Salter's Chemistry - Elements of life unit - Flashcards in A Level and IB Chemistry

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Created by: Charlotte
Created on: 13-04-11 16:53

1. 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?

36.0
37.0
35.5
36.5
35.0

1 of 13

2. What is alpha-decay?

emission of helium nuclei
emission of electrons
emission of energy

3. What is beta-decay?

emission of electrons
emission of helium nuclei
emission of energy

4. Half-life is...

the time taken for a species to break down to half its original volume
half the life of a radioactive species

5. Peaks on a mass spectrum are produced by...

fragments of the sample
fragments with a negative charge
fragments with a positive charge
whole molecules of the sample

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Comments

georgia gillett

Report Tue 19th April, 2011 @ 14:30

thanks this was useful

Krystal

Report Tue 18th October, 2011 @ 16:36

Thanks sooo much

Shanice

Report Sun 25th December, 2011 @ 19:42

thanks! merry xmas ;)

Qaleh

Report Mon 26th December, 2011 @ 13:42

Thank you :)

Report Mon 2nd April, 2012 @ 14:05

Good Job! :)

kel

Report Mon 14th May, 2012 @ 14:23

half life is: ''The time taken for half of the radioactive nuclei in a sample to decay''..please change

Devapriya Murukesan

Report Sun 18th November, 2012 @ 16:35

really good

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