I Ready Unit 4C: Concept Change: Changes to Matter 3.5C

Students tape a bag of ice cubes to a classroom window. After 20 minutes, they observe droplets of water forming on the outside of the bag. Which process causes these water droplets to appear?

• Accumulation

• Evaporation

• Precipitation

• Not here

In the water cycle, what causes the process that takes place at stage 1?

• Cold air rising

• Subfreezing temperature

• Removing heat

• Adding heat

Students observe the changes that occur when substances are heated. Which of the following is NOT an accurate observation?

• When chocolate is heated, it melts.

• Heating cheese causes the particles to move slower.

• Ice melts when heated.

• When ice is heated, the particles move to a more active state.

Students study changes to water caused by freezing, evaporating, melting and cooling. Which of these processes occurs when water changes from a liquid to a gas?

Students investigate states of matter. Water is placed in a freezer. What will happen to the water if it is left in the freezer overnight?

• It will solidify.

• It will form a gas.

• It will thicken.

• It will melt.

Water undergoes changes in state because temperature affects the speed of its particles. Which of the following statements best explains why water changes into a gas when heated?

• The lower the temperature, the slower the speed of particles.

• Particles of liquids can move from place to place.

• The higher the temperature, the faster the speed of particles.

• Water takes the shape of its container.

A student places five different substances in separate beakers. The student then places each beaker on a hot plate and heats the substances for five minutes. Which substances change state when tested in this manner?

Select TWO correct answers.

• Chocolate Chip

• Penny

• Craft Stick

• Pebble

• Ice Cube

Which number shows the stage in the water cycle when water changes from a gas to a liquid?​ (a)  

• 1
• 2
• 3
• 4
• 5

Water changes its state of matter when heat is added or taken away. When water boils, the particles ---

• are closer together

• are moving more rapidly

• stay the same

• are moving more slowly

On a sunny day, a student leaves a bottle containing partially frozen water on the beach.

What changes will most likely occur after 20 minutes?

• The water in the bottle will freeze.

• Condensation will form on the outside of the bottle.

• The water in the bottle will evaporate completely.

• Heat will cause the plastic bottle to melt.