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Yanka [14]
3 years ago
9

Which of the following statements is true? Hydroelectric power plants do not impact the environment.

Chemistry
2 answers:
Andrej [43]3 years ago
7 0
Most of the world's population lives in industrial areas.
Maru [420]3 years ago
5 0

Answer:

Fossil fuels take millons of years to form

Explanation:

Fossil fuels are organic compounds derived from carbon. They come from the slow decomposition of the organic matter that inhabited the planet millions of years ago, such as animals and plants.

This process takes millions of years, and that is why they are cataloged as non-renewable fuels.

The other answers are incorrect because hydroelectric plants generally produce noise, which is cataloged as a negative environmental impact.

It cannot be assured that the majority of the world's population lives in industrial areas. And finally, the production of electricity in the U.S. cannot have remained constant since 1940 due to the constant growth of its population.

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What does a mole of iron weigh
r-ruslan [8.4K]

As the atomic mass of iron is 55.847u

We say that it is the mass of one mole of iron.

By formula it can be find by

No.of mole=mass in g/molar mass

Mass in gram = no.of mole x molar mass

No.of mole =1

Molar mass = 55.847g

Mass in gram = 1x55.847

= 55.847g of Fe

3 0
3 years ago
Calculate how many grams of oxygen form when each quantity of reactant completely reacts.. . 2HgO----->2Hg+O2
goblinko [34]
<span>6.96g HgO
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3 years ago
Select the options that are properties of electromagnetic waves:
kaheart [24]

Answer:

They propagate in materialistic media and non-materialistic media ( space ) .

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They consist of vibrating electric and magnetic fields at certain frequency in phase with each other , perpendicular to each other and perpendicular to the direction of the wave propagation ...

Explanation:

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4 0
3 years ago
There are several different models that represent compounds. One type of model is shown.
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A) structural formula

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4 0
2 years ago
Read 2 more answers
Consider a 0.12 M solution of a weak polyprotic acid (H2A) with the possible values of Ka1 and Ka2 given here. Calculate the con
tatuchka [14]

The  [H3O+] in step 1 is 0.0034 M while the  [H3O+] in step 2 is 0.00039 M

<h3>What is the contribution of each  step?</h3>

Let us set up the ICE table in each case, for K1;

         H2A(aq) + H2O(l)-------->   H3O^+(aq) + HA^-(aq)

I        0.12                                     0                    0

C       -x                                        +x                   +x

E      0.12 - x                                x                     x

Ka1= [H3O^+] [HA^-]/[ H2A]

Ka1= x^2/  0.12 - x  

1.0×10^−4 = x^2/  0.12 - x  

1.0×10^−4(0.12 - x ) = x^2

1.2 * 10^-5 - 1.0×10^−4x =  x^2

x^2 +  1.0×10^−4x - 1.2 * 10^-5  = 0

x =0.0034 M

[H3O+] = 0.0034 M

Again;  [H3O+] = [HA^-] = 0.0034 M

          HA^-(aq) + H20(l)    -------> A^-(aq)   + H3O^+

I       0.0034                                  0               0

C       -x                                          + x            +x

E    0.0034 - x                               x                x

Ka2= [A^-] [H3O^+]/[HA^-]

5.0×10^−5 = x^2/ 0.0034 - x  

5.0×10^−5 (0.0034 - x ) = x^2

1.7 * 10^-7 - 5.0×10^−5x =  x^2

x^2 + 5.0×10^−5x - 1.7 * 10^-7 = 0

x=0.00039 M

Learn more about the dissociation of a polyprotic acid:brainly.com/question/14481763

#SPJ1

7 0
1 year ago
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