Question

question 17 (1 point)
why might hydrogen produce more energy per gram than gasoline when burned?

a hydrogen burns at a lower temperature than gasoline
b hydrogen atoms are larger and release more energy
c the combustion process of hydrogen releases a greater amount of heat
d gasoline contains impurities that reduce energy output

question 18 (1 point)
what pattern do you see in the data regarding energy and co2 emissions per fuel type?

a all fuels produce the same amount of co2 emissions
b renewable fuels tend to produce less co2 than fossil fuels
c energy production does not impact co2 emissions
d fossil fuels produce more energy with no co2 emissions

Explanation:

For Question 17: Option a is incorrect because combustion temperature does not determine energy per gram. Option b is wrong because hydrogen atoms are smaller, not larger. Option d is incorrect as gasoline's impurities are not the main reason hydrogen has higher energy per gram; the key is the heat released during hydrogen's combustion reaction.
For Question 18: Option a is false since different fuels have different CO2 outputs. Option c is wrong because energy production from most fuels directly impacts CO2 emissions. Option d is incorrect because fossil fuels do produce CO2 emissions when used for energy.

Answer:

Question 17: c. The combustion process of hydrogen releases a greater amount of heat
Question 18: b. Renewable fuels tend to produce less CO2 than fossil fuels