Chemical Equation

Q. Match the symbols to their correct representation in a chemical equation.

1. →
2. ↓
3. ↑

Q. Question 16

Which one of the following processes involves chemical reactions?

(a) Storing of oxygen gas under pressure in a gas cylinder.
(b) Liquefaction of air.
(c) Keeping petrol in a china dish in the open.
(d) Heating copper wire in presence of air at high temperature.

Q.

The total mass of the substances involved in a chemical change remains constant.

1. True
2. False

Q.

In a mixture, no heat changes occur while mixing.

1. True
2. False

Q.

A. Name the type of reaction where more than one reactant combines to form a single product.

B. Write a balanced chemical equation with state symbols for the given reaction:
Carbon reacts with oxygen to form carbon dioxide along with the evolution of heat.

Q. Which is not an indicator of chemical reaction?

1. Change in state
2. Change in colour
3. Change in mass
4. Change in temperature

Q.

Write the balanced chemical equation for the reaction of Dilute Sulphuric acid and barium chloride solution?

Q.

A. Name the type of reaction where more than one reactant combines to form a single product.

B. Write a balanced chemical equation with state symbols for the given reaction:
Carbon reacts with oxygen to form carbon dioxide along with the evolution of heat.

Q. Explain the term reactant and product giving examples.