Font size
WorksheetsPractice Test (Midterm)
Total questions: 15
Worksheet time: 23mins
Which of the following factors can affect the value of the activation energy of a reaction?
1. the presence of a catalyst
2. changes in temperature
3. changes in the concentration of the reactants
1 only
1 and 2 only
3 only
1,2, and 3
When the pressure of a fixed mass of gaseous reactants is raised at a constant temperature, the rate of reaction increases.
Which of the following statements explain this observation?
(You can choose more than 1 answer)
rasing the pressure lowers the activation energy
more molecules have energy greater than the activation energy at the higher pressure
More collisions occur per second when the pressure is increased
What is the main reason for the increase in reaction rate with increasing temperature?
The activation energy decreases
The activation energy increases
The molecules collide more frequently
More molecules have an energy greater than the activation energy
What two trials would you use to find the order for B?
trials 1 and 2
trials 1 and 3
trails 2 and 3
The reaction A + 2B → products was found to have the rate law, k = k[A][B]2. Predict by what factor the rate of reaction will increase when the concentration of B is doubled and the concentration of A remained uncanged
2
4
6
8
2 NO(g) + O2(g) ⇌ 2 NO2(g)
An acid has a pH
higher than 7
lower than 7
7
greater than 14
What might happen if buffers did not exist within the human body?
Our blood and other bodily fluids might become too acidic or basic.
Our stomach acid would not be able to break down food.
We would not be able to process glucose within our cells.
We would not be able to inhale oxygen into our lungs.
