Question

pick all of the physical changes * 2 points
ice melting
butter melting
water boiling
magnesium burning
pick all of the chemical changes * 2 points
ice melting
butter melting
water boiling
magnesium burning
ice melting is a physical change because * 1 point
a new substance was made
melted ice is still water
paper burning is a chemical change because * 1 point
a new substance was made
melted ice is still water

Explanation:

1. Physical changes do not produce new substances. Ice melting, butter melting, and water boiling are state - changes of substances without forming new substances. Magnesium burning produces magnesium oxide, a new substance, so it is a chemical change.
2. For the reason of ice melting being a physical change, melted ice is still water, no new substance is formed.
3. Paper burning is a chemical change because new substances like carbon dioxide, water vapor, etc. are produced.

Answer:

1. Pick all of the physical changes: Ice melting, Butter melting, Water boiling
2. Pick all of the chemical changes: Magnesium burning
3. Ice melting is a physical change because: Melted ice is still water
4. Paper burning is a chemical change because: A new substance was made