Chapter 18 – Reaction Rates and Equilibrium
Jan 04, 2016
Chapter 18 – Reaction Rates and Equilibrium
100 100
200 200
400 400
300
400
Rates of Reactions
Equilibrium Entropy and Free Energy
Le Chatelier’s Principle
300 300 300
200
400
200
100
500 500 500 500
100
Row 1, Col 1
The rate of a chemical reactionmay be increased by increasing the _______ and / or ________.
Temperature or concentration of reactants
1,2
When a reaction reaches equilibrium, what can you say about the rate of the forward reaction and reverse
reaction?
They are equal.
1,3
What is the name and the symbol of the term used to describe the
‘disorder’ of a process?
Entropy (S)
1,4
Decreasing the temperature of thefollowing reaction at equilibrium
will cause it to shift in whichdirection?
N2(g) + 3H2(g) + Energy 2NH3(g)
Left Shift
2,1
As the particle size of a reactantdecreases, the rate of reaction
will __________.
Increase
2,2
What can you conclude about a chemical reaction that has reached equilibrium were the equilibrium
constant (Keq) is less than one?
Reactants are favored at equilibrium.
2,3
Is there an increase or decrease inThe entropy in the following process?
CaCO3(s) CaO(s) + CO2(g)
Increase
2,4
What will happen to the position of the equilibrium when the the pressure is raised
on the following chemical reaction?PCl5(g) PCl3(g) + Cl2(g)
It will shift to the left.
3,1
How does a catalyst speed up a chemical reaction?
It lowers the activation energy.
3,2
Write the equilibrium expression for the following chemical reaction; 4H2(g) + CS2(g) CH4(g) + 2H2S(g)
Keq = [CH4] [H2S]2
[H2]4 [CS2]
3,3
Which two factors together determineif a reaction is spontaneous or not?
Entropy (S) and Enthalpy (H)
3,4
What effect will the addition of KClO4 have on the following
Equilibrium?KClO4(s) KCl(s) + 2O2(g)
No effect, Keq = [O2]2
4,1
What is the unit usually used to expressthe rate of a chemical reaction?
Molarity / time
4,2
Write the solubility product expression,Ksp, for the dissolution of
lead (IV) carbonate.
Ksp = [Pb+4] [CO3-2]2
4,3
If the entropy and enthalpy of a chemical reaction both decrease,
what can you conclude about the spontaneity of the reaction?
It may or may not be spontaneous.
4,4
Reducing the temperature on the followingreaction will cause it to shift in which
direction?N2(g) + 3H2(g) + Energy 2NH3(g)
left
5,1
Write the rate law for the followingchemical reaction;
N2(g) + 3H2(g) 2NH3(g)
Rate = k [N2] [H2]3
5,2
What will the addition of NaCl doTo a saturated solution of PbCl2?
The addition of Cl- would cause PbCl2 to precipitate.
5,3
The following chemical reaction (will / will not) be spontaneous.
C3H8(g) + 5O2(g) 3CO2(g) + 4H2O(g) + Energy
will
5,4
What effect would adding water tothe following reaction have on its
equilibrium position?Na(s) + 2H2O(l) 2NaOH(aq) + H2(g)
No effect
Final Jeopardy • What is the concentration of carbonate
ions in a saturated solution of SrCO3?
Ksp = 9.3 x 10-10