Chemical Reaction and Equation : Fill in the Blanks

1. Chemical Reactions and Equations 

FILL IN THE BLANK       

1. When calcium carbonate is heated, it decomposes to from ………. and………..gas.

Ans.: calcium oxide, carbon dioxide

 

2. Precipitation reactions produce…………………salts.

Ans.: insoluble

 

3. Electrolysis of water is a……………decomposition reaction.

Ans.: Electrolysis

 

4. Reactions in which energy is absorbed are known as ……….reactions.

Ans.: Endothermic

 

5. The new substances produce in a reaction is called as……….. .

Ans.: Product

 

6. The reaction of sodium sulphate and barium chloride results in the formation of white precipitate of………..

Ans.: Barium sulphate

 

7. The addition of oxygen to a substance is called……….

Ans.: Oxidation

 

8. The digestion of food in the body is an example of……… reaction.

Ans.: Decomposition reaction

 

9. When calcium carbonate is heated, it decomposes to give ………. and……….

Ans.: CaO (s) and CO₂ (g)

 

10. In a ……………..reaction two or more substances combine to form a new single substance.

Ans.: Combination

 

New updated Syllabus of Science for session 2021-22

 

11. Addition of hydrogen in a substance in a reaction is known as………………. reaction.

Ans.: Reduction

 

12. In a………….. Reaction two or more substances combine to form a new single substance.

Ans.: Combination

 

13. Unbalanced reactions are also known as ……………….

Ans.: Skeletal

14. Reactions in which heat is given out along with the products are called …………… reactions.

Ans.: Exothermic

 

15. Reactions in which energy is absorbed are known as ……………….reactions.

Ans.: Endothermic

 

16. When high reactive element displaces less reactive element to from new compound, is known as ………… reaction.

Ans.: Displacement

 

17. Those reactions, in which two compounds react by an exchange of ions to form two new compounds, are called …………… reactions.

Ans.: Double displacement

 

18. Reduction is the ……………….of oxygen or gain of hydrogen.

Ans.: Loss

 

19. Redox reaction is a combination of both oxidation and ……………in a reaction.

Ans.: Reduction

 

20. In a chemical reaction always form ………….. products.

Ans.: New

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