revission

Chemical changes..

• Always form a new substance.

• May change shape or size.

• May change colour, produce odor, create sound, release gas or produce light.

• May absorb or release heat.

 

Physical Changes...

• Do not form a new substance.

• Can often be undone.

• May absorb or release heat.

• May change state of matter.

 

Mixing and dissolving are examples of reversible change.

• TRUE

• FALSE

Q. 

Rusting is an irreversible change.

• TRUE

• FALSE

Which tools are best for separating a mixtures of sand, iron filings, and water?

• Hot plate and filter

• Filter and magnet

• Tweezers and filter

All of the following are examples of containers filled with mixtures EXCEPT -

• a jar filled with trail mix

• a glass filled with lemonade

• a bowl of cereal with milk

• a cup of fruit salad