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WorksheetsRate of Reaction
Total questions: 50
Worksheet time: 47mins
Preservatives are used to slow the spoilage of food, so they are referred to as __________.
Catalyst
Inhibitor
Endothermic
Exothermic
Enzymes in your body act as catalysts. Thus, the role of enzymes is to___________.
inhibit chemical reactions.
increase the rate of chemical reactions.
decrease the rate of chemical reactions.
________ the concentration ______ the reaction rate.
increasing; decreases
increasing; increases
decreasing; increases
decreasing; does not effect
Which of the following would react fastest in sweet tea?
a sugar cube
a sugar cube cut in half
a sugar cube cut in fourths
a sugar cube crushed into powder
Which phrase describes what happens to atoms in a chemical reaction?
never lost or gained, just rearranged
sometimes lost, never rearranged
sometimes lost, gained, or rearranged
lost or gained, never rearranged
Which of the following chemical reactions illustrates a decomposition reaction?
4H2 + 2O2 --> 2H2O
2H2O --> 2H2 + O2
6CO2 + 6H2O --> C6H12O6 + 6O2
4KI + 2Cl2 --> 4KCl + 2I2
This equation is an example of which type of chemical reaction? Zn + 2HCl--> ZnCl2 + H2
synthesis
decomposition
single replacement
double replacement
A chemical reaction in which energy is absorbed is ______________.
an endothermic reaction
an exothermic reaction
a single replacement reaction
a double replacement reaction
The equation is an example of which type of chemical reaction? NaCl + AgF -->NaF + AgCl
synthesis
decomposition
single replacement
double replacement
A substance that slows down or stops a chemical reaction is called a(n)______________.
concentrate
catalyst
inhibitor
product
Four light sticks are placed in water baths of varying temperatures. At which temperature would the light stick glow the brightest?
0° C
20° C
30° C
40° C
List four factors that affects the rate of a reaction
temperature
concentration
surface area
volume
catalysts
Which of these are the activation energy?
A
B
C
D
Why does increasing temperature increase the rate of reaction? Tick all correct options.
There is a lower activation energy
The particles have higher energy
There are more frequent collisions
The particles have a higher surface area
How does surface area affect the rate of reaction?
Increasing surface area increases the rate
Increasing concentration decreases the rate
Why does increasing surface area increase the rate of reaction? Tick all correct options.
There is a lower activation energy
There are more particles in the same volume
There are more frequent collisions
The particles have a higher surface area
Why don't all collisions between particles cause a reaction?
the particles also need to collide with a catalyst
not all the particles collide with enough energy
not all the particles collide at a high enough temperature
the particles need to collide with each other twice
Substance that changes the rate of a chemical reaction without being consumed in the reaction
bonding
catalyst
chemical reaction
activation energy
The minimum amount of energy needed for colliding particles to react is called
Chemical Energy
Kinetic Energy
Activation Energy
Potential Energy
What criteria must be met for reactant collisions to result in a successful product?
The reactants must collide with each other
The reactants must collide with enough energy and be in the right positions
The reactants must have enough energy to form the activated complex
Which of the following will lower the rate
of reaction?
adding an enzyme to the reaction
decreasing the temperature from 40°C to
10°C
breaking a chunk of calcium up into
smaller pieces
increasing the amount of solute
dissolved in a solution
Grinding a effervescent tablet into powder increases the rate of reaction due to increased
concentration
surface area
temperature
reactants
what factors can affect the value of the activation energy of a reaction?
The presence of a catalyst
changes in temperature
changes in concentration of the reactants
changes in pressure
The ______________is required to break the bonds of the reactants.
Carbonic energy
Activation energy
Plutonic energy
Energi Gaib
How does a catalyst work in speeding up a reaction?
By lowering the activation energy or reaction
by giving them more energy
by making them more available
Which of the following is the meaning of activation energy?
The maximum energy that the particles need to produce effective collision
The amount of energy used by the particles during a collision
The minimum amount of energy that particles must have in order to react
The amount of kinetic energy of molecules during a collision
Which of the following explains the meaning of effective collision?
The collision where its energy is less than the activation energy
The collision that has a low energy
The collision which takes place before a reaction
The collision that causes a reaction
Increase in temperature causes the particles to
slow down
move faster
stay apart from each other
move in the correct order
Which factors affect the rate of a reaction?
temperature
concentration
size
pressure
catalyst
How can you increase the rate of a reaction?
Decrease the pressure
Increase the concentration
Decrease the concentration
Identify where the reaction has finished
A
B
C
D
The more collisions between particles of reactants there are in a given time ...
the faster reaction
the slower reaction
Look at the graph. At what time does the reaction finish?
4 minutes
6 minutes
5 minutes
7 minutes
How can rate of reaction be measured in reactions?
Measure mass lost when gas produced.
Measure color change or formation of a solid.
Measure volume of gas produced.
Measure time taken for liquid to disappear.
How is this equipment being used to measure the rate of reaction?
The gas syringe measures how much gas is produced in a certain time
The reaction mixture will increase in volume in a certain time
What is the rate of reaction?
How fast a reaction is
How loud a reaction is
How big a reaction is
Why does a higher temperature increase the rate of a reaction?
It increases both the frequency collision and energy of reactant particles
It only increases the frequency of collision
It only increases the energy of reactant particles
It reduces the activation energy of the reaction
Why does a higher concentration increase the rate of reaction?
it increases the amount of reactants
it lowers the activation energy
it increases the energy of reactant particles
it increases the frequency of collision
Increase in temperature causes the particles to
slow down
move faster
stay apart from each other
move in the correct order
Which of the following is the meaning of activation energy?
The maximum energy that the particles need to produce effective collision
The amount of energy used by the particles during a collision
The minimum amount of energy that particles must have in order to react
The amount of kinetic energy of molecules during a collision
