Explain how increasing the efficiency of cars could help contain ...

[asan beg]

Explain how increasing the efficiency of cars could help contain greenhouse warming.
 
  What will be an ideal response?

Question 2

Suppose reaction A involves the breaking of bonds and 75 J of energy, reaction B involves the breaking of bonds and 40 J of energy, and reaction C involves the making of bonds and 125 J of energy.
 
  What is the overall A + B + C reaction energy? Is this an exothermic or an endothermic reaction? Explain.

[ong527]

Answer to Question 1

More cars being more efficient would mean smaller use of fossil fuels overall,
reducing emissions of CO2 . Of course, if people just drive more ...

Answer to Question 2

In making bonds, the total energy release was 125 J. This is more than the energy
supplied to break bonds, 75 J + 40 J = 115 J. Overall in this reaction, bonds are made and
net energy is supplied by the chemical system to the outside. This is an exothermic reaction,
because energy of 10 J = 125 J - 115 J can be extracted from the system when the
reaction occurs.

[asan beg]

Excellent

[kjohnson]

Gracias!