What is the law of conservation of mass?
Physical and chemical changes

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•
Science
•
7th Grade
•
Hard
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15 questions
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1.
FLASHCARD QUESTION
Front
Back
The law of conservation of mass states that matter cannot be created or destroyed in a chemical reaction; it can only change forms.
2.
FLASHCARD QUESTION
Front
What happens to hot air compared to cooler air?
Back
Hot air rises because it is less dense than cooler air.
3.
FLASHCARD QUESTION
Front
What is an exothermic reaction?
Back
An exothermic reaction is a chemical reaction that releases heat, causing the temperature of the surroundings to increase.
4.
FLASHCARD QUESTION
Front
What is evidence of a chemical change?
Back
Evidence of a chemical change can include gas production, color change, temperature change, or odor change.
5.
FLASHCARD QUESTION
Front
What is density?
Back
Density is the mass of a substance divided by its volume, often described as how heavy something is for its size.
6.
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.
7.
FLASHCARD QUESTION
Front
What is a chemical change?
Back
A chemical change occurs when a substance transforms into a different substance with different properties.
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