Question 14 of 25
For a certain chemical reaction, the reactants contain 52 kJ of potential
energy, and the products contain 32 kJ. How much energy is absorbed or
released by the reaction?
OA. 20 kJ is released.
о B. 84 kJ is relesed.
OC. 84 kJ is absorbed.
OD. 20 kJ is absorbed.
SUBMIT

Answer:

When a piece of iron that is 25 °C is dropped into water that is 15 °C, the heat from the iron will dissipate into the water until the temperature is the same by conduction. Thus, option A is correct.

What is conduction?

Conduction is the transfer of the dissipated energy from the hot iron metal at 25 °C to the water at a lower temperature. The heat or the energy molecules gets transferred from the region of high to lower temperature.

This occurs through the diffusion that allows the hot iron to release the energy from its body that diffuses and gets transferred to the water molecules that have a tempearture of 15 °C, which is lower than that of the iron.

Therefore, the piece of the iron loses its heat to the water till both have the same tempearture.

If a less concentrated initial solution of sodium bicarbonate was used in beaker C, it would require more bicarbonate to neutralize the acid.

Concentrated means something that has been increased in strength or power by reducing its volume. It can refer to a solution that has a higher concentration of solutes than the original solution, a sound that is louder or stronger, or a force that is more powerful or intense. Concentrated can also refer to a person’s focus or attention on one particular thing, when their thoughts and energy are directed to a single point.

This is because the concentration of sodium bicarbonate determines how much of the acid can be neutralized by the solution. If the initial solution is less concentrated, then it will take more of the bicarbonate to neutralize the same amount of acid.

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Answer: pH of the solution is 5.47

Explanation: Since HNO3 is a strong acid the concentration of H+ is the same as NO3- only because they are in 1-to-1 ratio. Both ions will have 3.4 x 10^-6 M.

The formula of pH is: pH = -log( the equilibrium concentration of H+ )

When you plug in the concentration of H+:

pH = -log (3.4 x 10^.6 M)

pH = 5.47

Remember: Only the digits after the decimal point are significant figures in logarithms.

For example: 5.47 only has 2 significant figures.

Answer:

1) Nuclear energy is a non-renewable resource because it relies on uranium to generate power. Uranium is a radioactive element not found in large quantities on Earth. Once it is used to fuel a nuclear reactor, it cannot be reused. This means that once all the uranium is gone, we will no longer be able to generate nuclear power.

2)

Wind power pros and cons

    2. Cons

Coal power pros and cons

     1. Pros

     2. Cons

Answer:

Gas pressure= 766.4 mmHg

Explanation:

Gas pressure greater than atmospheric pressure = Atmospheric pressure + height

750.0 mmHg + 26.4 cm = 766.4 mmHg

The rate constant value for the given reaction is  1.8×10⁻⁵.  The chemical kinetics rate law, which connects the molecular concentration of reactants with reaction rate

The chemical kinetics rate law, which connects the molecular concentration of reactants with reaction rate, uses the rate constant as a proportionality factor. The letter k in an equation designates it, which is also referred by the term the reaction constant of rate and reaction rate coefficient.

2SO[tex]_2[/tex](g) + O[tex]_2[/tex](g) →2SO[tex]_3[/tex](g)

Keq = [SO[tex]_3[/tex]]² / ([SO[tex]_2[/tex]]² [ O[tex]_2[/tex]])

       = [3.50]² / ([1.50]² [ 1.25)

      =   1.8×10⁻⁵    

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The mechanism is: Step 1: Protonation of carbonyl group, Step : Formation of enol intermediate, Step 3: Nucleophilic attack by benzaldehyde, Step 4: Proton transfer, Step 5: Rearrangement, 

The overall reaction can be represented as: Acetophenone + Benzaldehyde → Aldol intermediate → α,β-unsaturated ketone + H₂O. The acid catalyst (such as HCl or H₂SO₄) protonates the carbonyl group of the acetophenone, making it more susceptible to nucleophilic attack by the benzaldehyde, then protonated acetophenone then loses a water molecule to form an enol intermediate. The enol intermediate acts as a nucleophile and attacks the carbonyl group of the benzaldehyde, forming a new carbon-carbon bond.

