Elements, Compounds, and Mixtures
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•
Chemistry
•
8th Grade
•
Hard
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15 questions
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1.
FLASHCARD QUESTION
Front
What is an element?
Back
A pure substance that cannot be broken down into simpler substances by chemical means. Examples include hydrogen (H), oxygen (O), and gold (Au).
2.
FLASHCARD QUESTION
Front
What is a compound?
Back
A substance formed when two or more elements are chemically bonded together. Example: Water (H2O) is a compound made of hydrogen and oxygen.
3.
FLASHCARD QUESTION
Front
What is a mixture?
Back
A combination of two or more substances that are not chemically combined. Example: Saltwater is a mixture of salt and water.
4.
FLASHCARD QUESTION
Front
How many elements are in the compound Na2CO3?
Back
3 (Sodium, Carbon, and Oxygen).
5.
FLASHCARD QUESTION
Front
What is a pure substance?
Back
A material made of only one type of particle, which can be either an element or a compound.
6.
FLASHCARD QUESTION
Front
What distinguishes a compound from a mixture?
Back
A compound has a fixed composition and properties, while a mixture can vary in composition and retains the properties of its components.
7.
FLASHCARD QUESTION
Front
What is the chemical formula for table salt?
Back
NaCl (Sodium Chloride), which is a compound formed from sodium and chlorine.
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