Chemical and Physical Changes

Physical and Chemical Changes

​Physical Changes

​Is when particles stay the same

​There is NO new substance

​Chemical Change

​particles change

​a NEW substance is formed

Multiple Choice

How do you know if a chemical place took change?

• The properties are different

• The particles look different

• There is more mass

• There is no evidence of a physical change

Multiple Choice

Which of the following describes a chemical change to a slice of bread resulting from adding heat?

• The bread is cut

• The bread is frozen

• The bread is dropped

• The bread is toasted

​Heat causes evaporation, the heat makes the liquid convert from a liquid to a gas

Multiple Choice

One morning, Caleb noticed tiny drops of water on the grass as he walked to school. That afternoon, he did not see any drops of water on the grass when he returned home. Which of the following best explains what happened to the drops of water?

• The heat from the air caused the water drops to boil.

• The sun heated the water and caused the drops to evaporate.

• The air cooled the water and caused the drops to freeze.

• The energy from the sun caused the water drops to condense.

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​How does heat effect the states of matter?

Multiple Choice

If you leave a block of ice outside in the middle of summer in Florida, it will _________?

• boil

• freeze

• melt

• condense

Multiple Choice

which of these has undergone a chemical change caused by a temperature chage

Multiple Choice

Which one of these is a chemical change?

• putting oil in a squeaking chait

• cooking eggs for breakfast

• sewing a pillow

• digging a hole in the yard

Multiple Choice

Which one of these is a physical change

• scrambling eggs in a bowl

• cooking scrambled eggs

• making a cake with eggs

​Evidence of a physical change:

​size change

​change of shape

​color change

​state change

(solid->liquid->gas)

​Evidence of a chemical change:

​new smell

​odor change

​sound produced

​temperature change

​light/sound produced

Multiple Choice

fruit rotting is an example of a

• physical change

• chemical change

​Chemical Change

​When metals are exposed to air and water they create a new substance called rust