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sattari [20]
3 years ago
12

Perform the following calculations and give your answer with the correct number of significant figures of 10.5+11.62

Chemistry
1 answer:
Pavel [41]3 years ago
3 0
When it comes to addition of numbers the final answer should have the same number of decimal places as the least precise value or in other words the number with least number of decimal places
10.5 - has 1 decimal place
11.62 has 2 decimal places
add 10.5 + 11.62 = 22.12
the number with least number of decimal places is 10.5 with only 1 decimal place
therefore answer too should have 1 decimal place
22.12 rounded off to 1 decimal place is 22.1
answer is 22.1
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Can anyone help me on this please?
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The idea is that the "half-life" is a certain amount of time.  It's the time it takes for 'half' of the atoms in any sample of that particular unstable element to 'decay' ... their nuclei die, fall apart, and turn into nuclei of other elements.

Look over the table.  There are 4,500 atoms of this radioactive substance when the time is 12,000 seconds, and there are 2,250 atoms of it left when the time is ' y ' seconds.  Gosh ... 2,250 is exactly half of 4,500 !  So the length of time from 12,000 seconds until ' y ' is the half life of this substance !  But how can we find the length of the half-life ? ? ?

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So the length of time from 20,000 seconds until 95,000 seconds
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The length of time is (95,000 - 20,000) = 75,000 sec

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There it is !  THAT's the number we need.  We can answer the question now.

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==> ' y ' is one half-life later than 12,000 seconds

==> ' y ' = 12,000 + 25,000

         y   = 37,000 seconds  .

Check: 
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As I said earlier, this is not the simplest half-life problem I've seen.
You really have to know what you're doing on this one.  You can't
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