Unit 2: Element, Compound, Mixture
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•
Chemistry
•
7th Grade
•
Hard
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14 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 substance formed when two or more elements chemically bond together. For example, water (H2O) is a compound made of hydrogen and oxygen.
3.
FLASHCARD QUESTION
Front
What is a mixture?
Back
A mixture is a combination of two or more substances that are not chemically bonded. Examples include air, salad, and sand and salt.
4.
FLASHCARD QUESTION
Front
What is the difference between a compound and a mixture?
Back
A compound has a fixed composition and properties, while a mixture can vary in composition and retains the properties of its individual components.
5.
FLASHCARD QUESTION
Front
What is a homogeneous mixture?
Back
A homogeneous mixture is a mixture that has a uniform composition throughout. An example is saltwater.
6.
FLASHCARD QUESTION
Front
What is a heterogeneous mixture?
Back
A heterogeneous mixture is a mixture that does not have a uniform composition. An example is a salad or a mixture of sand and pebbles.
7.
FLASHCARD QUESTION
Front
What is a chemical change?
Back
A chemical change is a process that involves the transformation of one or more substances into different substances. Examples include rusting iron and burning wood.
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