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1Which of the following is a physical change?

A Burning wood B Melting ice C Cooking an egg D Rusting of iron

2What is the chemical formula for water?

A H2O B CO2 C NaCl D HCl

3Which gas supports combustion?

A Oxygen B Carbon dioxide C Nitrogen D Hydrogen

4Which of the following is a strong acid?

A Vinegar B Lemon juice C Hydrochloric acid D Baking soda

5What is the pH value of a neutral solution?

A 7 B 1 C 14 D 0

6Which of the following is a compound?

A Oxygen B Helium C Water D Iron

7What gas do plants use during photosynthesis?

A Carbon dioxide B Oxygen C Nitrogen D Hydrogen

8Which substance turns red litmus paper blue?

A Acid B Base C Neutral D Salt

9What is the process of a solid changing directly into a gas called?

A Condensation B Evaporation C Sublimation D Melting

10Which gas is produced when a metal reacts with an acid?

A Oxygen B Hydrogen C Carbon dioxide D Nitrogen