Unit 3: Chemical and Physical Changes
What is a mixture?
A substance made by mixing other substances together.
Is color change an example of physical or chemical change?
Chemical.
Is combing hydrogen and oxygen to make water physical or chemical?
Chemical.
Is breaking a stick physical or chemical?
Physical.
What is a chemical reaction?
The process of chemical change.
What is chemical change?
When something's chemical composition changes to create or destroy a substance. Examples: metal rusting, baking a cake, lighting a match
Why is metal rusting a chemical change?
Because metal combined with outside moisture creates the rust.
An odor is produced.
Chemical change.
Formation of gas is an example of...
Chemical change.
Gasoline being ignited is...
Chemical change.
Precipitate forms.
Chemical change.
The size of a substance changed.
Physical change.
Water evaporating from the ocean surface is an example of...
Physical change.
What is crushing a peanut into peanut butter?
Physical change.
Anything to do with changing something's properties of matter is...
Physical.
Is freezing water into an ice cube physical or chemical?
Physical.
What is physical change?
When something's size, shape, or anything other related to matter changes. Examples: freezing or boiling water, cutting a cake, crushing a can
What subatomic particle is responsible for chemical reactions?
Electrons, specifically valence electrons.
Cutting something in half.
Physical change.
Are exploding fireworks physical or chemical?
Chemical.
