Welcome to the Quiz!
This quiz contains 11 questions from a mix of 1 subtopics.
Which of the following conditions are necessary for halogens to react with alkanes?
presence of a catalyst
high temperature
presence of ultraviolet light
high pressure
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What type of reaction occurs when a halogen reacts with an alkane?
addition
rearrangement
substitution
elimination
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In the photochemical halogenation of alkanes, what is the role of ultraviolet light?
to prevent side reactions
to break the carbon-hydrogen bond in the alkane
to stabilise the halogenoalkane product
to provide the activation energy to start the reaction
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What happens during the initiation step of the free radical mechanism?
UV light produces reactive radicals
the alkane molecule is attacked by a halogen radical
radicals join to form stable molecules
radicals react in a chain reaction
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In the reaction between methane and chlorine, what is the primary product formed when there is an excess of methane?
chloromethane
tetrachloromethane
trichloromethane
dichloromethane
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What do the letters CFC stand for?
chlorofluorocycles
chlorofluorochains
chlorofluorocarbons
chlorofluorocompounds
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Which of the following is an example of a CFC?
CHCl3
CCl3F
CH3Cl
CH2Cl2
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What is the primary role of ozone in the upper atmosphere?
to absorb harmful ultraviolet radiation from the sun
to trap heat and maintain Earth's temperature
to protect Earth from meteors and space debris
to reflect visible light back to Earth
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How do CFCs damage the ozone layer?
they absorb ultraviolet light, preventing ozone formation
they trap heat in the upper atmosphere, causing ozone to decompose
they produce reactive chlorine radicals that catalyse ozone destruction
they react directly with ozone molecules
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In the propagation step of ozone depletion by CFCs, what is the overall reaction?
2O3 ➔ 3O2
O3 ➔ O2
O3 + O2 ➔ 2O2
3O3 ➔ 2O2
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To maximise the yield of a desired halogenoalkane in a free radical halogenation reaction, which of the following should be used?
equal amounts of alkane and halogen
a catalyst
excess alkane relative to the halogen
excess halogen relative to the alkane
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