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3 years ago

Which phrase is the best definition for the word common in environmental science?

2 answers:

7 0

I believe that the best definition of the word common in environmental science is a typical resource. A typical resource is a resource that is not hard to find and is very common. The answer to the question will hence be A.
The answer could not be the other three choices because a shared resource is a resource that is used by more than one organism in the environment. A worthless resource is one that has no use in the environment while a rare resource is one that is hard to find.

Margaret [11]3 years ago

6 0

Answer:

B is correcta-moundo

Explanation:

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Iron oxide + oxygen equals to ?

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Answer:

It's ferric oxide Fe2O3

Explanation:

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romanna [79]

Answer:

300.0+\-0.1

Explanation:

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2 years ago

Non-ferrous alloys do not contain a. copper. b. brass. c. gold. d. iron.

Elena L [17]

Iron is the correct answer

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3 years ago

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Iodine-131 is a beta emitter used as a tracer in radio immunoassays in biological systems. It follows first order kinetics. The

allsm [11]

Answer: The amount of Iodine-131 remain after 39 days is 0.278 grams

Explanation:

The equation used to calculate rate constant from given half life for first order kinetics:

$t_{1/2}=\frac{0.693}{k}$

where,

$t_{1/2}$ = half life of the reaction = 8.04 days

Putting values in above equation, we get:

$k=\frac{0.693}{8.04days}=0.0862days^{-1}$

Rate law expression for first order kinetics is given by the equation:

$k=\frac{2.303}{t}\log\frac{[A_o]}{[A]}$

where,

k = rate constant = $0.0862days^{-1}$

t = time taken for decay process = 39 days

$[A_o]$ = initial amount of the sample = 8.0 grams

[A] = amount left after decay process = ?

Putting values in above equation, we get:

$0.0862=\frac{2.303}{39}\log\frac{8.0}{[A]}$

$[A]=0.278g$

Hence, the amount of Iodine-131 remain after 39 days is 0.278 grams

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3 years ago

An agent of weathering where liquid water seeps into the cracks of rocks is called?

babunello [35]

Answer:

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3 years ago

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