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algol13
2 years ago
5

Tracy observes an organism that lives in a lake by her house. The organism has an internal skeleton, scales, fins, and gills. Th

e organism that Tracy observes is most likely a(n) _______. A. amphibian B. fish C. mammal D. reptile
Chemistry
2 answers:
andrey2020 [161]2 years ago
8 0
I'd say B. Its most likely a fish.
a_sh-v [17]2 years ago
5 0
The answer would be B. fish, because a fish is the only selection that has fins.
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3 years ago
The compound Xe(CF3)2 decomposes in afirst-order reaction to elemental Xe with a half-life of 30. min.If you place 7.50 mg of Xe
Irina-Kira [14]

Answer:

t=147.24\ min

Explanation:

Given that:

Half life = 30 min

t_{1/2}=\frac{\ln2}{k}

Where, k is rate constant

So,  

k=\frac{\ln2}{t_{1/2}}

k=\frac{\ln2}{30}\ min^{-1}

The rate constant, k = 0.0231 min⁻¹

Using integrated rate law for first order kinetics as:

[A_t]=[A_0]e^{-kt}

Where,  

[A_t] is the concentration at time t

[A_0] is the initial concentration

Given that:

The rate constant, k = 0.0231 min⁻¹

Initial concentration [A_0] = 7.50 mg

Final concentration [A_t] = 0.25 mg

Time = ?

Applying in the above equation, we get that:-

0.25=7.50e^{-0.0231\times t}

750e^{-0.0231t}=25

750e^{-0.0231t}=25

x=\frac{\ln \left(30\right)}{0.0231}

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6 0
3 years ago
According to the graph, which statement is true?
damaskus [11]
Nitrogen is the one
5 0
3 years ago
g Nitrogen in the atmosphere consists of two nitrogen atoms covalently bonded together (N2). Knowing that nitrogen is atomic num
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Explanation:

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Hence, when it chemically combines another nitrogen atom then as both the atoms are non-metals. So, sharing of electrons will take place.

Also, there is no difference in electronegativity of two nitrogen atoms. Hence, compound formed N_{2} is non-polar covalent in nature.

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3 years ago
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Vesna [10]

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Explanation:

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The products will contain the same atoms as there are in the reactants but the bonds will rearrange to form different substances.

Every chemical reaction is accompanied with absorption or release of energy.

3 0
2 years ago
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