APES: Math Review

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11 Terms

1
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Percent Change

NOO x 100

  • ((new-old)/old) x 100)

  • That’s your percentage! No need to convert!

2
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Turning % to decimal

  • Divide by 100

    or

  • Move decimal two places to the left

3
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Finding Percentage of Percentage

Convert both to decimals and multiply by each other

4
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Net Primary Productivity

GPP-RL

5
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Energy Availability in Trophic Levels

  • Moving Down: Multiply by 10

  • Moving Up: Divide by 10

6
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Percent Growth Rate

(CBR-CDR)/10

  • That’s you percentage! No need to convert!

7
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Doubling Time

70/growth rate (%)

  • DO NOT convert percentage

8
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kWh

1000 watts of power used for 1 hour

9
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Half-Life

amount in years that it takes for half of mass of a radioactive element to decay

10
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How to find remaining mass?

Ex: How much of 100g sample of Uranium would be left after 2,112,000,000 years?

  • Half Life: 704 million years

(Given Initial Mass, Half Life, and Years)

  1. Find how many half lives the sample will go through

    • (years/half-life)

  2. Divide the sample by 2 that many times

11
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How to find half-life?

Ex: Calculate the half-life of Plutonium that a 28 gram sample decays to a mass of 3.5 grams over 42 years

(Given Intial Mass, Final Mass, & Years)

  1. Divide the sample by 2 until you get the mass it decayed to

  2. Calculate how many half lives that was (the amount you divided by)

  3. Divide the half-lives by the years it has decayed over