
Counting Atoms in Chemical Reactions

Interactive Video
•

Olivia Brooks
•
Science
•
6th - 8th Grade
•
Hard
10:07
Standards-aligned
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10 questions
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1.
MULTIPLE CHOICE
30 sec • 1 pt
What does a subscript in a chemical formula indicate?
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2.
MULTIPLE CHOICE
30 sec • 1 pt
If a chemical formula has no subscript next to an element, how many atoms of that element are present?
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3.
MULTIPLE CHOICE
30 sec • 1 pt
What role does a coefficient play in a chemical formula?
4.
MULTIPLE CHOICE
30 sec • 1 pt
How do you calculate the total number of atoms in a molecule using subscripts and coefficients?
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5.
MULTIPLE CHOICE
30 sec • 1 pt
In the formula 'P2O3', how many phosphorus atoms are present?
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6.
MULTIPLE CHOICE
30 sec • 1 pt
In a compound with the formula 'NO3' inside parentheses followed by a subscript '2', how many oxygen atoms are there?
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7.
MULTIPLE CHOICE
30 sec • 1 pt
For a molecule '4Zn(NO3)2', how many total nitrogen atoms are present?
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8.
MULTIPLE CHOICE
30 sec • 1 pt
How many total atoms are in '4Zn(NO3)2'?
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9.
MULTIPLE CHOICE
30 sec • 1 pt
In the formula 'Sr3(PO4)2', how many total atoms are present?
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10.
MULTIPLE CHOICE
30 sec • 1 pt
How many total atoms are in the molecule with the formula '2NH4NO3'?
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