In a sample of chlorine, 75% is chlorine with a relative atomic mass of 35 and 25% is chlorine with a relative atomic mass of 37. What is the average relative atomic mass?
35.5
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What is alpha-decay?
emission of helium nuclei
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What is beta-decay?
emission of electrons
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Half-life is...
the time taken for a species to break down to half its original volume
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Peaks on a mass spectrum are produced by...
fragments with a positive charge
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What is the bond angle in a molecule with a tetrahedral shape?
109 degrees
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What is the bond angle in a molecule with a triangular planar shape?
120 degrees
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The half-life of carbon-14 is 5730 years. How long will it take for the sample's count rate to decrease from 160 counts per minute to 40 counts per minute?
11460 years
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In the ionisation area of a mass spectrometer, the sample is 'bombarded' with electrons so that...
cations are formed
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What is an isotope?
atom with same number of protons, different number of neutrons
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