Physical and chemical changes
Flashcard
•
Science
•
7th Grade
•
Practice Problem
•
Hard
Wayground Content
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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. Examples include melting, freezing, and dissolving.
2.
FLASHCARD QUESTION
Front
What is a chemical change?
Back
A chemical change is a change that results in the formation of new chemical substances. It involves making or breaking bonds between atoms. Examples include burning, rusting, and digestion.
3.
FLASHCARD QUESTION
Front
What is the law of conservation of mass?
Back
The law of conservation of mass states that matter cannot be created or destroyed in a chemical reaction. The mass of the reactants must equal the mass of the products.
4.
FLASHCARD QUESTION
Front
What is an exothermic reaction?
Back
An exothermic reaction is a chemical reaction that releases energy in the form of heat. This causes the temperature of the surroundings to increase.
5.
FLASHCARD QUESTION
Front
What is an endothermic reaction?
Back
An endothermic reaction is a chemical reaction that absorbs energy from its surroundings, resulting in a decrease in temperature.
6.
FLASHCARD QUESTION
Front
What evidence indicates a chemical change has occurred?
Back
Evidence of a chemical change includes color change, temperature change, gas production, and the formation of a precipitate.
7.
FLASHCARD QUESTION
Front
What happens to the temperature during an exothermic reaction?
Back
During an exothermic reaction, the temperature of the surroundings increases as heat is released.
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