Chemistry 9701/23 — October/November 2012
Cambridge AS Level · AS Level Structured Questions · worked solutions for every part, with the mark scheme
Topics Atoms, Molecules and Stoichiometry · Nitrogen and Sulfur · Equilibria · Hydroxy Compounds · Carbonyl Compounds · Hydrocarbons · +5 more
Carbon dioxide, CO2, makes up about 0.040 % of the Earth’s atmosphere. It is produced by animal respiration and by the combustion of fossil fuels.
In animal respiration, oxygen reacts with a carbohydrate such as glucose to give water, carbon dioxide and energy.
The typical daily food requirement of a human can be considered to be the equivalent of 1.20 kg of glucose, C6H12O6.
You should express all of your numerical answers in this question to three significant figures.
Construct a balanced equation for the complete oxidation of glucose.
Use your equation to calculate the amount, in moles, of CO2 produced by one person in one day from 1.20 kg of glucose.
On the day on which this question was written, the World population was estimated to be .
Calculate the total mass of CO2 produced by this number of people in one day. Give your answer in tonnes. [1 tonne = g]
When fossil fuels are burned in order to give energy, carbon dioxide and water are also produced.
The hydrocarbon octane, C8H18, can be used to represent the fuel burned in motor cars.
A typical fuel-efficient motor car uses about 4.00 dm3 of fuel to travel 100 km.
Construct a balanced equation for the complete combustion of octane.
The density of octane is 0.700 gcm–3.
Calculate the amount, in moles, of octane present in 4.00 dm3 of octane.
Calculate the mass of CO2 produced when the fuel-efficient car is driven for a distance of 100 km.
Calculate how many kilometres the same fuel-efficient car would have to travel in order to produce as much CO2 as is produced by the respiration of people during one day. Use your answer to (a)(iii).
Carbon dioxide is one of a number of gases that are responsible for global warming. When fossil fuels such as octane are burned in a car engine, other atmospheric pollutants are also produced.
Give the formula of one atmospheric pollutant that may be produced in a car engine, other than CO2, and state how this pollutant damages the environment.
pollutant .................................
damage caused ......................................................................
The rest of this paper
4 more questions- Q2Group 17 · Atoms, Molecules and Stoichiometry · Equilibria14M
- Q3Nitrogen and Sulfur · Equilibria · Reaction Kinetics12M
- Q4Hydroxy Compounds · Carbonyl Compounds · Carboxylic Acids and Derivatives · Electrochemistry12M
- Q5Introduction to Organic Chemistry · Carbonyl Compounds · Hydroxy Compounds8M