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Science
Rate Of Reaction
Quiz 2
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Q.1
________ is the measure of how much area of anobject is exposed.
Surface Area
Catalyst
Temperature
Concentration
Q.2
Grains of sugar have a greater _______ than a solid cube ofsugar of the same mass, and therefore will dissolve quicker in water.
Surface Area
Catalyst
Temperature
Concentratrion
Q.3
Which among the following is NOT TRUE about the collision theory and the rate of reaction?
higher temperature ---> faster particle movements ---> more collision
higher concentration ---> more spaces between particles ---> more collision
higher surface area ---> more particle interactions ---> more collision
Q.4
Which of the following is/are the fundamental idea(s) of collision theory?
Molecules react by colliding together
The effective collisions must occur with certain minimum amounts of energy
In a large sample, the greater the number of effective collisions, and the faster the rate of reaction
All of the above
Q.5
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
Q.6
Which of the following will lower the rateof reaction?
adding an enzyme to the reaction
decreasing the temperature from 40°C to10°C
breaking a chunk of calcium up intosmaller pieces
increasing the amount of solutedissolved in a solution
Q.7
In an endothermic reaction, heat is ...
taken in
given out
Q.8
Which process has the highest rate of reaction?
Rusting
Respiration
Combustion
Photosynthesis
Q.9
What is the meaning of the rate of reaction?
Decrease in amount of product
Decrease in amount of product against time
Increase in amount of products against time
Increase in amount of reactants against time
Q.10
Products will form faster if____________
the particle size of the reactants are larger.
temperature is decreased.
concentration of the reactants are increased.
the reaction is not stirred.
Q.11
The rate of a chemical reaction is NOT affected by which of the following:
temperature
concentration
particle size (surface area)
All of these affect reaction rates
Q.12
The rate of a reaction is how _____________ a reaction occurs.
Quickly
Easily
Unusually
Differently
Q.13
Substance that changes the rate of a chemical reaction without being consumed in the reaction
bonding
catalyst
chemical reaction
activation energy
Q.14
Adding a catalyst ___________ the activation energy.
Raises
Lowers
Doesn't affect
Inreases
Q.15
As the frequency of ______________ increases, the rate of reaction increases.
Time
Reactions
Collisions
Reactants
Q.16
Increasing the temperature gives particles more __________.
Time
Energy
Space
Frequency
Q.17
Grinding a effervescent tablet into powder increases the rate of reaction due to increased
concentration
surface area
temperature
reactants
Q.18
Why does a higher temperature increase the rate of a reaction?
it increases both the frequency and energy of particle collisions
it only increases the frequency of particle collisions
it only increases the energy of particle collisions
it reduces the activation energy of the reaction
Q.19
A temperature increase causes the particles to ......
to slow down
move faster
collide higher
in the right order
Q.20
Increase in temperature causes the particles to
slow down
move faster
stay apart from each other
move in the correct order
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