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Answer:

109.5º

Explanation:

The leftmost carbon has four bonds and no lone pairs attached to it. According to the VSEPR model, this carbon has a tetrahedral geometry. Thus, each bond angle is 109.5º

1. C) Molarity is indirectly related to volume.

2. A) The CaCl2 beaker has more ions in solution.

3. the molarity of the NaCl solution is 0.0513 M.

Step 1: Convert 30g of NaCl to moles.

The molar mass of NaCl is 58.44 g/mol. To convert 30 g to moles, divide by the molar mass:

30 g NaCl / 58.44 g/mol = 0.513 mol NaCl

Step 2: List Given and asking information.

Given:

Mass of NaCl = 30g

Volume of solution = 10.0L

Asking:

Molarity of the solution = ?

Step 3: set Molarity Formula and plug the mole/ Volume into the formula.

Molarity = moles of solute / volume of solution

Molarity = 0.513 mol / 10.0 L = 0.0513 M

Therefore, the molarity of the NaCl solution is 0.0513 M.

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Weathering processes, both physical and chemical, break down rocks into smaller particles that mix with organic matter to form soil. Physical weathering, such as freeze-thaw cycles, root growth, and abrasion, mechanically break rocks into smaller fragments.

Chemical weathering, such as oxidation, dissolution, and hydrolysis, alters the mineral composition of rocks and releases nutrients for plant growth. The products of weathering, such as clay minerals and soluble salts, affect soil properties like texture, structure, porosity, and nutrient availability. Weathering also affects the pH of soil, which influences the solubility and availability of nutrients. Overall, weathering plays a critical role in soil formation and the availability of nutrients for plant growth.

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--The complete Question is, How does the process of weathering, such as the physical and chemical breakdown of rocks, affect the composition and properties of soil?--

The number of grams in the specified moles for each compounds are;

1. Dinitrogen Pentoxide would be 1328.523 g

2. Iron (III) Nitrate = 653.076 g

3.   Sucrose (C12H22O11) = 54.7744 g

4. Potassium Iodide (KI) = 144.42 g

1. The molar mass of N2O5 = (2 × atomic mass of N) + (5 × atomic mass of O)

(2×14.01 g/mol) + (5 × 16.00 g/mol)

= 28.01 g/mol + 80.00 g/mol

Molar mass of N2O5 = 108.01 g/mol

12.3 moles× 108.01 g/mol = 1328.523

2. The molar mass of Fe(NO3)3 = atomic mass of Fe + 3 × (atomic mass of N + 3 × atomic mass of O)

(55.85 g/mol) + 3 × (14.01 g/mol) + 3 × (16.00 g/mol))

Molar mass of Fe(NO3)3 = 241.88 g/mol

2.7 moles × 241.88 g/mol = 653.076 g

3. Sucrose (C12H22O11):

The molar mass of C12H22O11 = (12×atomic mass of C) + (22×atomic mass of H) + (11 × atomic mass of O)

= (12×12.01 g/mol) + (22 × 1.01 g/mol) + (11 × 16.00 g/mol)

= 144.12 g/mol + 22.22 g/mol + 176.00 g/mol

= 342.34 g/mol

0.16 moles × 342.30 g/mol = 54.7744 g

4. Potassium Iodide (KI):

The molar mass of KI = atomic mass of K + atomic mass of I

= (39.10 g/mol) + (126.90 g/mol)

= 166.00 g/mol

So, 0.87 moles of KI = 0.87 moles × 166.00 g/mol = 144.42 grams

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A flare would be seen in visible light even though they are much brighter in x-ray and ultraviolet light because (D) The telescopes need to be in space in order to observe x-ray and ultraviolet light.

When the Sun's powerful magnetic fields get too twisted, flares happen. The tangled magnetic fields snap when they are overtwisted, much like a rubber band that snaps when overtwisted.

