chemical changes

Which of the following is a sign that a chemical reaction has occurred?

• Formation of a gas

• Change in shape

• Dissolving

• melting

Which of the following is NOT an example of a physical change?

• crumpled paper

• shrunken clothing

• pencil sharpening

• rust

Fizzing, foaming and burning are all examples of

• Physical change.

• Chemical change.

When you break a cracker into pieces it is a...

• Physical changes.

• Chemical changes

Which of these is a result of a chemical change?

• A mixture

• A new substance

• A solution

• Melting or freezing

Water freezing

• Chemical Changes

• Physical Changes

Wood burned in a fireplace

• Chemical Changes.

• Physical Changes.

In a chemical change, particles that makeup two or more substances are _______________

One or more substances dissolve in another and cannot be easily separated.

• Solution.

• Solvent.

• Filteration

• Evaporation

Chemical or Physical Change?

• chemical.

• physical.