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dsp73
2 years ago
6

Which is the correct Lewis dot structure of NH2? A.A B.B C.C D.D E.E

Chemistry
2 answers:
TiliK225 [7]2 years ago
7 0
The answer i got is D!!
Anarel [89]2 years ago
5 0

I think D is your answer

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Compared with the fibers of cotton plants growing today, what is the relative ratio radioactivity in the old material vs the rel
TiliK225 [7]

Answer:

0.56

Explanation:

From the formula;

0.693/t1/2 = 2.303/t log (Ao/At)

t1/2 = half life of the C-14 = 5730 y

t = time elapsed = 4800 y

At = Activity of C-14 at time t

Ao= Activity of a living C-14 sample

0.693/5730 = 2.303/4800 log (Ao/At)

1.2 * 10^-4 = 4.8 * 10^-4 log (Ao/At)

log (Ao/At) = 1.2 * 10^-4/4.8 * 10^-4

log (Ao/At) = 0.25

Ao/At = Antilog (0.25)

Ao/At = 1.778

Hence;

At/Ao = (1.778)^-1

At/Ao = 0.56

7 0
3 years ago
Discuss the advantages and disadvantages of using hydropower for large-scale energy production.
mario62 [17]

The advantages of the hydropower are:

- It is renewable

- It is a clean source of energy

- Matches current demand

- It is stable and reliable

- Requires low operating cost

The disadvantages of the hydropower are:

- Causes environmental damage

- Cost of building is expensive

- May cause droughts

- May cause floods in lower areas

- Shortage of water supply

The hydroelectric power has its prons and cons. It is very expansive for building, and it causes environmental damage in the river systems, but it also causes hazards like droughts and floods at certain areas. On the other side, once established it is very cheap, and it gets the job done when it comes to electricity. It is also an energy that is not polluting, and it is sustainable, reliable, and renewable.

4 0
2 years ago
Light energy comes from
Travka [436]

Answer:

The sun

Explanation:

3 0
2 years ago
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A student develops the list shown below that includes laboratory equipment and materials for constructing a voltaic cell.
PSYCHO15rus [73]
Well this answer is not true and is false
3 0
3 years ago
What do you think caused the balloon to expand
Anna71 [15]
Pressure on the inside of the balloon was greater than the pressure on the outside of the balloon so it pushed out until the pressures equalized.
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3 years ago
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