A quick explosion of energy known as a solar flare is brought on by the tangling, crossing, or reorganisation of magnetic field lines close to sunspots. It contains electrically charged gases that produce strong magnetic fields in some regions.

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A reaction mechanism is a detailed explanation of the steps involved in a chemical reaction. As a result of the reaction, intermediates, transition states, and products are produced.

The least amount of energy required for a reaction to take place is called activation energy. An intermediate state in a reaction where the reactants have sufficient energy to generate a reaction product is known as an activated complex

. Because the activation energy is the quantity of energy required to break down the energy barrier separating the reactants and the products, it is connected to the energy of reaction

Even though a collision has more energy than the activation energy, a reaction might not happen because the reactants need to be in the right orientation and at the right distance for a reaction product to develop.

Because it takes less energy to break through the energy barrier separating the reactants and the products, the mechanism with the lower activation energy will operate at a quicker rate.

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A reaction mechanism is a detailed explanation of the steps involved in a chemical reaction. As a result of the reaction, intermediates, transition states, and products are produced.

The least amount of energy required for a reaction to take place is called activation energy. An intermediate state in a reaction where the reactants have sufficient energy to generate a reaction product is known as an activated complex

. Because the activation energy is the quantity of energy required to break down the energy barrier separating the reactants and the products, it is connected to the energy of reaction

Even though a collision has more energy than the activation energy, a reaction might not happen because the reactants need to be in the right orientation and at the right distance for a reaction product to develop.

Because it takes less energy to break through the energy barrier separating the reactants and the products, the mechanism with the lower activation energy will operate at a quicker rate.

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We haver the mass from the moles of each of the compounds below.

1) Mass/Molar mass = number of moles

=Mass = Molar Mass * Molar Number

= 12.3 moles x g/mol 108

= 1328.4 g

2) Mass/Molar mass = number of moles

=Mass = Molar Mass * Molar Number

2.7 moles times 242 g/mol

= 653 g

3)) Molar mass divided by the number of moles

=Mass = Molar Mass * Molar Number

= 3.42 g/mol * 0.16 moles

= 54.72 g

4) Moles = mass / molecular mass

=Mass = Molar Mass * Molar Number

= 166 g/mol * 0.87 moles

= 144 g

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Answer:

403.2 grams of oxygen

Explanation:

According to the balanced chemical equation, 2C2H6 + 7O2 —> 4CO2 + 6H2O, 4 moles of carbon dioxide (CO2) are produced for every 7 moles of oxygen (O2) that react. Therefore, if 7.2 moles of carbon dioxide are produced, the number of moles of oxygen that react is (7.2 moles CO2) * (7 moles O2 / 4 moles CO2) = 12.6 moles O2.

Since the molar mass of oxygen is approximately 32 g/mol, the mass of oxygen that reacts is (12.6 moles O2) * (32 g/mol) = 403.2 g. Therefore, 403.2 grams of oxygen react in order to produce 7.2 moles of carbon dioxide.

10.50 kg of iron will be produced from 15 kg of iron (III) oxide.

The amount of matter in an item is measured by its mass, which is a fundamental physical quantity. It is a scalar amount that is measured in kilograms (kg) or grams (g). Regardless of an object's location or the force pressing against it, its mass always remains constant.

Iron (III) oxide and elemental iron react chemically in the following balanced chemical equation:

2 Fe2O3+ 3 C = 4 Fe + 3 CO2

Due to the reaction between 2 moles of Fe2O3 and 4 moles of Fe, the mole ratio of Fe2O3 to Fe is either 2:4 or 1:2.

The amount of iron created from 15 kg of Fe2O3 can be calculated using this mole ratio:

Fe2O3 = 2 moles of Fe per mole.

Fe2O3's molecular weight is 159.69 g/mol.

Fe2O3 has a mass of 15 kg and a density of 15,000 g/mol, or 94.00 moles.

