Melinda drew an illustration of the three states of matter. The illustration shows what she drew.

Melinda wanted to replace the numbers with labels identifying the correct state of matter. How should she change the numbers?

• 1. solid

  2. liquid

  3. gas

• 1. gas

  2. liquid

  3. solid

• 1. liquid

  2. solid

  3. gas

• 1. liquid

  2. gas

  3. solid

Solids, liquids, and gases can change state. The illustration shows matter undergoing a change in state.

What change of state does this illustration show?

• a gas cooling

• a gas turning into a liquid

• a liquid turning into a solid

• a liquid turning into a gas

Jessica did an investigation about the states of matter. As part of the investigation, Jessica wanted to change a liquid to a solid. What must she do to bring about this change in state?

• Place the liquid in a different container

• Stir the liquid as quickly and thoroughly as possible

• Increase the energy of the liquid so that its particles move faster

• Remove energy from the liquid so that its particles slow down

Which statement describes the direction of heat flow in order to change a liquid into a gas?

• Heat must be added to the gas.

• Heat must be added to the liquid.

• Heat must be taken away from the gas.

• Heat must be taken away from the liquid.

Adding heat to a system may result in a change in temperature and possible a change of state.

Which of the following could result from heat being transferred to a substance?

• The temperature of the substance increases.

• The temperature of the substance decreases.

• The substance changes from a liquid to a solid.

• The substance changes from a vapor to a liquid.

Which statement BEST describes a gas and its particles?

• A gas assumes the shape of the occupied part of its container, gas particles can slide past one another.

• A gas assumes the shape and volume of its container, gas particles can move freely

• A gas assumes the volume of its container, gas particles are close together.

• A gas retains its fixed volume and shape, gas particles are locked into place.

Which group of physical properties identifies a solid?

• no definite shape, no definite volume, and slow-moving atoms

• definite shape, definite volume, and slow-moving atoms

• definite shape, no definite volume, and fast-moving atoms

• no definite shape, definite volume, and fast-moving atoms

The process in which a gas cools and becomes a liquid is called

• evaporation

• sublimination

• boiling

• condensation

The temperature at which a liquid boils

• boiling point

• melting point

• both(a) and (b)

• none

What is the term for combining 2 or more atoms together?

• atoms
• elements
• molecules
• compounds