Question

question 1 (1 point)
combustion requires the presence of oxygen to occur.
true
false

question 2 (1 point)
when modeling particle interactions, what could be a limitation of using physical models?
a they are too detailed.
b physical models dont accurately reflect atomic movement.
c they always overestimate energy changes.
d atoms are actually manipulated in real life.

question 3 (1 point)
when analyzing the 2017 us co2 emissions by fuel type, which sector was responsible for the most emissions?
a industrial processes
b residential heating
c agriculture
d transportation

Explanation:

1. For Question 1: Combustion can occur with non-oxygen oxidizers (e.g., hydrogen burning in chlorine), so oxygen is not strictly required.
2. For Question 2: Physical models of particles are static or simplified, so they cannot accurately show the constant, dynamic movement of atoms.
3. For Question 3: 2017 US CO₂ emissions data shows transportation was the largest emitting sector due to vehicle fuel use.

Answer:

1. False
2. b. Physical models don't accurately reflect atomic movement.
3. d. Transportation