Chemistry test

Which of the following describes a solid?

• Fixed shape and volume

• Fixed volume but no fixed shape

• Neither fixed shape nor volume

• Compressible with high energy particles

What happens to particles in a liquid when it is heated?

• They move more slowly

• They move faster and collide more often

• They stop moving

• They become stationary

What is sublimation?

• A solid turning into a liquid

• A gas turning into a liquid

• A solid turning directly into a gas

• A gas turning directly into a solid

Which of the following substances sublimates?

• Water

• Carbon dioxide

• Sodium chloride

• Ethanol

In a gas, how are the particles arranged?

• Closely packed in a fixed pattern

• Closely packed but able to slide past each other

• Spread out and move randomly

• Stationary and arranged in rows

What does the flat region on a heating curve represent?

• A change in state

• A constant temperature

• Both a and b

• None of the above

Brownian motion provides evidence for:

• Particles in liquids being stationary

• Random movement of particles

• Strong forces between particles in gases

• Formation of solids from liquids

What causes diffusion in gases?

• Movement of heavy particles only

• Random motion of particles

• Presence of other substances

• External pressure

Which of the following changes involve a loss of energy?

• Melting and evaporation

• Freezing and condensation

• Sublimation and melting

• Condensation and sublimation

Which of the following is the definition of an element?

• A substance that can be broken into simpler substances

• A substance that contains only one type of atom

• A mixture of different atoms and compounds

• A compound that contains multiple elements