WorksheetsRate of Chemical Reactions
Total questions: 15
Worksheet time: 15mins
The process by which one or more substances change to produce one or more different substances
Chemical Process
Reactant
Chemical Reaction
What does the rate of chemical reactions refer to?
The volume of reactants used
The pressure under which reactions take place
The speed at which reactants turn into products
The temperature at which reactions occur
How can the rate of a reaction be measured?
By how fast the reactants are used up or products are formed
By the sound produced during the reaction
By the temperature change in the reaction
By the color change of the reactants
What does a graph showing the mass of reactants remaining over time typically demonstrate about the rate of reaction?
It remains constant throughout the reaction
It increases as the reaction progresses
It starts off slow and then speeds up
It starts off fast and then slows down
What happens to the rate of reaction as the reactants get used up?
It speeds up
It remains the same
It slows down
It stops completely
Which of the following is NOT a correct unit for measuring the rate of reaction?
Grams per second
Centimeters cubed per second
Moles per minute
Miles per hour
What is the rate of reaction if 0.6 moles of magnesium are used in 2 minutes?
1.2 moles per minute
0.2 moles per minute
0.3 moles per minute
0.6 moles per minute
Which of the following is an example of a slow reaction?
Boiling water
Fireworks exploding
The rusting of iron
The reaction between magnesium and an acid
Which factor does NOT affect the rate of a chemical reaction?
Concentration of reactants
Temperature
Presence of a catalyst
Color of reactants
What is the effect of increasing the temperature on the rate of a chemical reaction?
Decreases the rate
Increases the rate
No effect
Stops the reaction
In a reaction between hydrochloric acid and magnesium, which observation indicates that the reaction rate is increasing?
The solution turns blue
Bubbles form more rapidly
The solution becomes colder
The magnesium dissolves slower
Which of the following graphs best represents a reaction that starts quickly and then slows down?
A straight line
A curve that levels off
A curve that slopes upwards
A horizontal line
If a catalyst is added to a reaction, what happens to the activation energy?
It increases
It decreases
It remains the same
It becomes zero
What is the rate of reaction if 0.8 moles of a substance are consumed in 4 minutes?
0.2 moles per minute
0.4 moles per minute
0.1 moles per minute
0.3 moles per minute
Which of the following is an example of a fast reaction?
Photosynthesis
Rusting of iron
Combustion of gasoline
Fermentation
