Counting Atoms
Flashcard
•
Science
•
7th Grade
•
Practice Problem
•
Hard
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15 questions
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1.
FLASHCARD QUESTION
Front
What is a coefficient in a chemical formula?
Back
A coefficient is a number placed in front of a chemical formula that indicates how many molecules or atoms of that substance are present.
2.
FLASHCARD QUESTION
Front
In the compound C2H8O, how do you calculate the total number of atoms?
Back
Add the subscripts: 2 (C) + 8 (H) + 1 (O) = 11 total atoms.
3.
FLASHCARD QUESTION
Front
How many different elements are present in the compound C6H12O6?
Back
There are 3 different elements: Carbon (C), Hydrogen (H), and Oxygen (O).
4.
FLASHCARD QUESTION
Front
What is the total number of atoms in the compound 2B1F3?
Back
The total number of atoms is 2 (B) + 1 (B) + 3 (F) = 6 atoms.
5.
FLASHCARD QUESTION
Front
How do you identify the number of atoms in a compound?
Back
Count the total of all the atoms represented by the subscripts in the chemical formula.
6.
FLASHCARD QUESTION
Front
What does the subscript in a chemical formula represent?
Back
A subscript indicates the number of atoms of the element in the molecule.
7.
FLASHCARD QUESTION
Front
If a chemical formula has no subscript, what does that mean?
Back
It means there is one atom of that element in the molecule.
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