Chemical Reactions
Flashcard
•
Science
•
8th Grade
•
Practice Problem
•
Easy
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15 questions
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1.
FLASHCARD QUESTION
Front
What is an element?
Back
An element is a pure substance that cannot be broken down into simpler substances by chemical means. It consists of only one type of atom.
2.
FLASHCARD QUESTION
Front
What is a pure substance?
Back
A pure substance is a material that has a constant composition and consistent properties throughout. Examples include elements and compounds.
3.
FLASHCARD QUESTION
Front
What is a compound?
Back
A compound is a substance formed when two or more elements chemically bond together in a fixed ratio. Example: Water (H2O) is a compound made of hydrogen and oxygen.
4.
FLASHCARD QUESTION
Front
What is a mixture?
Back
A mixture is a combination of two or more substances where each retains its own properties. Mixtures can be homogeneous or heterogeneous.
5.
FLASHCARD QUESTION
Front
What is a homogeneous mixture?
Back
A homogeneous mixture is a mixture in which the components are uniformly distributed, and you cannot see the individual parts. Example: Saltwater.
6.
FLASHCARD QUESTION
Front
What is a heterogeneous mixture?
Back
A heterogeneous mixture is a mixture in which the components are not uniformly distributed, and you can see the different parts. Example: Salad.
7.
FLASHCARD QUESTION
Front
What is the difference between a physical change and a chemical change?
Back
A physical change alters the form of a substance but not its chemical composition (e.g., melting ice). A chemical change results in the formation of new substances (e.g., rusting iron).
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