Question

1) The chemical composition of Shahabad tile is mainly calcium carbonate. During its cleaning with hydrochloric acid the upper layer of the tile reacts with hydrochloric acid and three products are formed, one out of which gets washed with water. Name the product.

a) Calcium carbonate

b) CaCl2

c) CaCO3

d) Calcium Chloride

2) We find many examples of chemical changes in our surrounding, body, home and laboratory. Respiration is a continuously occuring biological process. In this process, we inhale the air and exhale carbon dioxide and water vapour. _____ is the main reactant that is also a carbon compound which during respiration gives rise to formation of carbon dioxide as main product.

a) Sugar

b) Maltose

c) Glucose

d) Sucrose

3) Pair me up:

Option A

a) Sodium

b) Carbon dioxide

Option B

a) Reactant in photosynthesis reaction

b) Reactant in combustion reaction
c) Tendency to loose electron​

Answer 1

Answer:

c caco3

Explanation:

Answer 2

Answer:

Explanation:

The chemical composition of Shahabad tile is mainly calcium carbonate. During its cleaning with hydrochloric acid the upper layer of the tile reacts with hydrochloric acid and three products are formed, one out of which gets washed with water. Name the product.

a) Calcium carbonate

b) CaCl2

c) CaCO3

d) Calcium Chloride

The product that is washed away with water is calcium chloride.

2) We find many examples of chemical changes in our surrounding, body, home and laboratory. Respiration is a continuously occuring biological process. In this process, we inhale the air and exhale carbon dioxide and water vapour. _____ is the main reactant that is also a carbon compound which during respiration gives rise to formation of carbon dioxide as main product.

a) Sugar

b) Maltose

c) Glucose

d) Sucrose

Glucose is the main reactant of cellular respiration, which is a metabolic pathway that breaks down the energy within glucose molecules and produces ATP (energy). During cellular respiration, glucose is broken down, producing carbon dioxide as a by-product.

3) Pair me up:

a) Sodium                   -  Tendency to loose electron​

b) Carbon dioxide      -  Reactant in combustion reaction

c) H2O                         -  Reactant in photosynthesis reaction

ANSWER:

• The reactant in photosynthesis is water (H2O).
• The reactant in a combustion reaction is typically a hydrocarbon compound, such as methane, propane, or butane.

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