Endothermic Reaction

Q.

What are the three main parts of a chemical reaction?

Q.

A chemical reaction in which heat energy is evolved is called an ____________ reaction.

Q.

The vaporisation of water is an __________ change.

Q.

Give a reason for the following statement.

The cooking of food is an endothermic change.

Q.

Write T for true and F for false statements.

Boiling is an exothermic change.

1. True
2. False

Q.

In each of the beakers marked A, B and C, 25 mL of water was taken. Small amounts of Sodium hydroxide, anhydrous Copper sulphate and Ammonium chloride were added to beakers A, B and C respectively. Increase of temperature in breakers A and B was observed while there was a fall of temperature in beaker C. Which of the following statements are correct?

I. Changes in beakers A and B are endothermic.

II. Changes in beakers A and B are exothermic.

III. Change in beaker C is endothermic.

IV. Change in beaker C is exothermic.

1. I and II

2. II and III

3. I and IV

4. I and III

Q. When firewood is cut into small pieces then the rate of reaction for combustion of wood increases. State the reason for this.

Q.

The change during which heat is taken in is called as________change.

Q.

Give a one-word answer for the following.

An example of exothermic change.

Q.

Which of the following is not endothermic reaction?

1. Cooking of food

2. Conversion of ice to water

3. Sublimation of camphor

4. Combustion of wood

Q.

The reaction in which energy is absorbed is called as an _____________.

1. Endothermic reaction

2. Physical reaction

3. Combination reaction

4. Exothermic reaction

Q.

Formation of Nitric Oxide is ___ reaction.

Q. Reactions in which energy is absorbed, usually in the form of heat are known as ___ reactions.

Q.

Which of the following is not endothermic reaction?

1. Cooking of food

2. Sublimation of camphor

3. Conversion of ice to water

4. Combustion of wood

Q.

The reaction in which energy is absorbed is called as an _____________.

1. Exothermic reaction

2. Endothermic reaction

3. Physical reaction

4. Combination reaction