Endothermic and Exothermic reaction

Q.

Limestone on heating decomposes into quick lime and carbon dioxide gas.What type of reaction is this?

1. Thermal Decomposition.

2. Endothermic Reaction.

3. Endothermic and thermal decomposition reaction.

4. Exothermic reaction.

Q. “The energy changes during a chemical reaction may take place in the form of heat , light and electricity.” Meaning of the sentence

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 ribbon of silvery-white element when heated in a flame burns with a dazzling white light and leaves a white powder. The white powder when dissolved in water turns red litmus blue. Answer the following:

What is the type of reaction that occurs during the burning of the element?

Q.

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

1. Endothermic

2. Exothermic

3. Combination

4. Substitution

Q. A process in which heat is released along with the formation of products is called a/an reaction.

1. endothermic
2. exothermic
3. precipitation

Q.

What do you observe when:

• Water is added to quicklime.

Q.

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

1. Exothermic reaction

2. Substitution reaction

3. Endothermic reaction

4. Physical reaction

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