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WorksheetsCounting Atoms
Total questions: 20
Worksheet time: 11mins
Number of Carbon atoms in 2Na₂CO₃
H2SO4
We breathe oxygen. Its chemical formula is O2. Is this formula an element or a compound?
element
compound
neither
both
How many elements are in this chemical formula?
NaOH
1
2
3
4
How many atoms are in the formula?
NaOH
4
3
2
1
H2SO4
H = 2, S = 4, O = 4
H = 2, S = 1, O = 4
H = 8, S = 4, O = 4
H = 2, SO = 4
How many atoms are present if there is no subscript following the element symbol?
0
2
only 1
1 million
O is the chemical symbol for what element?
Osmium
Odell
Oxygen
Mrs. Powers and Mrs. Kitzel are baking a cake and they need to use baking soda. How many atoms of each element are in baking soda? (NaHCO3)
6 Sodium atoms,
6 Hydrogen atoms,
6 Carbon atoms,
6 Oxygen atoms
1 Sodium atom,
1 Hydrogen atom,
1 Carbon atom,
1 Oxygen atom
1 Sodium atom
1 Hydrogen atom
1 Carbon atom
3 Oxygen atoms.
1 Sodium atom, 1 Hydrogen atom, 1 Carbon atom
Elliot and Beau are working on a chemistry project. They need to find out how many atoms of aluminum are in this formula: 2Al₂O₃
2
1
4
6
What does the following represent?
coefficient
subscript
elements
Coefficients in chemical formulas...
Multiply just the first atom
Add to the subscripts at the end of the molecule
Multiply elements without subscripts
Multiply EVERYTHING!
How many atoms of Hydrogen are in this compound?
1
2
3
4
Which of the following is NOT a compound?
