Question

question 1 (1 point)
what is the primary difference between hydrogen and gasoline as fuels for combustion?
a hydrogen produces more energy per gram than gasoline
b hydrogen is more stable than gasoline
c gasoline produces no co2 emissions when burned
d gasoline is more environmentally friendly than hydrogen
question 2 (1 point)
what causes the overall changes in energy in a reaction to be big or small?
a the number of bonds formed or broken.
b the strength of the bonds formed or broken.
c the temperature of the surroundings.
d both a and b.
question 3 (1 point)
match the term with its definition:
column a

1. kinetic energy
2. chemical potential energy
3. conservation of energy
4. combustion

column b
a. the principle that energy can only change form, not be created or destroyed
b. the energy stored in the bonds of molecules
c. the process of burning a substance in the presence of oxygen
d. the energy associated with an object in motion

Explanation:

Question 1:

Identify primary fuel combustion difference.
Hydrogen's combustion releases more energy per gram than gasoline, which is a key primary difference. Other options are incorrect: hydrogen is less stable than gasoline; hydrogen produces no CO₂ (not gasoline); hydrogen is more environmentally friendly.

Question 2:

Identify reaction energy change cause.
Bond strength (formed/broken) determines energy change; number of bonds alone does not, and temperature is a result, not cause.

Question 3:

Match terms to definitions.

1. Kinetic energy is motion-related energy.
2. Chemical potential energy is bond-stored energy.
3. Conservation of energy states energy is not created/destroyed.
4. Combustion is burning in oxygen.

Answer:

1. Question 1: a. Hydrogen produces more energy per gram than gasoline
2. Question 2: b. The strength of the bonds formed or broken.
3. Question 3:
4. d. The energy associated with an object in motion
5. b. The energy stored in the bonds of molecules
6. a. The principle that energy can only change form, not be created or destroyed
7. c. The process of burning a substance in the presence of oxygen