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azamat
3 years ago
12

In an exothermic reaction, the enthalpy change is negative. Which of the following is also true for an exothermic reaction?

Chemistry
2 answers:
Savatey [412]3 years ago
7 0
The statement that is also true for an exothermic reaction would be that the products have a lower potential energy than the reactants.
lakkis [162]3 years ago
3 0

<u>Answer: </u>The correct statement is the products have a lower potential energy than the reactants.

<u>Explanation:</u>

Exothermic reactions are defined as the reactions in which the enthalpy change of a reaction is negative.

Enthalpy of a reaction is determined by the equation:

\Delta H_{rxn}=\sum H_{products}-\sum H_{reactants}

As, the enthalpy change of the reaction is negative, which means that the potential energy of the products is less than the potential energy of the reactants.

Hence, the correct statement is the products have a lower potential energy than the reactants.

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Reactants are the substances that undergo changes and the new substance created from it is called products.
5 0
3 years ago
The value of K at constant temperature depends on the amounts of reactants and products that are mixed together initially. A lar
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Answer:

a) K = [ CO2(g) ]

⇒ the [ CaCO3(s) ] does not appear in the denominator of the equilibrium constant, as it is a pure solid substance.

b) Kp = K (RT)∧Δn

⇒ the values of K and Kp are not the same

c) K >> 1, The reaction has a high yield and is said to be shifted to the right. then the rate of the forward reaction is greater than the rate of the reverse reaction at equilibrium.

Explanation:

a) CaCO3(s) ↔ CaO(s) + CO2(g)

⇒ K = [ CO2(g) ]

∴ the [ CaCO3(s) ] does not appear in the denominator of the equilibrium constant, as it is a pure solid substance.

b) H2(g) + F2(g) ↔ 2 HF(g)

⇒ K = [ HF(g) ] ² / [ F2(g) ] * [ H2(g) ]

⇒ Kp = PHF² / PF2 * PH2

for ideal gas:

PV = RTn

⇒ P = n/V RT = [ ] RT

⇒ Kp = K (RT)∧Δn

⇒ the values of K and Kp are not the same.

c) K >> 1, The reaction has a high yield and is said to be shifted to the right. then the rate of the forward reaction is greater than the rate of the reverse reaction at equilibrium.

8 0
3 years ago
The state of matter with a specific volume but no definite shape is the ______. state
eimsori [14]

Answer:

C: liquid

Explanation:

Liquid has the set volume as it cannot be compressed or 'expanded' like a gas. However, liquids will take the shape of the container you put them in so their shape can change.

4 0
3 years ago
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Bacteria that live around deep-sea, hot-water vents obtain energy by oxidizing inorganic hydrogen sulfide belched out by the ven
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Answer:

Chemoautotrophs

Explanation:

Autotrophs are groups of organisms that are capable of manufacturing their own food (organic molecules) through the fixation of carbon dioxide. There are two types of autotrophs:

  • <em>Photoautotrophs fix carbon dioxide by using light as the energy for driving the process.</em>
  • <em> </em><em>Chemoautotrophs f</em><em>ix carbon dioxide by  using energy from the oxidation of inorganic molecules such as magnesium, or sulfur.</em>

Chemoautotrophs usually inhabit extreme environment such hot vents, deep sea, etc.

3 0
3 years ago
If the world suffered a huge catastrophic event (an event causing great and often sudden damage or suffering; a disaster) that w
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Answer:

An asexually reproducing organism would have the best chance of repopulating the world.

Explanation:

Sexual reproduction is a method of reproduction that involves two parents and the formation and subsequent fusion of male and female gametes during fertilization. On the other hand, In asexual reproduction, only one parent is involved and produces offspring by making copies of itself through various methods such as binary fusion, budding and vegetatively.

In a case of a catastrophic event that wiped out almost all organisms, an organism that reproduces asexually have a greater chance of repopulating the world because of the following advantages in reproducing asexually:

1. Only one parent is needed, therefore reproduction is easier.

2. It isaves time and energy. Since almost all organisms have been wiped out, there is a lesser likelihood of finding a compatible mate, so reproducing asexually will give the organism a better chance.

3. It occurs at a very fast rate; much faster than sexual reproduction

4. The population can increase very quickly and colonization of new habitats is much easier.

All these advantages will give the esexually reproducig organism a fairer chance to repopulate the world.

3 0
3 years ago
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