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Worksheetsอัตราการเกิดปฏิกิริยา
Total questions: 20
Worksheet time: 23mins
Which of the following increase the reaction rate?
less surface area
lower temperature
increasing pressure
low concentration
Which of the following are the factors that affecting the rate of reactions?
Size of reactants
Concentration of reactants
Temperature
Presence of catalyst
All of above
Which factor can only affects the rate of reaction when involved gases as the reactant?
Concentration of reactants
Pressure
Temperature
Size of reactants
Which of the following statement is correct?
Smaller size of reactants, smaller total surface area, higher reaction rate
Larger size of reactants, smaller total surface area, higher reaction rate
Smaller size of reactants, larger total surface area, higher reaction rate
Larger size of reactants, larger total surface area, higher reaction rate
_____________ concentration of reactants by adding solute; ______________ concentration of reactants by adding solvent.
Increase; Increase
Decrease; Decrease
Increase; Decrease
Decrease; Increase
Does the presence of catalyst will change the amount of product?
Yes
No
If the temperature is reduced, a reaction rate will ______
increase
decrease
stay the same
How does temperature increase the rate of a chemical reaction?
Provides lower energy route for the reaction so that a greater number of particles have enough energy to react.
Increased number of collisions increases the chance of a 'successful collision'
Particles collide faster and harder so a larger proportion have greater energy than the required activation energy.
Greater number of 'active sites' available for a reaction to take place (referring to solids)
How does concentration increase the rate of a chemical reaction?
Provides lower energy route for the reaction so that a greater number of particles have enough energy to react.
Increased number of collisions increases the chance of a 'successful collision'
Particles collide faster and harder so a lagrer proportion have greater energy than the required activation energy.
Greater number of 'active sites' available for a reaction to take place (referring to solids)
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
