A catalyst is a substance that alters the rate of a chemical reaction without being used up or permanently changed chemically. Enzymes are catalytic proteins that help speed up chemical reactions in the body. A catalyst works by changing the energy pathway for a chemical reaction. It provides an alternative route (mechanism) that lowers the Activation Energy, meaning more particles now have the required energy needed to undergo a successful collision.
Figure 1 shows the energy of a reaction.
Increasing the concentration of enzyme in a chemical reaction will further increase the rate of that reaction. At some point, however, equilibrium is reached and the reaction plateaus as there is only so much material for the enzyme to interact with.
Quiz Summary
0 of 5 Questions completed
Questions:
Information
You have already completed the quiz before. Hence you can not start it again.
Quiz is loading…
You must sign in or sign up to start the quiz.
You must first complete the following:
Results
Results
0 of 5 Questions answered correctly
Your time:
Time has elapsed
You have reached 0 of 0 point(s), (0)
Earned Point(s): 0 of 0, (0)
0 Essay(s) Pending (Possible Point(s): 0)
Categories
- Not categorized 0%
- 1
- 2
- 3
- 4
- 5
- Current
- Review
- Answered
- Correct
- Incorrect
-
Question 1 of 5
1. Question
Question 1:
Based on the information in the passage and the information in Figure 1, it can be inferred that the energy of the products of a reaction is:
CorrectIncorrect -
Question 2 of 5
2. Question
Question 2:
A student increases the concentration of enzyme and the rate of the reaction increases. He then further increases the concentration of enzyme, and the reaction remains the same. The most probable explanation for this is:
CorrectIncorrect -
Question 3 of 5
3. Question
Question 3:
Based on Figure 1, the activation energy required in a reaction without the help of a catalyst relates how to the activation energy in a reaction with a catalyst? The activation energy in a reaction without a catalyst is approximately:
CorrectIncorrect -
Question 4 of 5
4. Question
Question 4:
A substrate is the compound with which an enzyme interacts to catalyze a reaction. A student was measuring the effects of increasing substrate concentration on a reaction. Based on the passage, it can be inferred that increasing the substrate concentration will:
CorrectIncorrect -
Question 5 of 5
5. Question
Question 5:
Based on the figure, as a reaction proceeds, the energy in the reaction:
CorrectIncorrect