Question

When a material in the liquid state is vaporized and then condensed to a liquid, the steps in the process are, respectively,?

Answer 1

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Below are the choices that can be found from other sources.
The answer is C endothermic and exothermic

a. exothermic and exothermic
b. exothermic and endothermic
c. endothermic and exothermic
d. endothermic and endothermic

Answer 2

When a material in the liquid state is vaporized and then condensed to a liquid, the steps in the process are $\boxed{{\text{endothermic}}}$ and $\boxed{{\text{exothermic}}}$ respectively.

Further Explanation:

Changes are of two types:

(A) Physical changes:

It is the process in which the physical properties of the system are affected. These changes can also be reversed by physical methods. In these kinds of changes, the molecular composition of the substance remains the same. These are reversible in nature and no new substances are formed. For example, boiling of water, chopping of wood, melting of wax are physical changes.

(B) Chemical changes:

In this change, new substances are formed by the chemical combination of the previous substances. The chemical properties of substance change when it undergoes a chemical change. These are irreversible in nature. For example, fermentation of grapes, burning of wood, rusting of iron are chemical changes.

Condensation: It is the process when vapors are converted to the liquid state.

Evaporation: It is the process in which liquid is converted into vapors.

Endothermic reactions are those in which more energy needs to be supplied to the system than that released by it.

Exothermic reactions are those in which more energy is released by the system than that supplied to it.

In the first step, the liquid is vaporized. The intermolecular forces in liquid state are to be broken down and energy is supplied for the purpose. Hence it is an endothermic process.

In the second step, the gas is condensed. The intermolecular forces in the gas are weaker than that in liquid state and energy is released during the conversion of gas to liquid. Hence it is an exothermic process.

Learn more:

1. Which of these is an extensive property? brainly.com/question/1398514

2. Which of the phase changes is an exothermic change? brainly.com/question/1875234

Answer details:

Grade: Senior School

Subject: Chemistry

Chapter: Physical and chemical changes

Keywords: physical change, chemical change, liquid, gas, evaporation, condensation, endothermic, exothermic, intermolecular forces.