Which of the changes are chemical changes? a. Candle wax is melted. b. A candle is burned. c. A silver teapot turns black. d. Two clear colorless salt solutions are mixed and a bright orange precipitate forms. e. Sugar crystals are ground to a fine powder.

• A candle is burned

• Your silver teapot turns black

• Two clear colorless salt solutions are mixed and a bright orange precipitate forms.

Explanation:

A chemical change results from a chemical reaction of the species involved. Examples of chemical changes are burning, cooking, rusting etc.

Physical change when matter changes forms but not chemical identity. Examples of physical changes are boiling, melting, freezing, evaporation etc.

for step 7 table c on the lab "newtons law of action"   the average time it took the car to travel .25 meters   was 1.92 seconds.

the average time it took the car to travel 0.50 meters was 2.61 seconds

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