We can figure out how many moles of Fe were produced using the mole ratio of 1:2:

We can figure out how many moles of Fe were produced using the mole ratio of 1:2:

2 moles of Fe for each mole of Fe2O3 94.00 moles of Fe2O3 multiplied by (2 moles of Fe for each mole of Fe2O3) results in 188.00 moles of Fe.

The molar mass of Fe can then be used to convert the moles of iron to mass as follows:

Fe's molecular weight is 55.85 g/mol.

188.00 moles of Fe produced at a rate of 55.85 g/mol result in a mass of 10,499.80 g or 10.50 kg.

Hence, 10.50 kg of iron will be produced from 15 kg of iron (III) oxide.

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To answer this question, we need to know the balanced chemical equation for the reaction between iron (III) oxide and another substance that would produce iron.

Assuming the reaction is:

Fe₂O₃ + 3CO → 2Fe + 3CO₂

This equation tells us that one mole of Fe₂O₃ reacts with three moles of CO to produce two moles of Fe. We can use this information to calculate the number of moles of Fe that can be produced from 450 grams of Fe₂O₃.

Convert the mass of Fe₂O₃ to moles in the first step:

Molar mass of Fe₂O₃ = 2 x atomic mass of Fe + 3 x atomic mass of O = 2 x 55.85 + 3 x 16.00 = 159.69 g/mol

Number of moles of Fe₂O₃ = 450 g / 159.69 g/mol = 2.82 mol

According to the balanced chemical equation, 1 mole of Fe₂O₃ produces 2 moles of Fe. Therefore, the number of moles of Fe that can be produced from 2.82 mol of Fe₂O₃ is:

Number of moles of Fe = 2.82 mol x (2 mol Fe / 1 mol Fe₂O₃) = 5.64 mol

Convert the number of moles of Fe to grams in the final step:

Molar mass of Fe = 55.85 g/mol

Mass of Fe produced = 5.64 mol x 55.85 g/mol = 315.89 g

Therefore, if 450 grams of iron (lll) oxide are reacted with carbon monoxide to produce iron, the amount of iron produced would be 315.89 grams.

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The balanced chemical equation for the reaction of ammonia hydroxide (NH4OH) producing ammonia (NH3) is:

NH4OH → NH3 + H2O

The equation shows that 1 mole of NH4OH produces 1 mole of NH3.

To determine the number of moles of NH3 produced from 7.50 g of NH4OH, we need to first calculate the molar mass of NH4OH:

NH4OH = 1 x 14.01 (atomic mass of N) + 4 x 1.01 (atomic mass of H) + 1 x 16.00 (atomic mass of O) = 35.05 g/mol

Next, we can use the following formula to calculate the number of moles:

moles = mass / molar mass

moles of NH4OH = 7.50 g / 35.05 g/mol = 0.214 mol

Since 1 mole of NH4OH produces 1 mole of NH3, the number of moles of NH3 produced is also 0.214 mol.

Therefore, 7.50 g of NH4OH produces 0.214 moles of NH3.

Answer:

the answer is the option C

Concentration of species capable of effective interactions: Ionic Strength

Correction factor applied to concentrations based on the ionic strength of the solution: Activity coefficient.

Coefficient is a numerical or constant quantity that is placed in front of a variable or term. The term "coefficient" comes from the Latin word "coefficiente  which means "a joint or mutual agreement."

In algebra, coefficients are used to represent the relative size or weight of a variable or term. For example, in the expression 3x + 2y, the coefficients are 3 and 2, which indicate that the variable x has a weight of 3 and the variable y has a weight of 2.

