Unit 1 Review: Elements, Compounds, and Chemical Changes
Flashcard
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Chemistry
•
6th Grade
•
Practice Problem
•
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 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 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 ice or crumpling paper.
4.
FLASHCARD QUESTION
Front
What is a chemical change?
Back
A chemical change is a change that results in the formation of new chemical substances. Examples include rusting iron or burning wood.
5.
FLASHCARD QUESTION
Front
What is a subscript in a chemical formula?
Back
A subscript is a small number written below and to the right of a chemical symbol in a formula, indicating the number of atoms of that element in a molecule.
6.
FLASHCARD QUESTION
Front
What is the smallest building block of matter?
Back
The smallest building block of matter is an atom. Atoms combine to form molecules and compounds.
7.
FLASHCARD QUESTION
Front
What is the difference between a mixture and a compound?
Back
A mixture is a combination of two or more substances that are not chemically bonded, while a compound is a substance formed from two or more elements that are chemically bonded.
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