Quiz on Matter and Chemical Changes

Which statement best explains why gases can be compressed easily?

• Gases have strong intermolecular forces

• Gas particles have large spaces between them

• Gas particles have fixed positions

• Gas particles move very slowly

When a solid melts into a liquid, what happens to its particles?

• They lose all kinetic energy

• They vibrate less vigorously

• Their inter-particle space increases

• They become completely free from attraction

Why does a closed bottle of soda fizz when opened?

• Increase in pressure releases gas

• Decrease in pressure reduces solubility of gas

• Temperature increases suddenly

• Kinetic energy of gas decreases

Which of the following explains why evaporation is a cooling process?

• Molecules absorb heat and leave the surface

• Molecules release heat and remain on surface

• Inter-particle forces increase

• Density of liquid increases

Which of the following processes involves the greatest increase in inter-particle space?

• Melting

• Condensation

• Freezing

• Vaporization

10 g of CaCO₃ is heated to form CaO and CO₂. The total mass of products will be:

• Less than 10 g

• Equal to 10 g

• Greater than 10 g

• Cannot be predicted

Which experiment best proves the law of conservation of mass?

• Heating copper wire in air

• Burning candle in open air

• Reacting vinegar and baking soda in a sealed flask

• Boiling water in an open beaker

In a reaction, 12 g of carbon combines with 32 g of oxygen. The mass of CO₂ formed will be:

• 32 g

• 44 g

• 12 g

• 20 g

Which of these is NOT a chemical change?

• Rusting of iron

• Burning of paper

• Melting of ice

• Cooking of rice

Which observation confirms that a chemical change occurred during burning of magnesium?

• Change in shape

• Formation of a white ash

• Temporary color change

• Physical state remains same