Chemical Reactions

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•
Science
•
7th Grade
•
Hard
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15 questions
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1.
FLASHCARD QUESTION
Front
What is a chemical reaction?
Back
A process where substances (reactants) undergo a transformation to form new substances (products).
2.
FLASHCARD QUESTION
Front
What are common signs that a chemical change has occurred?
Back
A chemical has turned a different color, bubbled, and/or changed temperature.
3.
FLASHCARD QUESTION
Front
How does heating affect the rate of a chemical reaction?
Back
Heating usually makes the reaction happen faster.
4.
FLASHCARD QUESTION
Front
What is the difference between a chemical change and a physical change?
Back
In a chemical change, a new substance is formed; in a physical change, no new substance is formed.
5.
FLASHCARD QUESTION
Front
What is a reactant?
Back
A substance that is present at the start of a chemical reaction and is consumed during the reaction.
6.
FLASHCARD QUESTION
Front
What is a product in a chemical reaction?
Back
A substance that is formed as a result of a chemical reaction.
7.
FLASHCARD QUESTION
Front
What is the law of conservation of mass?
Back
In a chemical reaction, mass is neither created nor destroyed; the mass of reactants equals the mass of products.
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