Heat Evolved

Q.

What is the reason respiration is considered an exothermic reaction?

Q.

What are the advantages of being endothermic?

Q.

The reactions which produce light and heat are known as _______________.

1. combustion reaction

2. exothermic reaction

3. endothermic reaction

4. photochemical reaction

Q.

During a chemical reaction, if the reactants have more chemical energy than the products formed,

1. energy is absorbed

2. energy is released

3. no changes in energy

4. depends

Q. Heat energy is either absorbed or evolved during a chemical change.

1. False
2. True

Q.

When water is added to quick lime,

1. a little amount of heat energy is evolved.

2. a large amount of heat energy is evolved.

3. a large amount of heat energy is absorbed.

4. a little amount of heat energy is absorbed.

Q.

The reaction in which heat energy is released is known as ____________ (exothermic/endothermic) reaction.

Q.

Respiration is an exothermic process (release of energy).

1. True

2. False

Q. Chemical formula of exothermic reaction

Q.

2g of silver chloride is taken in a china dish and the china dish is placed in sunlight for some time. What will be your observation in this case? Write the chemical reaction involved in the form of a balanced chemical equation. Identify the type of chemical reactions.

Q. For which of the following processes is Oxygen a prerequisite?

1. Inspiration
2. Expiration
3. Both (A) and (B)
4. Inspiration and combustion

Q.

When dilute hydrochloric acid reacts with sodium hydroxide,

1. some heat is absorbed

2. some heat is released

3. no heat is released

4. depends

Q.

Statement 1: Nitrogen and hydrogen combine together to form ammonia.
Statement 2: It is an exothermic reaction.

1. Statement 1 is false and Statement 2 is true

2. Both Statement1 and Statement2 are true.

3. The Statement1 is true but the Statement 2 is false.

4. Both Statement 2 and Statement 1 are false.

Q. Why is respiration considered an exothermic process?

Q.

Complete the equation: ${\mathrm{CaCO}}_3\stackrel{∆}{\to }$

Q. Heat energy is either absorbed or evolved during a chemical change.

1. False
2. True

Q. Which of these is not a property of respiration?

(a) It occurs at high temperature.
(b) It occurs only in living cells.
(c) It releases energy in steps.
(d) It is a slower porcess than combustion.

Q.

Burning of coal ______energy.

1. absorbs

2. releases and then absorbs

3. can't predict

4. releases

Q.

What happens when quick lime is added to water?

1. Heat is evolved

2. Heat is absorbed

3. Nothing

4. No change in heat

Q.

Respiration is an exothermic reaction.

1. True

2. False

Q.

Which among the following is an exothermic reaction (releases energy)?

1. Melting solid salts

2. Heating water

3. All of the given options

4. Reaction during respiration

Q.

Identify the type of reaction

$2{\mathrm{KNO}}_3\left(\mathrm{s}\right)\to 2{\mathrm{KNO}}_2\left(\mathrm{s}\right)+{\mathrm{O}}_2\left(\mathrm{g}\right)$

Q. Which of the following is an example of exothermic reaction?

1. Evaporation
2. Sublimation
3. Combustion
4. Melting