Physical and Chemical Changes

The diagram below shows changes happening to water in a specially shaped bottle.  What changes did the water undergo? 

• melting and then freezing
• freezing and then evaporation
• condensation and then melting
• evaporation and then condensation

Which describes water vapor leaving a river and going into the air? 

• condensation
• evaporation
• precipitation
• runoff

To see an atom, which of these could be used? 

• the human eye
• a magnifying glass
• an electron microscope
• a classroom microscope

A glass of hot water is sitting on a table. Which is true about the glass of hot water once a spoonful of salt has been completely dissolved in it? 

• It weighs more 
• It weighs less
• It weighs the same
• none of these

A mixture of sand and gravel can be separated by putting it in a container with holes that only the sand can pass through. This method works to separate the mixture because sand and gravel differ in which physical property?

• texture

• state of matter

• color

• size

Which of the following is NOT a clue that a chemical change has occurred? 

• change of state of matter
• color change
• production of a gas
• production of heat

The particles in a _____ are the farthest apart and move the fastest.

• gas
• solid
• banana
• liquid

A physical change occurs when a substance _____. 

• breaks into individual elements
• becomes a new substance
• changes from an acid to a base
• changes shape, size, and form

Mark is observing a burning candle. He notices the melted wax drips down the side of the candle and hardens again. The candle has _____. 

• formed a new substance
• undergone a physical change
• undergone a chemical change
• undergone a physical and chemical change

A chemical change creates a _________. 

• change in volume
• new substance
• mixture
• solution