Chemistry Unit 2

Flashcard
•
Science
•
7th Grade
•
Hard
Wayground Content
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15 questions
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1.
FLASHCARD QUESTION
Front
Is burning wood a chemical or physical change?
Back
Chemical change: A process where substances combine or break apart to form new substances.
2.
FLASHCARD QUESTION
Front
What is the process that turns a liquid into a gas?
Back
Evaporation: The process where liquid molecules gain enough energy to enter the gas phase.
3.
FLASHCARD QUESTION
Front
2H₂ + O₂ ----> ? What is the product?
Back
2H₂O: Water is produced when hydrogen and oxygen react.
4.
FLASHCARD QUESTION
Front
When a substance changes from one state of matter to another, what is this called?
Back
Phase Change: The transition of a substance from one state (solid, liquid, gas) to another.
5.
FLASHCARD QUESTION
Front
A substance made up of repeating patterns of molecule subunits is called?
Back
Extended structure: A material with a long-range order in its molecular arrangement.
6.
FLASHCARD QUESTION
Front
What is a chemical reaction?
Back
A process that leads to the transformation of one set of chemical substances to another.
7.
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.
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