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shutvik [7]
3 years ago
14

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

Chemistry
2 answers:
bixtya [17]3 years ago
5 0
The last option, fossil fuels are non-renewable sources.
melisa1 [442]3 years ago
3 0

Answer: Burning fossil fuels contributes to climate change.

Fossil fuels are nonrenewable.

Explanation:

The fossil fuels are the nonrenewable sources of energy where as the hydrogen fuel cells are the renewable sources of energy which uses the energy harnessed from the hydrogen ions to generate electricity.

The burning of the fossil fuels to generate thermal energy can produce huge amounts of the poisonous and polluting gases liberated into the atmosphere. But the hydrogen fuel cells does not produce any polluting gas.

Fossil fuels are non- renewable as they cannot be used again after once used. But the hydrogen fuel cells are the renewable source of energy.

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Give an example of a substance that is MORE dense in its solid state when compared to its liquid state.
Natalka [10]

Answer: Wax

Explanation:

Density is defined as the mass contained per unit volume.

Density=\frac{mass}{Volume}

Usually solids are more denser than liquid, as molecules in solid are more strongly packed and thus have more mass per unit volume.

Liquids on the other hand contain molecules which are less tightly bound and thus thus contain less mass per unit volume as compared to solid.

Example: Solid wax is more denser than liquid wax.

4 0
3 years ago
Use the ruler to determine the length of the line measured to the correct degree of precision. 13.2 cm 13.25 cm 130 cm 132 mm
lapo4ka [179]
Your answer would be 13.25cm




Hope that helps!!!
3 0
3 years ago
Read 2 more answers
There are 6 different organisms in the picture above. Organize them into 2 or more groups AND defend your groups by
anyanavicka [17]

Answer:

thay all are different from each other

5 0
3 years ago
I don't know how to do any of these.plz help.its a study guide for my chemistry exam tomorrow ✌
Vladimir [108]

6.02 x 1023 atoms weigh out 63.55 grams copper.


No. of Molecules in water = 3.5mole x (6.02 x 10^23) molecules/mole = 2.107 x 10^24 molecules of H2O

8 0
3 years ago
A molecular biologist measures the mass of cofactor a in an average yeast cell. the mass is 41.5 pg . what is the total mass in
Hitman42 [59]
The unit pg stands for pictogram. It is one-trillionth of a gram. Because of the very small mass, it is expressed in the prefix form of the base units for convenience. Now, the mass of cofactor a is 41.5 pg per cell. Since there are a total of 105 cells, the total mass would be:

Total mass = 105 cells * 41.5 pg/cell = 4,357.5 pg 
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3 years ago
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