Quiz on States of Matter and Phase Changes

The particles of a single substance in a ___ are characterized by having the greatest amount of kinetic energy.

• solid

• liquid

• gas

Refer to the graph. What is the term for the phase change from a liquid to a gas?

• freezing

• melting

• condensation

• boiling (vaporization)

Refer to the graph. During a phase change, the temperature:

• increases

• stays the same

• decreases

• varies inconsistently

Refer to the graph. Liquid water temperature rises at what point on the graph?

• 1

• 2

• 3

• 4

Refer to the graph. Liquid water boils at 100 °C, how is this represented on the graph?

• The graph increases

• The graph has an increasing slope

• The graph decreases

• The graph is constant

Refer to the graph. At what point on the graph indicates that the water has turned to steam?

• 5

• 3

• 2

• 1

The following reaction represents a(n) ___ process: Heat + NH₄Clₒ + H₂Oₒ → NH₄Clₐq

• endothermic

• exothermic

• both of these

• none of these

How does the freezing point of a given substance compare to its melting point at the same pressure?

• Freezing point is equal to the melting point.

• Freezing point is less than the melting point.

• Freezing point is greater than the melting point.

• They vary with changing gravity.

The average kinetic energy of the particles in solids, liquids, and gases is measured as ___

• temperature

• density

• volume

• pressure

When heat is released by a chemical reaction, the energy term appears as showing

• ΔH is positive.

• ΔH is negative.