Explanation:

Combustion of methane (CH4) is known to be an exothermic reaction. 802.3kJ/mol CH4 (50.1kJ/g) of heat is released during combustion.

If 2 mol of CH4 is combusted

2 × 802.3kJ = 1,604.6kJ of heat is released

1,604.6 ≈ 1605.1kJ

Answer:

"The earthquake shakes the position of land" is the most common way an earthquake changes Earth's land forms

Explanation:

Most of the times earthquake has been found to be making drastic reforms over the surface. With respect to the movement of ground other surface effects includes variation in the flow of groundwater, landslides and also in the direction flow change of mudflow. It affects the buildings, bridges, pipelines and railways and other important structures. the ground movement takes place due to the movement of underground rocks which found to be breaking near the faults. This release energy that further leads to movement of the tectonic plates. The generation of seismic wave from the energy.  

Answer:

because its water

Explanation:

Answer:

Hydrogen has one valence electron, Atoms may share electrons in order to fill their electron shells, Oxygen has two vacancies in its electron shell, but carbon has four vacancies.

Explanation:

i jus did it on study island :P

Answer:

C. Hydrogen is the limiting reactant

Explanation:

Mole ratios are determined using the coefficients of the substances in the balanced chemical equation of reaction.

H2 + Cl2 -----> 2HCl

1mol:1mol 2mol

1mol of H2 reacts with 1 mole Cl2 to produce 2 moles of HCl.

From the above question, the amount of moles for H2 and for Cl2 are given as well as the amount of HCl each will produce.

We know the following now:

•1 mole of H2 gives 2 moles of HCl. •Thus, 4 molecules of H2 will produce 8 molecules of HCl.

•4 molecules of Cl2 will also produce 8 molecules of HCl.

•Likewise, 6 molecules of Cl2 will produce 12 molecules of HCl

•6 molecules of H2 will also produce 12 molecules of HCl BUT we do not have 6 molecules of H2!! We have only 4!! (From the question) .

This makes us short of H2 molecules. That is, the amount of H2 is in limited supply, which makes H2 the limiting reactant while Cl2 is in excess.

Therefore, we can only make 8 moles of HCl instead of 12 moles.

The best statement which describes the role of hydrogen in this chemical reaction is that hydrogen is the limiting reactant.

Answer:

C) the reactant in excess produces the greatest amount of product.

Explanation:

The statement that is NOT true is that the reactant in excess produce the greatest amount of product. The key to production is the limiting reactant. Reactants in excess have nothing to react with!

4)

Under the kinetic-molecular theory of gases, one important assumption about the properties of an ideal gas is that the collision between gas molecules is perfectly elastic. This means that during collisions, there is no net loss or gain of kinetic energy. The gas molecules simply exchange energy, changing direction and speed, but the total energy of the system remains constant.

This assumption is crucial in understanding the behavior of ideal gases because it helps explain various gas properties, such as the relationship between pressure, volume, and temperature. The perfectly elastic collisions allow the gas molecules to freely move and exert pressure on the walls of the container.

5)

To convert degrees Celsius to Kelvin, you simply add 273.15 to the temperature in Celsius.

In this case, to convert 34 degrees Celsius to Kelvin, you would add 273.15:

34 degrees Celsius + 273.15 = 307.15 Kelvin

Therefore, the temperature expressed as Kelvin is 307 Kelvin.

Answer: put 2 in front of NaOH and 2 also in front of H2O

Explanation: 2NaOH + H2CO3 —> Na2CO3 + 2H2O

Answer:

c : 13%

Explanation:

Data Give:

Experimental density of vanadium = 6.9 g/cm³

percent error = ?

Solution:

Formula used to calculate % error

  % error = [experimental value -accepted value/accepted value] x 100

The reported accepted density value for vanadium = 6.11 g/cm³

Put value in the above equation

                  % error = [ 6.9 - 6.11 / 6.11 ] x 100

                  % error = [ 0.79 / 6.11 ] x 100

                  % error = [ 0.129] x 100

                  % error = 12.9

Round to the 2 significant figure

% error = 13 %

So, option c is correct