Grade 10 · Science · Chemistry

10th grade Empirical and molecular formulas worksheet

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Empirical and molecular formulas

Grade 10 Science Worksheet - Building Confidence

NameDate

Circle the best answer, or write your answer on the line.

Glucose, C₆H₁₂O₆, has 6 carbon atoms and 12 hydrogen atoms. How many H atoms are there for each C atom, Ari?
Table sugar, C₁₂H₂₂O₁₁, has 11 oxygen atoms and 22 hydrogen atoms. How many H atoms are there for each O atom, Bo?
3.
What is the empirical formula of glucose, C₆H₁₂O₆, Jun?
- C₃H₆O₃
- C₆H₁₂O₆
- CH₂O
4.
Is H₂O, water's formula, already an empirical formula, Luz?
- No: it simplifies to HO
- No: it must be doubled to H₄O₂
- Yes: 2 and 1 share no common factor but 1
5.
Is C₁₂H₂₂O₁₁, table sugar's formula, already an empirical formula, Milo?
- No: it simplifies to CHO
- Yes: 12, 22 and 11 share no factor above 1
- No: it simplifies to C₆H₁₁O₅
6.
Glucose's atoms come in the ratio 6 C : 12 H : 6 O. What is the simplest whole-number ratio, Noah?
- 3 : 6 : 3
- 1 : 2 : 1
- 6 : 12 : 6
7.
What number do you divide 6, 12 and 6 by to get glucose's simplest ratio, Pia?
- 6, their greatest common factor
- 12, the largest subscript
- 2, the first common factor you find
8.
Table sugar's ratio is 12 C : 22 H : 11 O. What is its simplest whole-number ratio, Ren?
- 12 : 22 : 11
- 6 : 11 : 5.5
- 1 : 2 : 1
9.
How many atoms of each element are in one unit of baking soda, NaHCO₃, Tala?
- 1 Na, 1 H, 1 C and 1 O
- 1 Na, 1 H, 1 C and 3 O
- 3 of each element
10.
How many atoms in total are in one glucose molecule, C₆H₁₂O₆, Zee?
- 18 atoms
- 3 atoms, one per element
- 24 atoms

Find empirical and molecular formulas. Every version has 10 questions, and the answer key prints on the second page.

I can read a formula's atom ratio and reduce it to the empirical formula (glucose C₆H₁₂O₆ → CH₂O).
I can turn lab grams into moles of atoms and then into a formula, and say why grams alone can't give a formula.
I can build a molecular formula from an empirical one with n = molar mass ÷ empirical mass.

Standard: none (TX)

empirical formula: The simplest whole-number ratio of atoms in a compound

molecular formula: The actual number of each atom in one molecule

greatest common factor: The largest number that divides every subscript

n: Molar mass ÷ empirical mass, a whole number

Your child divided the wrong way. Put the count you are finding on top: H atoms per C atom = H count ÷ C count.

Your child stopped before the simplest ratio. Divide every subscript by their greatest common factor: 6, 12, 6 become 1, 2, 1.

Your child changed the ratio. An empirical formula keeps every subscript in the same ratio, as whole numbers.

What is the most common mistake with empirical and molecular formulas?

Your child divided the wrong way. Put the count you are finding on top: H atoms per C atom = H count ÷ C count.

Are these 10th grade science worksheets free to print?

Yes. All 6 printable versions at each level are free to print, with the answer key, and no account is needed.

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