Elements, Compounds, Mixtures

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•
Science
•
8th Grade
•
Hard
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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. Examples include hydrogen (H), oxygen (O), and gold (Au).
2.
FLASHCARD QUESTION
Front
What is a compound?
Back
A compound is a pure substance formed when two or more elements chemically combine in fixed proportions. Examples include water (H2O) and carbon dioxide (CO2).
Tags
NGSS.MS-PS1-1
3.
FLASHCARD QUESTION
Front
What is a mixture?
Back
A mixture is a combination of two or more substances that are not chemically bonded. The components retain their individual properties. Examples include salad and air.
4.
FLASHCARD QUESTION
Front
What is a homogeneous mixture?
Back
A homogeneous mixture is a mixture in which the composition is uniform throughout. Examples include saltwater and vinegar.
5.
FLASHCARD QUESTION
Front
What is a heterogeneous mixture?
Back
A heterogeneous mixture is a mixture in which the components are not uniformly distributed and can be easily distinguished. Examples include a bowl of fruit and sand.
6.
FLASHCARD QUESTION
Front
What is the difference between a pure substance and a mixture?
Back
A pure substance has a constant composition and distinct properties, while a mixture contains two or more substances that retain their individual properties.
7.
FLASHCARD QUESTION
Front
What does the chemical formula CO represent?
Back
CO represents carbon monoxide, which is a compound made of one carbon atom and one oxygen atom.
Tags
NGSS.MS-PS1-1
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