What is a physical change?
Chemical Reactions

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•
Chemistry
•
8th Grade
•
Hard
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1.
FLASHCARD QUESTION
Front
Back
A physical change is a change that affects one or more physical properties of a substance without altering its chemical composition. Example: Getting a haircut.
2.
FLASHCARD QUESTION
Front
What is a chemical change?
Back
A chemical change occurs when a substance transforms into a different substance with different properties. Example: Rust forming on metal.
3.
FLASHCARD QUESTION
Front
What is the formula to produce hydrogen gas?
Back
To produce hydrogen gas, you need a metal such as magnesium and an acid such as hydrochloric acid.
4.
FLASHCARD QUESTION
Front
What happens to a candle placed under a jar?
Back
The candle goes out as it uses up the oxygen and releases carbon dioxide.
5.
FLASHCARD QUESTION
Front
How many molecules are represented in the chemical formula H2O?
Back
There are 2 molecules of hydrogen and 1 molecule of oxygen in H2O.
6.
FLASHCARD QUESTION
Front
What is the difference between a physical change and a chemical change?
Back
A physical change does not change the substance's chemical identity, while a chemical change results in the formation of new substances.
7.
FLASHCARD QUESTION
Front
What is an example of a physical change?
Back
Examples of physical changes include melting ice, boiling water, and breaking glass.
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