What is an element?
Elements and Compounds Identification

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Science
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7th Grade
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Easy
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1.
FLASHCARD QUESTION
Front
Back
An element is a pure substance that cannot be broken down into simpler substances by chemical means. It consists of only one type of atom.
2.
FLASHCARD QUESTION
Front
What is a compound?
Back
A compound is a substance formed when two or more different elements are chemically bonded together. It has unique properties different from the individual elements.
3.
FLASHCARD QUESTION
Front
How can you identify an element from a chemical formula?
Back
An element is represented by a single chemical symbol (e.g., H for hydrogen), while a compound has two or more symbols (e.g., H2O for water).
4.
FLASHCARD QUESTION
Front
What does the subscript in a chemical formula indicate?
Back
The subscript indicates the number of atoms of the element in the molecule. For example, in H2O, the '2' indicates there are two hydrogen atoms.
5.
FLASHCARD QUESTION
Front
What is the difference between a chemical change and a physical change?
Back
A chemical change results in the formation of new substances with different properties, while a physical change does not alter the chemical composition of a substance.
6.
FLASHCARD QUESTION
Front
What is the chemical formula for sodium hydroxide?
Back
The chemical formula for sodium hydroxide is NaOH.
7.
FLASHCARD QUESTION
Front
How many different elements are in the compound CaHO2CH?
Back
There are 4 different elements in the compound CaHO2CH: Calcium (Ca), Hydrogen (H), Oxygen (O), and Carbon (C).
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