Counting atoms

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•
Science
•
7th Grade
•
Hard
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1.
FLASHCARD QUESTION
Front
What is an atom?
Back
An atom is the smallest unit of matter that retains the properties of an element.
2.
FLASHCARD QUESTION
Front
What is a molecule?
Back
A molecule is a group of two or more atoms bonded together.
3.
FLASHCARD QUESTION
Front
How do you count the total number of atoms in a chemical formula?
Back
Add the subscripts of each element in the formula. If there is no subscript, it is assumed to be 1.
4.
FLASHCARD QUESTION
Front
In the formula ClN₆Fe₂, how many total atoms are there?
Back
9 (1 Cl + 6 N + 2 Fe = 9 total atoms).
5.
FLASHCARD QUESTION
Front
What does the subscript in a chemical formula indicate?
Back
The subscript indicates the number of atoms of that element in the molecule.
6.
FLASHCARD QUESTION
Front
How many atoms are in H₂SO₄?
Back
7 (2 H + 1 S + 4 O = 7 total atoms).
7.
FLASHCARD QUESTION
Front
What is the significance of parentheses in chemical formulas?
Back
Parentheses indicate that the enclosed group of atoms is a subunit that can be multiplied by a coefficient.
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