NEW
Font size
WorksheetsUnit 7.7 / 7.8 - Calculating Eq conc and representing equilibria
Total questions: 12
Worksheet time: 9mins
A dynamic equilibrium is where...
rate of forward = rate of reverse
rate of forward > rate of reverse
concentrations of reactants and products are equal
rate of forward < rate of reverse
If K > 1 then...
reactants favoured
products favoured
equilibrium achieved
endothermic reaction
What are the 3 rows in an ICE box for finding equilibria concentrations or pressure?
Initial, Change, equal
Initial, Continuous, equilibrium
Initial, Change, Equilibrium
Internal, Change, External
A3 (g) + B3 (g) -- > 3AB(g)
If we initially have 2.5 atm of A3 and B3. Using an ICE box, what would be the initial concentration of AB
2.5 atm
5 atm
7.5 atm
0 atm
What letter do we use in ICE boxed to represent change? What would the sign be for reactants?
x and +
x and -
y and +
y and -
A3 (g) + B3 (g) --> 3AB(g)
What would be the change for the product above if inputting data into an ICE box?
x - 3
3x
x + 3
y
Pure substances....
contain only pure elements
always contain Hydrogen
contain molecules or units of a single type
contain molecules or units of two or more types
Q + 2Y --> Z
Is a reversible chemical reaction that has reacted equilibrium.
If we have 4 Q atoms, 1Y atoms and 8Z atoms in a reaction vessel. What is K?
K = 1
K = 2
K = 3
K = 4
Imagine a reaction... with A and B forming C
Below are the timings and amount of atoms at each timing.
10 mins A = 2 B = 2 C=1
20 mins A=4 B=3 C=2
30 mins A=3 B=4 C=2
40 mins A =4 B=6 C=3
50 mins A=4 B=6 C=3
What time did the reaction hit equilibrium?
30 mins
40 mins
50 mins
never hit equilibrium
Q2 + Z2 --> 2QZ
Reversible reaction, what is the expression for K...
[QZ]^2 / [Q2][Z2]
[QZ2] / [Q2][Z2]
[QZ2] / [Q]^2 [Z]^2
You do not have enough information
How many O2 molecules do we have in this reaction vessel. There are blue.
1
2
3
4
What is Molarity?
Moles per cm3
Moles per Litre
Moles per gram
Moles per Kg
