1) A Car engine.............. Hope it helps, Have a nice day :)
Answer:

Explanation:
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In this case, we can consider that the given heat of combustion is indeed the heat of reaction since it corresponds to the combustion of propane, which is computed by using the heat formation of all the involved species as shown below:

Thus, since the heat of formation of gaseous carbon dioxide is -393.5 kJ/mol, water -241.8 kJ/mol and oxygen 0 kJ/mol, the heat of formation of propane is:

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Answer:
The key processes of the rock cycle are crystallization, erosion and sedimentation, and metamorphism.
Explanation:
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If CFC increases, there will be a ozone depletion ! the UV rays starts entering and leads to mutation and deaths !
the temperature of the climate increases drastically !
- Separated by an actual physical barrier
<span>- Geographic isolation can be overcome in some circumstances but the majority of the population will be isolated and therefore will diverge into different species
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