Page 25 - Science Course 3 (Book 2)
P. 25
Mo8-L2: Key Concept Check
Direction: Put a check mark in the correct column to show if a chemical reaction has occurred in each
situation. Then explain your reasoning for each situation with a check mark in the Yes
column.
Has a chemical reaction taken place? Yes No What indicates that a chemical
reaction might have occurred?
1. Bright copper turns green when it is
placed in air.
2. A f ref y gives off light when it f ies in the
backyard.
3. Water changes to ice when it is placed
in the freezer.
4. A nail rusts when it is left out in the rain
for two days.
5. Meat begins to smell after it sits in the
hot sun for a few hours.
6. Cookie dough baking in the oven gives
off a sweet smell.
7. Water vapor that hovers over a pot of
boiling water condenses into drops of
water
8. A piece of wood is carved into the
shape of a baseball bat.
9. Fireworks explode in the night sky
10. A half-eaten apple begins to turn
brown after a short while.
11. Two liquids combine, and a brightyellow
substance forms in the bottom
of the container.
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