
Unit 1 Chemistry Test Review
Flashcard
•
Chemistry
•
7th Grade
•
Practice Problem
•
Hard
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15 questions
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1.
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. It can often be reversed, such as ice melting into water.
2.
FLASHCARD QUESTION
Front
What is a phase change?
Back
A phase change is the transition of a substance from one state of matter to another, such as solid to liquid (melting), liquid to gas (evaporation), or gas to solid (deposition).
3.
FLASHCARD QUESTION
Front
Define a mixture.
Back
A mixture is a combination of two or more substances that are not chemically combined, meaning they retain their individual properties.
4.
FLASHCARD QUESTION
Front
How does temperature relate to molecular movement?
Back
The temperature of a substance is directly related to the average kinetic energy of its molecules; as the temperature increases, the molecules move faster.
5.
FLASHCARD QUESTION
Front
What happens to the temperature when molecular movement decreases?
Back
When molecular movement decreases, the temperature of the substance also decreases, indicating lower kinetic energy.
6.
FLASHCARD QUESTION
Front
What is the difference between a physical change and a chemical change?
Back
A physical change involves a change in physical properties without altering the chemical composition, while a chemical change results in the formation of new substances with different chemical properties.
7.
FLASHCARD QUESTION
Front
What are the three states of matter?
Back
The three states of matter are solid, liquid, and gas, each characterized by different molecular arrangements and energy levels.
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