Chemical & Physical Changes Review

When water in an open pan is heated for a long time, it becomes...

• a solid

• a vacuum

• a gas

• dew

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

Which of the following is an example of MELTING?

• stirring some sugar in water until you can't see the sugar

• heating a pan of water until the water is all gone

• heating a block of ice until the ice turns to water

• cooling water in the freezer until the water becomes solid

Tags

NGSS.MS-PS1-4

Iron is most likely to rust when it is

• damp

• dry

• painted

• covered with grease

Tags

NGSS.MS-PS1-2

Vinegar is an acid that bubble when it interacts with calcite.  Which mineral contains calcite? (Use the table below to answer.)

• limestone

• sandstone

• granite

• gneiss

Tags

NGSS.MS-PS1-2

Mark is observing a burning candle.  He notices that the candle wax makes a pool and dribbles down the side of the candle, where it hardens again.  The wax has undergone:

• a physical change

• a chemical change

• a physical and chemical change

• the formation of a new substance

Tags

NGSS.MS-PS1-2

A different chemical substance is formed when

• a cloth is cut

• a cup breaks

• a candle burns

• a piece of chalk falls apart

Tags

NGSS.MS-PS1-2

Which object would be most likely to rust?

• an iron nail

• a plastic comb

• a glass marble

• a paper cup

Tags

NGSS.MS-PS1-2

David added a little baking soda to a beaker that contained vinegar.  Bubbles started coming from the mixture and a gas was released.  The gas was evidence that:

• the mixture was starting to boil.

• the air in the flask contracted.

• the vinegar and baking soda expanded.

• a chemical reaction took place.

Tags

NGSS.MS-PS1-2

An example of a liquid turning into a gas is:

• a chocolate bar melting

• steam escaping from a cup of hot chocolate

• an ice cream cone dripping

• a stick of butter getting warm

Tags

NGSS.MS-PS1-4

If you dissolved a lot of salt in some water in a large, flat dish and put the dish in bright sunlight on a hot day, what would be left in the dish after a long time?

• dry salt

• water with no salt

• the same salty water as before

• nothing

Tags

NGSS.MS-ESS2-4