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Chemistry
N5 Chemistry
Nuclear chemistry
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Cards (19)
What is nuclear chemistry the study of?
Break up of unstable nuclei
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How does nuclear chemistry change unstable nuclei?
It transforms them into more stable nuclei
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What does the stability of a nucleus depend on?
Proton
to
neutron
ratio
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What do radioactive isotopes change in a nucleus?
Neutron
to
proton ratio
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What are the three types of radiation?
Alpha
,
Beta
,
Gamma
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What is an alpha particle?
A slow moving
positively charged
particle
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How are alpha particles attracted?
To the
negative plate
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What is a beta particle?
A fast moving
negatively
charged particle
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How is a beta particle formed?
When a
neutron
splits into a
proton
and
electron
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What can beta particles penetrate?
Thin
metal
foil
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What are gamma waves?
Electromagnetic
radiation from the
nucleus
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What stops gamma rays?
Thick
lead
or
concrete
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What is nuclear fusion?
The combining of
nuclei
to form a
heavier
nucleus
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What is nuclear fission?
The splitting of a heavy
nucleus
into lighter nuclei
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What is half-life?
The time taken for half of a
radioactive
sample to decay
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If a radioisotope has a half-life of 30 minutes, how long will it take for a sample to decay?
Depends on the
initial mass
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If a 1g sample of a radioisotope has an activity of 32 counts/sec, what is the activity of a 2g sample?
It would take
longer
to decay
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What happens to the activity of Carbon-14 over time?
It decreases as it
decays
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What is the half-life of Carbon-14?
5730
years
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