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Cerrena [4.2K]
3 years ago
14

Science 7 Grade 7. Can anyone please help me answer these science questions?

Chemistry
2 answers:
masha68 [24]3 years ago
6 0
A cellphone battery is a electrical energy 
and a piston in an engine is an thermal energy
NARA [144]3 years ago
4 0
<span>Thermal expansion in a balloon occurs because when the balloon is heated up, the gas molecules will move faster and in greater distance so when if they move faster then they will hit the wall with greater force, will result to expansion.

conduction, convection and radiation are the ways that thermal energy is transferred.

a cellphone battery is an electrical energy, then piston in an engine is mechanical energy </span>
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2 years ago
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zloy xaker [14]

Answer:

D. Its temperature will remain 100 C until all the vapours condenses

Explanation:

Heat absorbed by a substance to change the state of matter is known as latent heat. This heat is utilized to break the bonds between atoms of the substance so that they can undergo phase change.

So, when water boils at 100 degree Celsius then temperature will remain constant unless and until all the water changes into vapor. As it is the latent heat that breaks the bonds between hydrogen and oxygen atoms of water so that liquid state can change into gaseous state.

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