Lesson 3.1.2.4
3.1.2.4 Empirical and molecular formula Quiz: AQA Chemistry, Unit 1
20 questions
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Lesson 3.1.2.4, Empirical and molecular formula: 20 multiple choice questions for the AQA Chemistry (7405), Unit 1: Physical chemistry, written with Revision Ninja.
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The 20 questions
-
Which phrase defines the empirical formula of a chemical compound?
- Simplest atom ratio
- Total compound mass
- Percentage mass composition
- Actual atom count
-
Which phrase defines the molecular formula of a compound?
- Simplest atom ratio
- Actual atom count
- Relative formula mass
- Percentage mass ratio
-
Which compound has the empirical formula CH2?
- C2H6
- C2H4
- CH4
- C3H8
-
What is the empirical formula of glucose, C6H12O6?
- C6H12O
- CHO
- CH2O
- C2H4O2
-
What is the relationship between empirical formula and molecular formula?
- Fractional multiple
- Whole-number multiple
- Inverse proportion
- Exact same value
-
What is the initial calculation step when finding an empirical formula from mass data?
- Find total compound mass
- Convert masses to moles
- Divide masses by volume
- Multiply masses by Ar
-
A compound has Mr = 60 and empirical formula CH2O. What is its molecular formula?
- C2H4O2
- C3H6O3
- C4H8O4
- CH2O
-
A compound contains 40.0% C, 6.7% H and 53.3% O by mass. What is its empirical formula?
- CHO2
- C2H4O2
- CH4O
- CH2O
-
A compound contains 2.40 g of magnesium and 1.60 g of oxygen. What is its empirical formula?
- MgO2
- Mg3O2
- Mg2O
- MgO
-
A compound contains 52.2% C, 13.0% H and 34.8% O by mass. What is its empirical formula?
- C4H12O2
- CH3O
- C2H3O
- C2H6O
-
A compound has empirical formula CH and Mr = 78. What is its molecular formula? (Ar: C = 12, H = 1)
- C6H6
- C4H4
- C2H2
- CH
-
A compound contains 0.12 g of carbon and 0.02 g of hydrogen. What is its empirical formula?
- CH2
- CH
- CH4
- C2H
-
A hydrocarbon has empirical formula CH2 and Mr = 56. What is its molecular formula?
- C3H6
- C5H10
- C2H4
- C4H8
-
A 3.20 g sample of an element forms 4.00 g of its oxide. What is the mass of oxygen combined with it?
- 1.20 g
- 7.20 g
- 3.20 g
- 0.80 g
-
What is the empirical formula of ethane, C2H6?
- C2H6
- CH3
- C3H9
- C2H3
-
A compound contains 85.7% C and 14.3% H by mass and has Mr = 56. What is its molecular formula?
- C4H8
- C2H4
- C6H12
- C3H6
-
A compound has empirical formula C2H5 and Mr = 58. What is its molecular formula?
- C6H15
- C2H5
- C3H7
- C4H10
-
A compound contains 1.20 g of carbon, 0.20 g of hydrogen and 0.80 g of oxygen. What is its empirical formula?
- C2H4O
- CH2O
- C2H4O2
- C4H8O
-
What property is required to calculate a molecular formula from an empirical formula?
- Empirical percentage composition
- Gas molar volume
- Avogadro constant
- Relative molecular mass
-
A compound contains 49.3% C, 6.9% H and 43.8% O by mass. What is its empirical formula? (Ar: C = 12, H = 1, O = 16)
- CH2O
- C2H4O
- C3H5O2
- C3H6O2
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