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Ksenya-84 [330]
3 years ago
5

Why is the water cycle called a cycle and not a system?

Chemistry
1 answer:
alexira [117]3 years ago
5 0
It is called a cycle because it is repetitive, therefore making it a cycle (or almost never ending)
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How many atoms of h are in 1 mol of (nh42so4?
dem82 [27]
1 mole of NH42SO4 contains 42 moles of H. We take the 42 moles of H and multiply that times Avogadro's number (6.02x10^23) and get 2.5284x10^25 atoms of hydrogen
8 0
3 years ago
What type of substances dissolve most readily in water
svp [43]
The substances which dissolve most readily in water are called soluble substances and they are likely those substances which have the same polarity as water.
4 0
3 years ago
What is the quantity of carbon-14 in a bone after 17,190 years if the initial mass of C-14 is 0.300 grams and the half-life is 5
Licemer1 [7]

Answer:

A. 0.038 g.

Explanation:

  • The decay of carbon-14 is a first order reaction.
  • The rate constant of the reaction (k) in a first order reaction = ln (2)/half-life = 0.693/(5730 year) = 1.21 x 10⁻⁴ year⁻¹.

<u><em>The integration law of a first order reaction is:</em></u>

<em>kt = ln [Ao]/[A]</em>

k is the rate constant = 1.21 x 10⁻⁴ year⁻¹.

t is the time = 17,190 years.

[Ao] is the initial concentration of carbon-14 = 0.300 g.

[A] is the remaining concentration of carbon-14 = ??? g.

∵ kt = ln [Ao]/[A]

∴ (1.21 x 10⁻⁴ year⁻¹)(17,190 years) = ln (0.300 g)/[A]

2.08 =  ln (0.300 g)/[A]

Taking exponential for both sides:

8.0 = (0.300 g)/[A]

<em>∴ [A] = 0.0375 g ≅ 0.038 g</em>

4 0
3 years ago
The rate of disappearance of hbr in the gas phase reaction 2hbr(g)→h2(g)+br2(g) is 0.140 m s-1 at 150°c. the rate of appearance
VMariaS [17]
<span>Answer: 0.070 m/s

Explanation:

1) balanced chemical equation:

given: 2HBr(g) → H2 (g)+Br2(g)

2) Mole ratios:

2 mol HBr : 1 mol H2

3) That means that every time  2 moles of HBr disappear 1 mol of H2 appears.

That is, the H2 appears at half rate than the HBr disappears.

∴ rate of appearance of H2 = rate of disappearance of HBr / 2 = 0.140 m/s / 2 =  0.070 m/s, which is the answer.</span>
4 0
2 years ago
A car traveling at a constant speed goes around a sharp curve. Is the car accelerating? Explain.
Neporo4naja [7]
The answer is: Yes, the car is accelerating because it is changing direction as it goes around the curve.

- Because the direction of motion of an object even if the object is maintaining a constant speed still count as acceleration.

- Acceleration is a change in velocity, either in its magnitude i.e speed or in its direction or both.

- So, In a uniform circular motion, the direction of the velocity changes constantly, So there is always an associated acceleration, even though the speed might be constant.

-So when you go around a sharp curve if you hold the wheel steady during a turn and move at constant speed, you are in uniform circular motion. What you notice is a sideways acceleration because you and the car are changing direction.
7 0
2 years ago
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