Lesson 18C.1
18C.1 Deducing formulae from data Quiz: Pearson Edexcel Chemistry, Unit 18
20 questions
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Lesson 18C.1, Deducing formulae from data: 20 multiple choice questions for the Pearson Edexcel Chemistry (9CH0), Unit 18: Organic Chemistry III, written with Revision Ninja.
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The 20 questions
-
Which products are formed by complete combustion of a hydrocarbon in excess oxygen?
- CO and H2O
- CO2 and H2
- C and H2O
- CO2 and H2O
-
Which technique provides the molecular ion peak needed to find relative molecular mass?
- NMR spectroscopy
- Thin-layer chromatography
- Infrared spectroscopy
- Mass spectrometry
-
A combustion of an organic compound produces 0.440 g of CO2. How many moles of carbon were in the sample?
- 0.0100 mol
- 0.0050 mol
- 0.440 mol
- 0.0200 mol
-
The same combustion produces 0.180 g of H2O. How many moles of hydrogen atoms were in the sample?
- 0.180 mol
- 0.0400 mol
- 0.0100 mol
- 0.0200 mol
-
A compound is 40.0% carbon, 6.7% hydrogen and 53.3% oxygen by mass. What is its empirical formula?
- C2H4O2
- CH2O
- C3H6O3
- CH4O
-
A compound has an empirical formula CH2O and a relative molecular mass of 60. What is its molecular formula?
- C3H8O
- C2H4O2
- C4H8O
- CH2O
-
A compound gives an orange precipitate with 2,4-DNPH but does not react with Tollens' reagent. What is it most likely to be?
- A carboxylic acid
- An alkene
- A ketone
- An aldehyde
-
A hydrocarbon has an empirical formula C2H5 and a relative molecular mass of 58. What is its molecular formula?
- C4H10
- C3H8
- C2H5
- C6H15
-
What is the percentage by mass of oxygen in a compound that is 52.2% carbon and 13.0% hydrogen, by difference?
- 65.2%
- 34.8%
- 13.0%
- 47.8%
-
A compound is 52.2% C, 13.0% H and 34.8% O. What is its empirical formula?
- C3H8O
- CH3O
- C4H12O2
- C2H6O
-
Why are element masses divided by relative atomic masses in empirical formula calculations?
- To calculate moles
- To calculate mass
- To determine volume
- To find density
-
How is a molecular formula related to an empirical formula?
- Square root
- Always identical
- Half the value
- Whole-number multiple
-
A compound has empirical formula C2H4O and relative molecular mass 88. What is its molecular formula?
- C4H10O2
- C3H6O2
- C2H4O
- C4H8O2
-
Which spectrum provides the relative molecular mass of an organic compound?
- Carbon-13 NMR spectrum
- Infrared spectrum
- Proton NMR spectrum
- Mass spectrum
-
Which technique shows a strong absorption near 1700 cm⁻¹ for a C=O bond?
- Infrared spectroscopy
- Proton NMR spectroscopy
- Carbon-13 NMR spectroscopy
- Mass spectrometry
-
What does the ratio of peak areas in a proton NMR spectrum indicate?
- Total molecular mass
- Relative proton numbers
- Bond strength values
- Carbon atom count
-
What is the empirical formula of a compound with 0.0120 mol C and 0.0240 mol H?
- CH3
- CH
- CH2
- C2H
-
Which gas is produced when a compound containing only C, H and O is burnt completely?
- Sulfur dioxide
- Carbon dioxide
- Carbon monoxide
- Hydrogen
-
A compound with empirical formula CH2O has an unknown molecular ion. Which molecular mass gives C2H4O2?
- 120
- 30
- 90
- 60
-
A compound contains 0.60 g C, 0.10 g H and 0.80 g O. What is its empirical formula?
- C2H4O
- CH4O2
- CH2O
- CH3O
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