Counting Atoms

Flashcard
•
Chemistry
•
8th Grade
•
Hard
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15 questions
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1.
FLASHCARD QUESTION
Front
What is the chemical formula for water?
Back
H₂O
2.
FLASHCARD QUESTION
Front
How many atoms are in one molecule of H₂O?
Back
3 (2 Hydrogen atoms and 1 Oxygen atom)
3.
FLASHCARD QUESTION
Front
What does a subscript in a chemical formula indicate?
Back
The number of atoms of the element in the molecule.
4.
FLASHCARD QUESTION
Front
How many total atoms are in 4H₂O?
Back
12 (8 Hydrogen atoms and 4 Oxygen atoms)
5.
FLASHCARD QUESTION
Front
If a chemical symbol has no subscript, how many atoms does it represent?
Back
1 atom.
6.
FLASHCARD QUESTION
Front
How many Chlorine atoms are in 10MgCl₂?
Back
20 (10 Magnesium atoms and 20 Chlorine atoms)
7.
FLASHCARD QUESTION
Front
What is the total number of atoms in Al₂O₃?
Back
5 (2 Aluminum atoms and 3 Oxygen atoms)
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