Choose a Sign
Explore the common signs that a chemical reaction is happening.
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Gas is Produced
Bubbles appear
Vinegar + baking soda makes gas (bubbles).
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Light is Produced
Flame appears
Striking a match produces light and heat.
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Temperature Changes
Temp goes up
Calcium carbide + water releases heat.
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Color & Odor Change
Spoilage happens
Food changes color and smell over time.
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Solid Forms
Precipitate appears
Two liquids react and form a solid.
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