Chemical Reactions

Flashcard
•
Chemistry
•
KG - 8th 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) change into new substances (products) by breaking and forming bonds.
2.
FLASHCARD QUESTION
Front
What are reactants in a chemical reaction?
Back
The starting substances that undergo change during a chemical reaction.
3.
FLASHCARD QUESTION
Front
What are products in a chemical reaction?
Back
The new substances formed as a result of a chemical reaction.
4.
FLASHCARD QUESTION
Front
What is a sign of a chemical change?
Back
Unexpected color change, temperature change, formation of a precipitate.
5.
FLASHCARD QUESTION
Front
What is a physical change?
Back
A change that affects one or more physical properties of a substance without changing its chemical composition.
6.
FLASHCARD QUESTION
Front
How many atoms of an element are in a compound represented as XnYm?
Back
The number of atoms of element X is represented by 'n' and of element Y by 'm'.
7.
FLASHCARD QUESTION
Front
What does it mean when a substance loses transparency?
Back
It is often a sign of a physical change, not a chemical change.
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