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WorksheetsCollision Theory and Rate of Reactions
Total questions: 25
Worksheet time: 13mins
Which of the following explains on how chemical reactions occur and why reaction rates differ for different reactions?
Biomolecular Reaction
Collision Theory
Limiting Reactant
Reaction Mechanism
Which of the following is NOT a key concept of the collision theory?
particles must collide in order to react
particles must collide with sufficient energy to react
particles must move slowly when they collide, otherwise they simply “bounce off” one another
particles must collide with proper orientation
Which of the following statements best describes about collision?
All colliding particles have the same amount of energy
Only fast-moving particles collide with each other
Particles do not need to collide before they react
Reactions can happen if the colliding particles have enough energy
How does a catalyst work?
by decreasing the activation energy of a reaction
by the decreasing the pressure of a chemical reaction
by increasing the temperature of a chemical reaction
by increasing the concentration of reactants in a reaction
A catalyst increases the rate of a reaction by
increasing the concentration of the reactants
increasing the activation energy of the overall reaction
decreasing the concentration of the reactant
decreasing the activation energy of the overall reaction
If the reactant particles collide with LESS THAN the activation energy, the particles bounce back, and NO REACTION will occur.
True
False
Raising the temperature of the reaction increases the rate of the reaction by increasing the energy of the collisions between reacting particles.
True
False
Increasing the surface area of the reactant, increases the rate of the reaction.
True
False
By finding out how fast products are made and what causes reactions to slow down we can develop methods to improve production.
True
False
The rate of reaction dictates the rate of production of our daily products. In order to meet the demand and safety standards, optimization of rate of reaction is nonetheless the most important subject to control and study.
True
False
The greater the frequency of collisions, the lower the rate of reaction
True
False
What is the rate of reaction?
How much energy is needed for a reaction to occur.
The time it takes for a reaction to occur.
The energy required to break a bond.
Collision Theory
What factors effect rate of reaction?
Temperature, Concentration, Pressure and Energy
Surface Area, Concentration, Energy and Pressure
Temperature, Pressure, Concentration and Surface area
Pressure, Surface Area, Particle Size and Energy
Would the reaction rate speed up, slow down, or stays the same: A tablespoon of powdered sugar placed into HCL.
Speed up
Slow down
Stays the same
Increasing the temperature of your solution will...
Not affect the rate of reaction
Slow down the rate of reaction
Speed up the rate of reaction
Decreasing the concentration of a substance will usually...
Slow down the reaction
Have no affect on the reaction
Speed up the reaction
Which has more surface area?
Large chunks of chalk
Powdered sugar
Cube of sugar
Small chunks of sugar
If the reactant particles collide with less than the activation energy, the particles will be rebound, and no reaction will occur.
True
False
If you shrink the container size that your gas substance is in what will happen?
The reaction rate will stay the same
The reaction rate will slow down
The reaction rate will speed up
With the increase in temperature, the average kinetic energy of the molecules increases, leading to a decrease in number of collisions per unit time.
True
False
More collisions correspond to a:
Faster reaction rate
Constant reaction rate
Slower reaction rate
None of the above
Which of the following is an example of the effect of temperature on reaction rate?
Cookies bake faster at higher temperatures
Bread dough rises more quickly in a warm place than in a cool one
Low body temperatures slow down metabolism
All of these
Which of the following statements is correct about the effect of particle size or surface are on the reaction rate? (Statement A): large pieces of iron react more quickly with acids than they do with finely divided iron powder. (Statement B) If you hold a match up against a large log in an attempt to start the log burning, you will find it to be an unsuccessful effort since it will not cause enough reactions to occur in order to keep the fire going that is why it is common to break a log up into many small, thin sticks
Statement A is true, Statement B is false
Statement A is false, Statement B is true
Both statements are correct
Both statements are incorrect
A catalyst is a substance that speeds up the rate of a chemical reaction and is consumed during the course of the reaction.
True
False
Which of the following statements is correct about the effect of nature or concentration of a substance on the reaction rate? (Statement A) Two antacid tablets will neutralize a given amount of acid faster than one tablet will (Statement B) Higher concentrations of acid in rain erode marble slower than lower concentrations
Statement A is true, Statement B is false
Statement A is false, Statement B is true
Both statements are correct
Both statements are incorrect
