
Pre retest Physical and Chemical Changes
Flashcard
•
Science
•
8th Grade
•
Practice Problem
•
Hard
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15 questions
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1.
FLASHCARD QUESTION
Front
What is a chemical change?
Back
A chemical change is a process where substances combine or break apart to form new substances, resulting in a change in chemical composition.
2.
FLASHCARD QUESTION
Front
What is a physical change?
Back
A physical change is a change that affects one or more physical properties of a substance without altering its chemical composition.
3.
FLASHCARD QUESTION
Front
What is a sign that a chemical reaction has occurred?
Back
Formation of a gas, change in color, temperature change, or the formation of a precipitate.
4.
FLASHCARD QUESTION
Front
Which of the following is NOT a physical change: crumpling paper, dissolving sugar in water, freezing water, or burning a marshmallow?
Back
Burning a marshmallow is NOT a physical change; it is a chemical change.
5.
FLASHCARD QUESTION
Front
What happens to molecules during a chemical change?
Back
Molecules break apart and form new molecules, resulting in the creation of new substances.
6.
FLASHCARD QUESTION
Front
What is density?
Back
Density is the mass of a substance divided by its volume, often expressed in grams per cubic centimeter (g/cm³).
7.
FLASHCARD QUESTION
Front
How can you identify a physical change?
Back
A physical change can be identified if the substance retains its original properties and no new substances are formed.
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