WorksheetsActivity 1
Total questions: 15
Worksheet time: 8mins
What is the effect of temperature rise on reaction rate?
It increases molecular concentration and slows reaction rate.
It increases the number of effective collisions among reactants, thus increasing the reaction rate.
It decreases the system's energy and limits how much further reaction can take place.
It decreases the number of collisions and the energy of molecules to limit the further reaction.
Crushing a solid into a powder will increase the reaction rate. Why?
The particles will collide with more energy.
The powdered form has more surface area.
The activation energy barrier will be lowered.
The orientation of colliding particles will be improved.
Why does increasing the temperature of the reactants increase the reaction rate?
Heat energy increases the size of the molecules of reactants, and therefore the molecules react more frequently.
Heat energy helps to lower the amount of overall energy that is required for the reaction to occur.
Heat energy causes some of the reactants to evaporate, thereby increasing the concentration of the reactants.
Heat energy causes the particles of the reactants to move faster, therefore, react with each other more frequently.
Which of the following will decrease the number of effective collisions during a chemical reaction?
Adding a catalyst.
Decreasing the temperature.
Increasing the surface area.
Increasing reactant concentrations.
Why are many types of foods stored in refrigerators?
At lower temperatures, the chemical reactions that spoil food occur slower than usual.
Refrigerators also contain enzymes that slow the rate of reactions that spoil the food.
The volume inside the refrigerator decreases the concentration of the food particles, allowing them to decompose more slowly.
Bacteria do not grow well in dark places.
A temperature increase causes the particles ......
to slow down
move faster
collide higher
in the right order
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
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 particle collisions
it increases the frequency of particle collisions
As the frequency of ______________ increases, the rate of reaction increases.
Time
Reactions
Collisions
Reactants
What is collision theory?
Increasing the number of collision that occur between molecules will increase the rate of the chemical reaction.
Molecules need enough energy to collide and react.
Atoms constantly collide and react.
The minimum energy needed for atoms to react
Aluminum reacts with Nitrogen to produce Aluminum nitride. What type of chemical reaction is involved?
Synthesis
decomposition
single replacement
Ionic reaction
What type of Chemical reaction is involved?
Substitution
Double replacement
Single replacement
Decomposition