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A. The balanced equation is: Zn + 2HCI -> ZnCl₂ + H₂

B. The mass of zinc chloride formed is 10.43 g

C. The volume of hydrogen gas produced is 1.68 L

First, we shall write the balanced equation for the reaction. This is given below:

Zn + 2HCI -> ZnCl₂ + H₂

Now, we shall determine the mass of zinc chloride, ZnCl₂ formed. Details below:

Zn + 2HCI -> ZnCl₂ + H₂

From the balanced equation above,

65.38 g of Zn reacted to produce 136.38 g of ZnCl₂

Therefore,

5 g of Zn will react to produce = (5 × 136.38) / 65.38 = 10.43 g of ZnCl₂

Thus, the mass of ZnCl₂ formed is 10.43 g

First, we shall obtain the mass of hydrogen gas produced. Details below:

Zn + 2HCI -> ZnCl₂ + H₂

From the balanced equation above,

65.38 g of Zn reacted to produce 2 g of H₂

Therefore,

5 g of Zn will react to produce = (5 × 2) / 65.38 = 0.15 g of H₂

Finally, we shall determine the volume of H₂ produced. Details below:

2 g of H₂ = 22.4 L

Therefore

0.15 g of H₂ = (0.15 g × 22.4 L) / 2 g

0.15 g of H₂ = 1.68 L

Thus, the volume of H₂ produced is 1.68 L

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The empirical formula for Epsom salts is MgSO₄, which means that for every one magnesium atom in the compound, there is one sulfur atom and four oxygen atoms.

To determine the empirical formula of Epsom salts we have to calculate the moles of each element in the sample:

Moles of magnesium = 1.01 g ÷ 24.31 g/mol = 0.0415 mol

Moles of sulfur = 1.33 g ÷ 32.06 g/mol = 0.0415 mol

Moles of oxygen = 2.66 g ÷ 16.00 g/mol = 0.1663 mol

Divide the number of moles of each element by the smallest number of moles:

0.0415 mol Mg ÷ 0.0415 mol = 1

0.0415 mol S ÷ 0.0415 mol = 1

0.1663 mol O ÷ 0.0415 mol = 4

If necessary, multiply each ratio by a whole number to get the smallest possible whole-number ratio:

1 : 1 : 4

This ratio is 1:1:4 for magnesium, sulfur, and oxygen respectively.

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Equilibrium concentration of C₆H₅COO⁻ in the solution is calculated as 2.008 × 10⁻⁴ M.

Measure of the strength of  acid in any solution is called acid-dissociation constant.

The dissociation reaction of benzoic acid (C₆H₅COOH) in water can be represented as follows: C₆H₅COOH + H₂O ⇌ C₆H₅COO⁻ + H₃O⁺

Ka = [C₆H₅CO⁻][H₃O⁺] / [C₆H₅COOH]

Ka = [C₆H₅COO⁻][H₃O⁺] / [C₆H₅COOH]

6.3 × 10⁻⁵ = [C₆H₅COO⁻[H₃O⁺] / 0.0064

[C₆H₅COO-][H₃O⁺] = 6.3 × 10⁻⁵ × 0.0064

[C₆H₅COO⁻][H3O⁺] = 4.032 × 10⁻⁷

[C₆H₅COO⁻] = x

[H₃O⁺] = x

x² = 4.032 × 10⁻⁷

x = √(4.032 × 10⁻⁷)

x = 2.008 × 10⁻⁴

Therefore, the equilibrium concentration of C₆H₅COO⁻ in the solution is 2.008 × 10⁻⁴ M.

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A. The balanced equation is: 2H₂O -> 2H₂ + O₂

B. The mass of hydrogen obtained is 8 g

Ci. The volume of hydrogen produced is 89.6 L

Cii. The volume of oxygen produced is 44.8 L

The balanced equation for the reaction is written as follow:

Water -> Hydrogen + oxygen

2H₂O -> 2H₂ + O₂

first, we shall write the balanced equation for the reaction. This is given below:

2H₂O -> 2H₂ + O₂

From the balanced equation above,

36 g of H₂O reacted to produce 4 g of H₂

Therefore,

72 g of H₂O will react to produce = (72 × 4) / 36 = 8 g of H₂

Thus, the mass of hydrogen obtained is 8 g

The volume of hydrogen produced can be obtained as follow:

2 g of H₂ = 22.4 L

Therefore

8 g of H₂ = (8 g × 22.4 L) / 2 g

8 g of H₂ = 89.6 L

Thus, the volume of hydrogen produced is 89.6 L

First, we shall obtain the mass of oxygen gas produced. Details below:

