Question

CHEMISTRY

Q1 Fill in the blanks : -

(i) In a ________ reaction two or more substances combine to form a new single substance.

(ii) Unbalanced reactions are also known as _________.

(iii) Reactions in which heat is given out along with the products are called _________reactions.

(iv) Those reactions, in which two compounds react by an exchange of ions to form two new compounds, are

called ________ reactions.

(v) The digestion of food in the body is an example of ____________ reaction.

(vi) When calcium carbonate is heated, it decomposes to give___________ and _________.

Q2 True/ False : -

(i) A complete chemical equation represents the reactants, products and their physical states symbolically.

(ii) A magnesium ribbon burns with a dazzling flame in air (oxygen) and changes into a white substance,

magnesium oxide.

(iii) Rusting is a double decomposition reaction.

(iv) The reaction between nitrogen and hydrogen to give ammonia is an example of a combination reaction.

(v) Action of heat on ferrous sulphate is an example of decomposition reaction.

(vi) The number of atoms of each element is conserved in any chemical reaction.​

Answer 1

Answer:

Explanation:

i) combination reaction

ii) Skeletal reaction

iii) exothermic chemical reactions.

iv)double displacement reactions

v)combination reaction

Q2 .

i) true

ii) false