Physical and Chemical Changes Stemscopes Review

An increase in temperature will cause which of the following to occur:

• Water vapor in the air condensing to form clouds

• Water in a lake freezing into solid ice

• A balloon filled with air falling slowly to the ground

• A solid bar of chocolate melting and changing shape

Autumn is teaching her sister about phase changes and wants to use an example of what would occur when heat is removed from a system. Autumn explains that removing heat will result in which of the following changes? A A gas becomes a solid. B A solid becomes a liquid. C A liquid becomes a solid. D A solid becomes a gas.

• A solid becomes a liquid

• A gas becomes a solid

• A liquid becomes a solid

• A solid becomes a gas

The same number of ____________that existed before the reaction exist after the reaction.

• solids

• particles or molecules

• physical changes

• density

This can be released during a chemical change.

• Fireworks

• Energy

• Chemical reaction

• Chemical change

Dominic leaves a glass of water outside overnight. The next morning, the liquid has changed into a solid. Which of the following most likely caused this to occur? A Addition of heat B Addition of a gas C Removal of heat D Removal of a gas

• Addition of a gas

• Addition of heat

• Removal of heat

• Removal of a gas

An increase in temperature will cause which of the following?

• Water freezing

• Paper tearing

• Chocolate melting

• Ball rolling

Adding heat will result in which of the following changes?

• Solid to liquid

• Liquid to solid

• Gas to solid

• Gas to liquid

Which of the following describes a chemical change to a slice of bread that is the result of heat?

• The bread is cut.

• The bread is frozen

• The bread is dropped

• The bread is toasted

Changes in temperature can often cause a change in the state of matter of objects. A decrease in temperature causes which of the following to happen? A Liquids will boil. B Water will freeze. C Wax will melt. D Solids will turn to gas.

• Liquids will boil.

• Wax will melt

• Solids will turn to gas

• Water will freeze

_____________is never destroyed or created in chemical reactions.

• density

• color

• matter

• particles