1. Chemical Reactions and Equations
FILL IN THE BLANK
- When calcium carbonate is heated, it decomposes to from ………. and………..gas.
Ans.: calcium oxide, carbon dioxide
- Precipitation reactions produce…………………salts.
Ans.: insoluble
- Electrolysis of water is a……………decomposition reaction.
Ans.: Electrolysis
- Reactions in which energy is absorbed are known as ……….reactions.
Ans.: Endothermic
- The new substances produce in a reaction is called as……….. .
Ans.: Product
- The reaction of sodium sulphate and barium chloride results in the formation of white precipitate of………..
Ans.: Barium sulphate
- The addition of oxygen to a substance is called……….
Ans.: Oxidation
- The digestion of food in the body is an example of……… reaction.
Ans.: Decomposition reaction
- When calcium carbonate is heated, it decomposes to give ………. and……….
Ans.: CaO (s) and CO2 (g)
- 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
- Addition of hydrogen in a substance in a reaction is known as………………. reaction.
Ans.: Reduction
- In a………….. Reaction two or more substances combine to form a new single substance.
Ans.: Combination
- Unbalanced reactions are also known as ……………….
Ans.: Skeletal
- Reactions in which heat is given out along with the products are called …………… reactions.
Ans.: Exothermic
- Reactions in which energy is absorbed are known as ……………….reactions.
Ans.: Endothermic
- When high reactive element displaces less reactive element to from new compound, is known as ………… reaction.
Ans.: Displacement
- Those reactions, in which two compounds react by an exchange of ions to form two new compounds, are called …………… reactions.
Ans.: Double displacement
- Reduction is the ……………….of oxygen or gain of hydrogen.
Ans.: Loss
- Redox reaction is a combination of both oxidation and ……………in a reaction.
Ans.: Reduction
- In a chemical reaction always form ………….. products.
Ans.: New
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