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WorksheetsChemistry Paper 2
Total questions: 49
Worksheet time: 25mins
What is a reversible reaction?
A reaction where the products of the reaction can react to produce further products
A reaction where the products of the reaction can react to product the original reactants
When a reversible reaction occurs in a sealed reaction vessel, when is equilibrium reached?
When all the reactants are used up
When the amounts of products and reactants are equal
When the rates of the forward and reverse reactions are equal
How does a catalyst increase a reaction's rate?
It shifts the position of the equibirum
It increases the energy of the reactants
It provides a different reaction pathway that has a lower activation energy
Which of these reactions would be faster?
Magnesium with concentrated hydrochloric acid
Magnesium with dilute hydrochloric acid
The rate of a reaction doesn't depend on the.....
frequency of collisions
volume of solution
temperature of the reactants
True or false? A reversible reaction always takes in more energy in one direction than it gives out in the opposite direction.
True
False
True or false? Increasing the temperature of a reversible reaction will increase the yield of the exothermic reaction
True
False
Which of the following is not a unit of reaction rate?
g/s
cm3/s
g/dm3
The above equation shows a reversible reaction where A-D are different gases. If the pressure were increased, which reaction would be favoured?
Forwards
Backwards
True or false? The mean rate of reaction can be found by measuring the amount of reactant used over a period of time.
True
False
Which of the following is a reason why increasing the temperature increases the rate of a reaction?
The reactant particles evaporate to form a gas
The reactant particles move faster so they collide more frequently
The reactant particles stick together more
What effect does adding a catalyst have on the overall energy change of a reaction?
It increases it
It decreases it
It has no effect
In a reaction between marble and hydrochloric acid, using small marble chips instead of a large piece of marble will produce...
no difference in the rate of reaction
a faster rate of reaction
a slower rate of reaction
What effect will decreasing the temperature have on the yield of the exothermic reaction in a reversible reaction?
Increase it
Decrease it
Have no effect
Which of the following affects the proportion of collisions that have enough energy for particles to react?
Gas pressure
Temperature
Concentration
Calculate the mean rate of reaction for a reaction between calcium and water where 10.2cm3 of hydrogen is collected in the first 20 seconds.
1.96cm3/s
0.51cm3/s
204cm3/s
0.51s/cm3
Crude oil is a...
renewable resource
finite resource
infinite resource
What is the general formula of an alkane?
CnH2n
CnH2n+2
C2H6
What happens to bromine water when an alkene is added to it?
It turns cloudy
It turns from colourless to orange
It turns from orange to colourless
Which of the methods below could be used to crack a long-chain hydrocarbon?
Mix the hydrocarbon with water and add a cold platinum catalyst
Mix the hydrocarbon vapour with steam and heat to a very high temperature
What happens to the carbon and hydrogen in a fuel when it's burned?
They are oxidised
They evaporate
They react to form CH4
True or false? Cracking is used to turn long-chain hydrocarbons into short-chain hydrocarbons.
True
False
Which of the following alkanes will have the highest boiling point? Decane (C10H22) or petane (C5H12)?
Decane
Pentane
What is the test for hydrogen gas?
It burns with a green flame
It turns damp litmus paper white
It burns with a pop
When carbon dioxide is bubbled through limewater, the limewater turns...
cloudy
green
yellow
True or false? Formulations are made for a specific purpose by mixing together exact amounts of different compounds.
True
False
You can check if a substance is pure by...
testing its melting point
using universal indicator solution
shaking it with limewater
In chemistry, what is a pure substance?
A substance in its natural state
a substance that only contains one compound or element
How many different phases are used in chromatography?
1
2
3
Why is sulphur often removed from fuels before they are burnt?
So the fuel produces less soot when it burns
To reduce the cost of the fuel
To reduce acid rain
Which of these is not produced when a fuel undergoes complete combustion?
Carbon monoxide
Carbon dioxide
Water
Which of these is causing the average global temperature to rise?
An increasing amount of greenhouse gases in the atmosphere
An increased amount of particulates in the atmosphere from car exhausts
Large amounts of sulphur dioxide gas being released from burning fuels
It is difficult to be certain what the implications of global climate change will be because....
the evidence has not been peer reviewed
the Earth's climate is very complicated so is hard to model
media reports are biased
Which of the following is formed mainly from shells and skeletons of marine organisms?
Limestone
Coal
Crude oil
Which of these gases is not a greenhouse gas?
Water vapour
Methane
Oxygen
What percentage of the Earth's atmosphere is made up of oxygen?
About 80%
About 20%
Less than 1%
True or false? Greenhouse gases in the atmosphere help to keep temperatures on Earth high enough to support life.
True
False
True or false? We can reduce the carbon footprint of the power we use by using nuclear energy instead of fossil fuels.
True
False
Solid particles in the atmosphere block some sunlight from reaching the Earth's surface. What is this effect called?
Global warming
Global dimming
Shadowing
Carbon monoxide is...
a toxic gas
a greenhouse gas
a cause of acid rain
Which of the following is not a reason carbon dioxide levels decreased in the Earth's early atmosphere?
The formation of sedimentary rocks and fossil fuels that contain carbon
The carbon dioxide reacted with oxygen in the atmosphere
Algae and plants began to photosynthesise
Greenhouse gases....
absorb all wavelengths of radiation
absorb short wavelength radiation from the sun
absorb long wavelength radiation from the Earth
The main goal of a life cycle assessment is to assess....
the total environmental cost of a product
the economic impact of a product
how long a product will be in use
Why is bioleaching used to extract copper from its ore?
It's quicker than electrolysis
It produces copper with fewer impurities than the copper produced by electrolysis
It can be used on low grade ores
What is phytomining?
A process that uses displacement reactions to extract copper
A process that uses bacteria to separate metals from low grade ores
A process that uses plants to separate metals from low grade ores
What is the first stage in making fresh water safe to drink?
Filtration
Distillation
Sterilisation
Which of the following is an example of a renewable resource?
Copper
Wool
Nuclear fuel such as uranium
True or false? Potable water must contain no dissolved salts.
True
False
Which process produces sewage sludge and effluent during sewage treatment?
Screening
Aerobic biological treatment
Sedimentation
