Topic 2 Test

Which of the following is a physical property that can be used to identify a pure substance?

• Reactivity with acid

• Melting point

• Ability to rust

• Combustibility

Tags

VA.PS.3.a

A student observes that a substance has a boiling point of 100°C and a melting point of 0°C. What can be inferred about the substance?

• It is likely to be ethanol.

• It is likely to be water.

• It is likely to be iron.

• It is likely to be sodium chloride.

Tags

VA.PS.3.a

According to the kinetic molecular theory, what happens to the particles of a gas when the temperature increases?

• They move slower.

• They move faster.

• They stop moving.

• They move at the same speed.

Tags

VA.PS.2.c

How does the kinetic molecular theory explain the expansion of a balloon when heated?

• The particles move closer together, increasing pressure.

• The particles move faster and spread apart, increasing volume.

• The particles stop moving, causing the balloon to expand.

• The particles decrease in size, allowing more air in.

Tags

VA.PS.2.c

Which of the following is a chemical property that can be used to identify a pure substance?

• Density

• Solubility

• Flammability

• Color

Tags

VA.PS.3.a

A student is given a sample of an unknown pure substance. Which property should they measure to help identify it?

• Mass

• Volume

• Density

• Shape

Tags

VA.PS.3.a

What does the kinetic molecular theory suggest about the particles in a solid?

• They are in constant motion and far apart.

• They are in fixed positions and vibrate in place.

• They move freely and rapidly.

• They are not moving at all.

Tags

VA.PS.2.c

How can the kinetic molecular theory be used to explain the process of diffusion in gases?

• Particles move randomly and spread out to fill the available space.

• Particles move in a straight line until they hit a barrier.

• Particles are attracted to each other and clump together.

• Particles remain stationary and do not mix.

Tags

VA.PS.2.c

Which of the following is an example of a physical change?

• Burning wood

• Rusting iron

• Melting ice

• Baking a cake

Tags

VA.PS.3.a

A student heats a liquid and observes that it turns into a gas. Which property of the liquid is being demonstrated?

• Boiling point

• Density

• Solubility

• Viscosity

Tags

VA.PS.3.a