What is a compound?
Elements

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Science
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7th Grade
•
Hard
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1.
FLASHCARD QUESTION
Front
Back
A compound is a substance formed when two or more elements are chemically bonded together. For example, water (H2O) is a compound made of hydrogen and oxygen.
2.
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. Each element is made up of atoms of the same type.
3.
FLASHCARD QUESTION
Front
What is the smallest unit of an element?
Back
The smallest unit of an element is an atom.
4.
FLASHCARD QUESTION
Front
What is the smallest unit of a compound?
Back
The smallest unit of a compound is a molecule.
5.
FLASHCARD QUESTION
Front
What is a chemical symbol?
Back
A chemical symbol is a one or two-letter abbreviation used to represent an element. For example, 'H' stands for hydrogen and 'O' stands for oxygen.
6.
FLASHCARD QUESTION
Front
What is the difference between an atom and a molecule?
Back
An atom is the smallest unit of an element, while a molecule is the smallest unit of a compound, made up of two or more atoms bonded together.
7.
FLASHCARD QUESTION
Front
Can a compound be made of the same element?
Back
No, a compound must consist of two or more different elements. For example, O2 is a molecule but not a compound because it consists of only one type of element (oxygen).
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