
Class assignment
Flashcard
•
Science
•
7th Grade
•
Practice Problem
•
Hard
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1.
FLASHCARD QUESTION
Front
What is a chemical reaction?
Back
A process where substances (reactants) transform into new substances (products) with different properties.
2.
FLASHCARD QUESTION
Front
What are reactants in a chemical equation?
Back
Substances that undergo a chemical change in a reaction, found on the left side of the equation.
3.
FLASHCARD QUESTION
Front
What are products in a chemical equation?
Back
Substances that are formed as a result of a chemical reaction, found on the right side of the equation.
4.
FLASHCARD QUESTION
Front
What does it mean for a chemical equation to be balanced?
Back
It means that the number of atoms of each element is the same on both sides of the equation.
5.
FLASHCARD QUESTION
Front
What is the law of conservation of mass?
Back
In a chemical reaction, mass is neither created nor destroyed; it is conserved.
6.
FLASHCARD QUESTION
Front
What is an example of a physical change?
Back
Melting ice is a physical change because it changes state but not chemical composition.
7.
FLASHCARD QUESTION
Front
What is an example of a chemical change?
Back
Burning wood is a chemical change because it produces new substances like ash and smoke.
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