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garri49 [273]
3 years ago
7

Hi :) can someone answer this thank u

Chemistry
1 answer:
scoray [572]3 years ago
3 0
Add all the carbon atoms (3) then add hydrogen atoms (8)
C3H8
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The amount of a harmful chemical to which a person is exposed is the ____.
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A. dose
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highlight why it is important to evaluate important assessment studies before any development could be made on the environment​
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Answer:

Essentially, an EIA is designed to identify the potential risks of a project (e.g., infrastructure development such as a dam) to environmental and human well-being and identify measures to eliminate and/or mitigate these risks. This can be done by replacing and/or modifying planned activities to reduce impacts

Explanation:

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2 years ago
a mixture contains two or more substances that are physically combined and there is no electron bonding
crimeas [40]


True.

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4 0
3 years ago
Suppose you find a rock that contains some potassium-40 (half-life of 1.3 billion years). you measure the amount and determine t
Alborosie
Equation for Half life :
A = a(0.5)^(t/h)
A is current amount, "a" is initial amount, h is halflife, t is time

5 = 40(0.5)^(t/1.3x10^9)
5/40 = (0.5)^(t/1.3x10^9)
take the log of both sides , power rule
Log(5/40) = (t/1.3x10^9) * Log(0.5)
(1.3x10^9) * Log(5/40) / Log(0.5) = t
3.9x10^9 years = t

And if you think about what a half life is, the time it take for the amount to reduce to half.
40/2 = 20
20/2 = 10
10/2 = 5
It went through 3 half-lifes
3 * 1.3x10^9 = 3.9x10^9 years

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3 years ago
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5 0
3 years ago
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