Welcome to your Grade 11 Chemistry chapter 4
After carefully reading the following 30 questions, choose the correct answer.
1.
What is defined as the change in concentration of a reactant or a product per unit time?
2.
Which of the following is NOT a factor that generally affects the rate of a chemical reaction?
3.
According to the collision theory, what must happen for a reaction to occur between two particles?
4.
What is the minimum energy required for a collision to result in a reaction called?
5.
How does increasing the surface area of a solid reactant affect the reaction rate?
6.
What is the role of a catalyst in a chemical reaction?
7.
In a rate expression, what does the order of reaction with respect to a reactant represent?
8.
Which state of matter generally reacts faster due to higher mobility and frequency of collisions?
9.
What happens to the rate of most chemical reactions when the temperature is increased?
10.
A reaction that occurs in a single step is called a/an:
11.
The series of elementary steps that make up a complex reaction is called the:
12.
Which step in a reaction mechanism determines the overall rate of the reaction?
13.
What are the units of the rate constant (k) for a first-order reaction?
14.
For a reaction A+B→Products, if the rate law is Rate=k[A]2[B], what is the overall order of the reaction?
15.
A substance that increases the rate of a reaction but is in a different phase than the reactants is a:
16.
Which of the following describes an activated complex?
17.
What is the relationship between the rate of disappearance of reactant A and the rate of appearance of product B in the reaction 2A→B?
18.
The constant 'k' in the rate law expression is known as the:
19.
For a zero-order reaction, how does the rate change if the concentration of the reactant is doubled?
20.
Which equation relates the rate constant of a reaction to the absolute temperature?
21.
A reaction intermediate is a species that:
22.
In an exothermic reaction, the energy of the products is:
23.
What does the term 'molecularity' refer to in chemistry?
24.
If a reaction is bimolecular, how many reactant particles are involved in the elementary step?
25.
Which of the following will increase the number of collisions per unit time?
26.
The half-life of a first-order reaction:
27.
Biological catalysts are known as:
28.
Photochemical reactions are initiated by:
29.
The term 'instantaneous rate' refers to:
30.
Which of the following represents the units for a second-order rate constant?
