MS Physical Science Apex Unit 5 Test Review

The photograph shows a glue gun. This tool heats a solid stick of glue until it becomes a liquid. Which physical change is shown in the photograph?

• Melting

• Condensing

• Dissolving

• Crystallizing

Which action is a change in state?

• Condensing

• Tearing

• Stretching

• Dissolving

A shiny silver spoon became dull and black over time. What most likely happened to the spoon?

• The metal reacted with air to form a new substance.

• Black dirt collected on the shiny metal.

• The metal mixture began to separate.

• The metal dissolved into a black tarnish.

A science teacher placed a magnesium wire in a flame. The wire turned white where the flame touched it. Which statement best explains the chemical change?

• A new substance formed.

• The magnesium wire changed shape.

• The substance changed state.

• The magnesium wire dissolved.

Which evidence would most strongly indicate that a chemical change is taking place?

• Fizzing

• Changing state

• Breaking

• Changing Shape

Which observation is the best indication that a chemical reaction has occurred?

• Presence of ashes

• change in temperature

• absence of fizzing

• change from liquid to gas

Which two changes of state can be caused by removing thermal energy from a substance?

• Condensation and deposition

• condensation and vaporization

• vaporization and sublimation

• deposition and sublimation

Which change of state is the reverse of condensation?

• vaporization

• freezing

• deposition

• melting

The graph shows the change in temperature of a sample of water in a closed system as thermal energy is added over time. What happens to the temperature of the water during changes of state?

• it remains the same

• it increases gradually

• it falls sharply

• it decreases gradually

A sealed plastic bottle of apple juice is placed in the freezer. Which statement describes what is happening while the juice is changing from a liquid to a solid?

• Particle speed is staying the same.

• Kinetic energy is increasing.

• Particle motion is coming to a complete stop.

• Temperature is decreasing steadily.