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faust18 [17]
4 years ago
14

Which sentences describe disadvantages of burning fossil fuels instead of using hydrogen fuel cells? a burning fossil fuels cont

ributes to climate change. b burning fossil fuels takes place inside expensive fuel cells. c fossil fuels aren’t widely available, but pure hydrogen is. d fossil fuels are nonrenewable.?
Chemistry
1 answer:
guapka [62]4 years ago
3 0
A.) burning fossil fuels contributes to climate change.
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Compound decomposes through the following unbalanced reaction in acidic media: MnO2→ MnO4-(s) + Mn2+(s) Balance this reaction an
choli [55]

Answer:

C) MnO₂

Explanation:

If we write the semi equations (this is, for reduction and oxidation) we will have:

Oxidation: 2MnO₂ → MnO₄⁻ + Mn⁺²

Reduction: 2H₂O → H₂ + 2OH⁻

Then the final global reaction (just adding the two above hemi chemical reactions):

2MnO₂ + 2H₂O → MnO⁻₄ + Mn⁺² + H₂ + 2OH⁻ (in acidic media)

So, we have Mn⁺⁴ (from MnO₂) goes to Mn⁺⁷ and Mn⁺² (this is, Mn is oxidated) and H⁺ (from acidic media or H₂O) goes to H₂ (this is, it is reduced). So the reducing agent would be MnO₂

7 0
4 years ago
Which choice is an element? Question 2 options: air (N2 mixed with O2 , and CO2 ) sodium chloride (NaCl) oxygen (O2 ) water (H2O
Ber [7]

Answer:

oxygen (O2 )

Explanation:

7 0
3 years ago
At standard temperature and pressure, what is the volume of one mole of gas?
Stells [14]

Answer:

A. 22.41

Explanation:

goodluck man, just typing a little bit more for the 20 words

6 0
3 years ago
Complete the following: layers: Earth as _____: Sun
Maslowich

Answer:

D. Gas

Explanation:

The correct option is D.

Just like the sun, there is a layer of the earth that is gas. It is known as the atmosphere.

The earth's atmosphere is known to be a layer of gases that are surrounded by the earth and retained by the earth's gravity. The gases in the earth actually contain roughly 78% nitrogen, 21% oxygen, 0.97% argon and carbon dioxide, 0.04% trace amounts of other gases, and water vapor. This combination of gases is commonly called air.

5 0
3 years ago
Identify the molecule with the highest boiling point. C 6H 6 NH 3 OF 2 CHCl 3
lakkis [162]

Answer:

Option NH 3 is the correct answer.

Explanation:

A molecule which has hydrogen bonding will have the highest boiling point. So, out of the given options only NH 3 will have hydrogen bonding.

Whereas in CHCI 3 there will be dipole-dipole interactions and no hydrogen bonding within the molecule.

In OF 2 and C 6H 6, there will be dipole-dipole interaction in both the molecules.

Thus, we can conclude that NH 3 will have the highest boiling point.

7 0
4 years ago
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