2H₂O -> 2H₂ + O₂

From the balanced equation above,

36 g of H₂O reacted to produce 32 g of O₂

Therefore,

72 g of H₂O will react to produce = (72 × 32) / 36 = 64 g of O₂

Finally, we shall determine the volume of oxygen produced. Details below:

32 g of O₂ = 22.4 L

Therefore

64 g of O₂ = (64 × 22.4) / 32 g

64 g of O₂ = 44.8 L

Thus, the volume of oxygen produced is 44.8 L

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1017.5 Joules is the heat released when 25g water is condensed at 100 C.

When water is condensed, it changes from a gas to a liquid, releasing heat in the process. The amount of heat released can be calculated using the formula:

q = m * ΔH

where:

q = heat released (in Joules)

m = mass of water (in grams)

ΔH = heat of vaporization of water (in J/g)

The heat of vaporization of water at 100°C is 40.7 kJ/mol, or 40.7 J/g. Therefore, substituting the values in the formula, we get:

q = 25 g * 40.7 J/g

q = 1017.5 J

So the heat released when 25 g of water is condensed at 100°C is approximately 1017.5 Joules.

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Answer:

Final Temperature = 12.20 Celsius

Explanation:

Use the equation:

ΔC*q*m = -ΔC*q*m

[tex]11.27*0.129*(T_{f}-68.23) = -23.16*2.44*(T_{f}-10.76)\\1.45T_{f} -99.19 = -56.51T_{f} +608.15\\T_{f} = 12.20 C[/tex]

Answer: To convert grams (g) to moles (mol), we need to use the molar mass of the substance. We can use the following formula:

moles = mass (in grams) / molar mass

We will assume that we are given the mass of a pure substance. If the substance is a compound, we will need to look up the molar mass in the periodic table or calculate it using the atomic masses of its elements.

Let's assume that we are given 18.2 g of a pure substance and we want to convert it to moles. We will need to look up the molar mass of the substance. For example, let's say the substance is water (H2O):

Molar mass of H2O = 2(1.008 g/mol) + 1(15.999 g/mol) = 18.015 g/mol

Now we can use the formula to convert grams to moles:

moles = 18.2 g / 18.015 g/mol = 1.009 mol

Therefore, 18.2 g of the substance is equivalent to 1.009 mol of the substance.

The specific heat capacity of nickel is given as 0.444 J/g·°C and the calorimeter constant is calculated to be 14.86 J/°C.

To calculate the calorimeter constant, we need to use the heat gained by the water and the heat lost by the nickel. The heat gained by the water can be calculated using the equation:

q₁ = m₁ × C₁ × ΔT

where m₁ is the mass of water, C₁ is the specific heat capacity of water (4.184 J/g·°C), and ΔT is the change in temperature of the water (final temperature - initial temperature).

q₁ = 84.70 g × 4.184 J/g·°C × (31.63 °C - 24.03 °C)

q₁ = 2,550 J

The heat lost by the nickel can be calculated using the equation:

q₂ = m₂ × C₂ × ΔT

where m₂ is the mass of nickel (90.80 g), C₂ is the specific heat capacity of nickel (0.444 J/g·°C)

q₂ = 90.80 g × 0.444 J/g·°C × (98.73 °C - 31.63 °C)

q₂ = 2,654 J

Since the heat lost by the nickel is equal to the heat gained by the water, we can write:

q₂ = q₁ + q₃

where q₃ is the heat absorbed by the calorimeter. Solving for q₃, we get:

q₃ = q₂ - q₁

q₃ = 2,654 J - 2,550 J

q₃ = 104 J

The calorimeter constant can now be calculated using the equation:

C₃ = q₃ ÷ ΔT

C₃ = 104 J ÷ (31.63 °C - 24.03 °C)

C₃ = 14.86 J/°C

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Answer: C) enzymes

When the end product of protein hydrolysis enter the cytoplasm of a cell, they may become building blocks for the synthesis of enzymes