Endothermic and Exothermic Reaction

Q.

Why is respiration an exothermic reaction?

Q.

The decomposition of vegetable matter into compost is an example of _____.

1. exothermic

2. displacement

3. redox

4. endothermic

Q.

Respiration in humans is an example of ___________ reaction.

1. Exothermic

2. Combination

3. Endothermic

4. Exothermic and combination

Q.

Magnesium ribbon burns in air to produce white substance called magnesium oxide. Which type of reaction is this?

1. Exothermic reaction

2. Endothermic reaction

3. Oxidation reaction

4. Exothermic and oxidation reaction

Q. What does a thermochemical reaction do?

1. Glucose is formed
2. Gives no idea about the heat
3. Always absorbs heat
4. Heat is released or absorbed

Q. Give reason :​
(a) Magnesium is used in fireworks.​ ​

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.

During endothermic reactions, heat is transferred from the reacting substances to the surroundings.

1. True
2. False

Q.

Define Endothermic Reaction

Q.

(a) What is combustion?

(b) Two glass jars A and B are filled with carbon dioxide and oxygen gases respectively. In each jar, a lighted candle is placed simultaneously. In which jar, will the candle remain lighted for a longer time and why?

Q.

Classify the following reaction as:

$2\mathrm{AgBr}\stackrel{\mathrm{Sunlight}}{\to }2\mathrm{Ag}+{\mathrm{Br}}_2$

(i) Chemical combination or synthesis.

(ii) Chemical decomposition reaction.

(iii) Double decomposition reaction.

(iv) Displacement or substitution reaction.

(v) Neutralization reaction.

(vi) Reversible reaction.

(vii) Photochemical reaction.

(viii) Isomerisation or rearrangement reaction.

Q.

What are the characteristics of Nitrated Cotton or Nitro - Cellulose?

1. Burns spontaneously

2. Leaves no residue

3. Makes noise while burning

4. All of these

Q. Rashi was performing an experiment. She mixed a compound X with water in a beaker. She found that the beaker was becoming hot, releasing heat and forming a new substance Y. She was shocked and left the room leaving the product. After three-four days when she returned, she found that the substance Y has changed into a shiny substance Z. What are X, Y and Z.

1. 
2. 
3. 
4. 

Q.

(a) What is combustion?

(b) Two glass jars A and B are filled with carbon dioxide and oxygen gases respectively. In each jar, a lighted candle is placed simultaneously. In which jar, will the candle remain lighted for a longer time and why?

Q.

The reaction in which heat is liberated is called _____________ reaction.

1. Endothermic

2. Exothermic

3. Combination

4. Substitution

Q.

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

1. Exothermic reaction

2. Endothermic reaction

3. Physical reaction

4. Substitution reaction

Q. Respiration is an exothermic reaction.

1. True

2. False

Q.

In photosynthesis, the light energy (from sun) is converted to chemical energy that can be later released to fuel the organism's activities. This is an example of ________________ reaction.

1. Exothermic

2. Combination

3. Substitution

4. Endothermic

Q. A process in which heat is released along with the formation of products is called ___.