Which expression represents a reaction rate?
energy/time
At what stage of a reaction do atoms have the highest energy?
reactant stage
Activation energy is
the energy given off when reactants collide
Why does a higher temperature cause a reaction to go faster?
There are more collisions per second only
Why does a higher concentration make a reaction faster?
Collisions occur with greater energy only
Why does a catalyst cause a reaction to proceed faster?
There are more collisions per second and the collisions are of greater energy.
What happens to a catalyst in a reaction?
It is unchanged
The rate of a chemical reaction normally
increases as reactant concentration increases
At equilibrium, what is the rate of production of reactants compared with the rate of production of products?
the same
If a reaction is reversible, what are the relative amounts of reactant and product at the end of the reaction?
no reactant; all product
If sulfur dioxide and oxygen can be made into sulfur trioxide, what is the reverse reaction?
2SO^2 + O^2 -> 2SO^3
Consider the reaction N^2(g) + 3H^2(g) -- 2NH^3(g). What is the effect of decreasing the volume on the contained gases?
The system reacts by increasing the number of gas molecules.
What happens to a reaction at equilibrium when more reactant is added to the system?
The reaction makes more products.
In an endothermic reaction at equilibrium, what is the effect of raising the temperature?
The reaction makes more products.
In a reaction (at equilibrium) that makes more moles of gas than it consumes, what is the effect of increasing the pressure?
The reaction makes more products
Which of the changes listed below would shift the following reaction to the right? 4HCI(g) + O^2(g) --- 2CI^2(g) + 2H^2O(g)
decrease of pressure
What is the effect of adding more water to the following equilibrium reaction? CO^2 + H^2O ----- H^2CO^3
More H^2CO^3 is produced
H^2 + CI^2 --> 2HCI Which of these describe the rate of this chemical reactions?
an increase in the concentration of HCI and H^2 with time
A catalyst can speed up the rate of a given chemical reaction by
lowering the activation energy required for the reaction to occur