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catalyst
C 6 H 6 + Br 2 → C 6 H 5 Br + HBr
5 Which of the following changes will cause an increase in the rate of the above reaction?
A increasing the concentration of Br 2
B decreasing the concentration of C 6 H 6
C increasing the concentration of HBr
D decreasing the temperature
Chemical Concepts:
The chemical concept tied in with this question is “concentration” and how it increases the reaction
rate of a reaction. Concentration is recognized as the amount of different units, in this case, particles,
molecules, or atoms, in relation the specific space or volume which is being analyzed. The greater the
amount of particles in a fixed volume, the more likely they’re are to collide with other "reactant”
particles and in turn, the more likely they are to form new products, which ultimately increases the
reaction rate of the reaction.
2CO + O 2 → 2CO 2
6 If the above reaction takes place inside a sealed reaction chamber, then which of these procedures
will cause a decrease in the rate of reaction?
A raising the temperature of the reaction chamber
B increasing the volume inside the reaction chamber
C removing the CO 2 as it is formed
D adding more CO to the reaction chamber
Chemical Concepts:
The chemical concepts related to this question are “volume” and “laws of gases” and how they are
related to rate of reaction. Volume in science is defined by the amount of space a substance takes
up, or occupies, which when it involves gases, has a relationship with reaction rate. Gases don’t have
a definite shape and are recognized as the types of matter which contain the most active particles,
this means that they are constantly trying to escape their container and expand. If the volume inside a
container were to increase, this means that the gas inside would spread apart even more, and it
would have more space to move around freely, consequently decreasing the chances of colliding and
in turn, decreasing the reaction rate.
7 A catalyst can speed up the rate of a given chemical reaction by