Chemical Equations Review
Authored by Spencer Austin
Chemistry
10th - 12th Grade
reaction type covered
Used 3+ times
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69 questions
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1.
MULTIPLE CHOICE QUESTION
2 mins • 1 pt
How many hydrogen atoms are in this chemical formula:
4 hydrogen atoms
1 hydrogen atom
2 hydrogen atoms
3 hydrogen atoms
Answer explanation
Remember, the coefficient tells you how many molecules there are, and the subscript tells you how many atoms there are per molecule!
Tags
formulas
2.
MULTIPLE CHOICE QUESTION
2 mins • 1 pt
How many molecules are in this chemical formula?
4 Molecules
6 Molecules
2 Molecules
5 Molecules
Answer explanation
Remember, the coefficient tells you how many molecules there are, and the subscript tells you how many atoms there are per molecule!
Tags
formulas
3.
MULTIPLE CHOICE QUESTION
2 mins • 1 pt
How many Iron (Fe) atoms are in this chemical formula?
2 iron atoms
6 iron atoms
5 iron atoms
4 iron atoms
Answer explanation
Remember, the coefficient tells you how many molecules there are, and the subscript tells you how many atoms there are per molecule!
Tags
formulas
4.
MULTIPLE CHOICE QUESTION
2 mins • 1 pt
How many oxygen atoms are in this chemical formula?
6 oxygen atoms
2 oxygen atoms
3 oxygen atoms
4 oxygen atoms
Answer explanation
Remember, the coefficient tells you how many molecules there are, and the subscript tells you how many atoms there are per molecule!
Tags
formulas
5.
MULTIPLE CHOICE QUESTION
2 mins • 1 pt
How many molecules are in this chemical formula?
5 molecules
4 molecules
2 molecules
6 molecules
Answer explanation
Remember, the coefficient tells you how many molecules there are, and the subscript tells you how many atoms there are per molecule!
Tags
formulas
6.
MULTIPLE CHOICE QUESTION
2 mins • 1 pt
Is this balanced?...
Fe + S --> FeS
YES!
NO!
Answer explanation
Remember, an equation is balanced if the same number of atoms of EVERY element exist as a reactant and as a product.
Tags
balancing
7.
MULTIPLE CHOICE QUESTION
2 mins • 1 pt
How many atoms of aluminum are on each side of the following equation: 4Al + 3O2 --> 2Al2 O3
2
6
1
4
Answer explanation
Remember, the coefficient tells you how many atoms or molecules there are, and the subscript tells you how many atoms there are per molecule!
Tags
balancing
formulas
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