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  1. Problems
  2. /Carbon and Its Compounds

Carbon and Its Compounds

Chemistry
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30 problems
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1.
You wash clothes in hard water. With soap, a grey scum forms and there is little lather.
High School (9–10), General · Reactions and Uses of Carbon CompoundsStemPy LabStemPy Lab
Easy
2.
Tristearin, a fat of molar mass 890 g/mol, reacts with sodium hydroxide: fat + 3 NaOH → 3 soap +…
High School (9–10), General · Reactions and Uses of Carbon CompoundsStemPy LabStemPy Lab
Hard
3.
Ethanol reacts with sodium: 2 Na + 2 C₂H₅OH → 2 C₂H₅ONa + H₂.
High School (9–10), General · Reactions and Uses of Carbon CompoundsStemPy LabStemPy Lab
Medium
4.
A bottle of vinegar says: 6 g of ethanoic acid in every 100 mL.
High School (9–10), General · Reactions and Uses of Carbon CompoundsStemPy LabStemPy Lab
Medium
5.
Two colourless liquids are in unlabelled bottles.
High School (9–10), General · Reactions and Uses of Carbon CompoundsStemPy LabStemPy Lab
Medium
6.
45 g of ethanoic acid is warmed with 46 g of ethanol and a few drops of concentrated sulphuric acid.
High School (9–10), General · Reactions and Uses of Carbon CompoundsStemPy LabStemPy Lab
Medium
7.
Say whether each change is combustion, oxidation, addition or substitution.
High School (9–10), General · Reactions and Uses of Carbon CompoundsStemPy LabStemPy Lab
Easy
8.
Find the percentage of carbon, by mass, in propyne, C₃H₄, and in propane, C₃H₈.
High School (9–10), General · Reactions and Uses of Carbon CompoundsStemPy LabStemPy Lab
Medium
9.
The flame of a gas stove is usually blue.
High School (9–10), General · Reactions and Uses of Carbon CompoundsStemPy LabStemPy Lab
Easy
10.
Ethanol burns as C₂H₅OH + 3 O₂ → 2 CO₂ + 3 H₂O.
High School (9–10), General · Reactions and Uses of Carbon CompoundsStemPy LabStemPy Lab
Medium
11.
Methanol, CH₃OH, has a molar mass of 32 g/mol.
High School (9–10), General · Hydrocarbons and NomenclatureStemPy LabStemPy Lab
Medium
12.
Write the structural formula of each, showing every bond to carbon.
High School (9–10), General · Hydrocarbons and NomenclatureStemPy LabStemPy Lab
Easy
13.
Give the name of each compound. CH₃CH₂Br (b) HCHO (c) CH₃CH₂CH₂CH₂CHO (d) CH₃CH₂COCH₂CH₃ (e)…
High School (9–10), General · Hydrocarbons and NomenclatureStemPy LabStemPy Lab
Medium
14.
Each hydrocarbon has no ring. Say whether it is an alkane, an alkene or an alkyne.
High School (9–10), General · Hydrocarbons and NomenclatureStemPy LabStemPy Lab
Medium
15.
Write the molecular formula of the alkene and of the alkyne that each have 9 carbon atoms.
High School (9–10), General · Hydrocarbons and NomenclatureStemPy LabStemPy Lab
Easy
16.
Is C₆H₁₂ saturated or unsaturated? How many hydrogen atoms is it short of the alkane with six…
High School (9–10), General · Hydrocarbons and NomenclatureStemPy LabStemPy Lab
Easy
17.
The boiling points of methane, ethane, propane, butane, pentane and hexane are 112 K, 185 K, 231 K…
High School (9–10), General · Hydrocarbons and NomenclatureStemPy LabStemPy Lab
Medium
18.
Which of these are alkanes? C₃H₈, C₄H₈, C₅H₁₂, C₆H₁₂, C₂H₂, C₉H₂₀, C₁₀H₂₀.
High School (9–10), General · Hydrocarbons and NomenclatureStemPy LabStemPy Lab
Easy
19.
Pentane, C₅H₁₂, has three isomers. A class draws five carbon skeletons for it: Five carbons in a…
High School (9–10), General · Hydrocarbons and NomenclatureStemPy LabStemPy Lab
Medium
20.
Write the formula of the alkane with 14 carbon atoms.
High School (9–10), General · Hydrocarbons and NomenclatureStemPy LabStemPy Lab
Easy
21.
A graphite rod of mass 18 g burns completely in oxygen.
High School (9–10), General · Covalent Bonding and AllotropesStemPy LabStemPy Lab
Medium
22.
Which form of carbon, diamond or graphite, suits each use best?
High School (9–10), General · Covalent Bonding and AllotropesStemPy LabStemPy Lab
Easy
23.
A chemist has 1.8 g of fullerene, C₆₀, whose molar mass is 720 g/mol.
High School (9–10), General · Covalent Bonding and AllotropesStemPy LabStemPy Lab
Medium
24.
The numbers of different alkanes with 7, 8, 9 and 10 carbon atoms are 9, 18, 35 and 75.
High School (9–10), General · Covalent Bonding and AllotropesStemPy LabStemPy Lab
Medium
25.
Carbon makes more than ten million compounds.
High School (9–10), General · Covalent Bonding and AllotropesStemPy LabStemPy Lab
Easy
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