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Effectus [21]
3 years ago
14

Fossil fuels are considered useful to humans because they are

Chemistry
2 answers:
Verdich [7]3 years ago
8 0
Fossil fuels are considered useful to humans because they are made by natural process by the decomposition of buried dead organisms. Coal, crude, oil And natural gas are fossil fuels that are the currently energy sources of the world.
ad-work [718]3 years ago
3 0

Fossil fuels are important because these products create fuel, gasoline for cars, jet fuel, heating oil and natural gas used to generate electricity.

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When an electron falls from an excited state to ground state, is energy released or absorbed?
strojnjashka [21]

Answer:

Energy is released.

Explanation:

When an electron absorbs energy, it moves up into an excited state. When it releases energy, it will return to the ground state.

5 0
3 years ago
3Fe+4H2O(yields) Fe3O4+4H2. What is the mole ratio of Fe3O4 to Fe?
WINSTONCH [101]

<u>Answer:</u> The correct answer is Option A.

<u>Explanation:</u>

Mole ratio is defined as the ratio between the stoichiometric coefficients of the molecules present in the chemical reaction.

For the given balanced chemical equation:

3Fe+4H_2O\rightarrow Fe_3O_4+4H_2

By Stoichiometry of the reaction:

3 moles of iron metal reacts with 4 moles of water to produce 1 mole of iron oxide and 4 moles of hydrogen gas.

The mole ratio of Fe_3O_4:Fe=1:3

Hence, the correct answer is Option A.

7 0
3 years ago
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Please help! Which Zeros are significant in the measurement .0506010 kg?
Vitek1552 [10]
It would be a,b,c as the answer. hope this helps!
7 0
3 years ago
The mass spectra of alcohols often fail to exhibit detectable M peaks but instead show relatively large ________ peaks.
nirvana33 [79]

Answer: M-18

Explanation:

The mass spectra of alcohols often fail to exhibit detectable M peaks but instead show relatively large __M-18___ peaks.

Mass spectroscopy is used to determine the molecular mass and molecular formula of a sample.

When the mass spectra of alcohols do not show detectable M peaks, they show relatively large M-18 peaks.

6 0
3 years ago
Can two different samples of the same substance have different physical properties? Chemical properties?
lina2011 [118]

yes, because they are combined in different ratios.
4 0
3 years ago
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