# Lesson Worksheet: Changes of State Science

In this worksheet, we will practice describing and explaining changes of state, and identifying these changes through diagrams and heating curves.

Q1:

Which of the following is not the name for a change of state?

• AMelting
• BFreezing
• CDissolution
• DVaporization
• ECondensation

Q2:

Which category of energy does a substance usually gain or lose to undergo a change of state?

• AGravitation potential energy
• BElectrical potential energy
• CElastic potential energy
• DThermal energy
• EMagnetic energy

Q3:

The diagram below outlines the changes in state between solids, liquids, and gases. What name is given to process X? • AVaporization
• BMelting
• CSublimation
• DCondensation
• EFreezing

Q4:

In the diagram below, the attractive forces between two molecules in a liquid are indicated by an arrow. The larger the arrow, the stronger the attractive force. What will these arrows look like if the liquid undergoes a change of state to a gas?

• A • B • C Q5:

The graph below shows how the temperature of a solid changes over time when heated. The part of the graph marked X indicates the point at which a change of state from a solid to liquid occurs. At this point, the temperature remains constant despite there being continuous heating. What name is given to the heat required for a change of state to occur? • APhase heat
• BSpecific heat
• CExcess heat
• DLatent heat
• ESensible heat

Q6:

Order the following statements to describe what happens when a solid is heated. • A4, 3, 1, 2
• B4, 1, 3, 2
• C2, 3, 1, 4
• D3, 1, 4, 2
• E1, 4, 2, 3

Q7:

The diagram below shows the arrangement of particles before and after a change of state. Which change in state is shown in the diagram? • BMelting
• CVaporization
• DCondensation
• EFreezing

Q8:

The diagram below outlines the changes in state between solids, liquids, and gases. What name is given to process X? • AMelting
• BSublimation
• CVaporization
• DCondensation
• EFreezing

Q9:

Three states of matter are shown in containers A, B, and C. What change will occur during the process of melting? • AC to B
• BA to B
• CB to C
• DC to A
• EA to C

Q10:

The diagram below shows a progressive change of state. Which of the arrows indicates an increase of temperature? • AA
• BB