Elements and Compounds Flashcard

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•
Science
•
7th 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. 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 chemically bond together in a fixed ratio.
3.
FLASHCARD QUESTION
Front
How many elements are in the chemical formula NaCl?
Back
There are 2 elements in the chemical formula NaCl: sodium (Na) and chlorine (Cl).
4.
FLASHCARD QUESTION
Front
How many hydrogen atoms are in the chemical formula CH₄?
Back
There are 4 hydrogen atoms in the chemical formula CH₄.
5.
FLASHCARD QUESTION
Front
How many oxygen atoms are in the chemical formula CO₂?
Back
There are 2 oxygen atoms in the chemical formula CO₂.
6.
FLASHCARD QUESTION
Front
What is the total number of atoms in the chemical formula NaCl?
Back
The total number of atoms in the chemical formula NaCl is 2 (1 sodium atom and 1 chlorine atom).
7.
FLASHCARD QUESTION
Front
What distinguishes elements from compounds?
Back
Elements are made up of the same type of atoms, while compounds are made up of different types of atoms.
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