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CHANGE IN SIGNEXPLANATIONSITUATIONPICTURE COLOR CHANGEWhen a chemical reaction occurs and the color changes from the original color to the new color. You need another reaction to reverse! When you dye your blonde hair purple, it changes from blonde to purple. To change it back you need another chemical reaction! ENERGY (LIGHT OR HEAT) EXCHANGE When a chemical reaction occurs, heat or light is taken in or given off (endothermic and exothermic reactions) When cooking chicken, I must add heat in order to make it safe to eat ODOR CHANGEWhen a chemical reaction occurs, a noticeable change in smell can be seen. When using Febreeze, Oxygen atoms bond to the smelly compounds and lifts the away so everything smells fresh
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SIGNS OF A CHEMICAL REACTION
FORMATION OF:SIGN EXPLANATION SITUATION PICTURE
GAS FORMATION When a chemical reaction occurs, two or more
substance chemically react and form a gas
When an alkali metal and water come together, one
of the products is Hydrogen gas
PRECIPITATE FORMATION When a chemical reaction occurs, two or more
substances chemically react and a solid “rains
down” / “falls out” of the reaction
when milk and vinegar are mixed together, the milk
curdles and substances fall out to the bottom of the
container
CHANGE INSIGN EXPLANATION SITUATION PICTURE
COLOR CHANGE When a chemical reaction occurs and the color
changes from the original color to the new color. You need another reaction to
reverse!
When you dye your blonde hair purple, it changes from
blonde to purple. To change it back you need
another chemical reaction!
ENERGY (LIGHT OR HEAT) EXCHANGE
When a chemical reaction occurs, heat or light is taken in or given off (endothermic and
exothermic reactions)
When cooking chicken, I must add heat in order to
make it safe to eat
ODOR CHANGE When a chemical reaction occurs, a noticeable change
in smell can be seen.
When using Febreeze, Oxygen atoms bond to the smelly compounds and lifts
the away so everything smells fresh
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