SABIS Grade 11 Term 1 Week 7 Lesson 13
Presentation
•
Chemistry
•
11th Grade
•
Hard
Hisham Mahmoud
Used 5+ times
FREE Resource
2 Slides • 38 Questions
1
Multiple Choice
Le Chatelier's Principle states that if an equilibrium system is subjected to a change processes will
occur to
fully counteract the imposed change.
partially counteract the imposed change.
go with the imposed change.
2
Multiple Choice
SO2(g) + O2(g) <−> SO3(g)
If the concentration of SO2(g) is increased, the equilibrium of the reaction will ___________.
3
Multiple Choice
energy + N2(g) + O2(g) <−> 2NO(g)
If O2(g) is removed, the concentration of N2 will _______.
4
Multiple Choice
A(g) + B(aq) <> C(s)
ΔH= -453 kJ/mol
If the [B] is decreased then the reaction is will shift to the _______.
Left
Right
Stays the same
Up
5
Multiple Choice
Which is NOT a way to stress a closed chemical system at equilibrium?
change temperature
add a reactant
take away a chemical in the reaction
add a catalyst
6
Multiple Choice
Increasing the pressure on an equilibrium system will
shift the reaction to the side with more moles of chemicals
shift the reaction to the side with more moles of gas
shift the reaction to the side with fewer moles of gas
shift the reaction to the side with fewer moles of chemicals
7
Multiple Choice
Increasing the temperature of a closed equilibrium system
will shift the reaction in the endothermic direction
will shift the reaction in the exothermic direction
will not shift the reaction
will shift the reaction to the side with heat
8
Multiple Choice
For the following equilibrium reaction:
N2 (g) + 3 H2 (g) <==> 2 NH3 (g) ΔH=-386 kJ/mol
Predict the direction that the reaction will proceed, or shift, if...
The volume of the container is decreased.
right
left
no effect
9
Multiple Choice
H2O⇌H++OH-
This reaction is
Exothermic
Enodthermic
10
H2O⇌[H+][OH-]
This reaction is endothermic
means forward is endothermic
Forward temperature Decrease
11
Multiple Choice
H2O⇌H++OH-
This reaction is endothermic
If the system is heated (temperature increases) the system will try to
decrease the temperature so it moves in
Forward direction
Backward direction
12
Multiple Choice
H2O⇌H++OH-
This reaction is endothermic
If the system is heated (temperature increases) the system will try to decrease the temperature so it moves in
Forward direction this causes products concentration to
increase
decrease
13
Multiple Choice
H2O⇌H++OH-
This reaction is endothermic
If the system is heated (temperature increases) the system will try to decrease the temperature so it moves in
Forward direction this causes products concentration to increase
causing
kw=[H+][OH-] to
increase
decrease
14
Dissociation of water is endothermic:
H2O ⇌ H++OH-
As temperature increases, the concentrations of ions increases so Kw increases
K-chemistry.com
kw=[H+][OH-]
15
Multiple Choice
In aqueous solutions
Kw = [H+][OH–]
at all times
Sometimes
in acidic solutions
in basic solutions
16
Multiple Select
An electrolyte is a substance
that contains metal.
that produces electricity.
whose aqueous solution conducts an electric current.
which dissolves in water to give positive and negative ions.
that is made up of ions in the pure state.
17
Multiple Select
A strong electrolyte is a substance
that contains metal.
which dissolves in water and exclusively gives positive and negative ions.
which dissolves in water to give positive and negative ions.
that is made up of ions in the pure state
whose particles in water dissociate only partially into ions.
18
Multiple Select
A Weak electrolyte is a substance
that contains metal.
which dissolves in water and exclusively gives positive and negative ions.
which dissolves in water to give positive and negative ions.
that is made up of ions in the pure state
whose particles in water dissociate only partially into ions.
19
Multiple Select
equilibrium will be reached more rapidly but Kw remains constant
Kw would decrease with increasing temperature.
With increasing temperature the equilibrium will shift to the right, increasing the
concentrations of [H+] and [OH–], so increasing the value of Kw.
With increasing temperature the equilibrium will shift to the left, decreasing the concentrations of
[H+] and [OH–], so decreasing the value of Kw.
20
Multiple Select
Which ions are present in all aqueous solutions?
H+
OH–
NO3
Na+
Fe+2
21
Multiple Select
An electrolyte is a substance
that contains metal.
that produces electricity.
whose aqueous solution conducts an electric current.
which dissolves in water to give positive and negative ions.
that is made up of ions in the pure state.
22
Multiple Choice
H2O⇌H++OH-
This reaction is
Exothermic
Enodthermic
23
Multiple Select
Which of the following is true about water at 25 degrees C if either
H+(aq) or OH–(aq)
are added to it?
[OH–] = [H+] =
1.00× 10–7 M
[OH–] ≠ [H+] ≠
1.00× 10–7 M
[OH–] ×[H+] =
1.00 × 10–14 M
24
Multiple Select
Which of the following is true about an aqueous solution where
[H+] = 1.00 × 10–10 M?
[OH–] = [H+]
= 1.00 × 10–7 M.
[OH–] = [H+]
= 1.00 × 10–10 M
[OH–] = [H+]
= 1.00 × 10–14 M
[H+] =
1.00 × 10–4 M
[OH–] =
1.00 × 10–4 M
25
Multiple Select
An operational definition is
a definition of an operation.
a definition based on set of actions that can be performed in the lab.
a definition based on a theoretical concept.
a definition based on a single property.
a definition that satisfies a number of mathematical conditions.
26
Multiple Select
Which of the following is an example of (or contains) an acid?
Vinegar.
Ammonia solution.
Yoghurt.
Na2CO3.
NaOH.
27
Multiple Select
Which of the following is (or is a part of) the operational definition of an acid?
It contains oxygen.
Its aqueous solution conducts an electric current.
If its aqueous solution is added to zinc metal, hydrogen gas is liberated.
If blue litmus paper is dipped in its aqueous solution, it turns to red.
It contains hydrogen.
28
Multiple Select
Which of the following is a property of HCl (aq) solutions?
It contains oxygen.
Its aqueous solution conducts an electric current.
If its aqueous solution is added to zinc metal, hydrogen gas is liberated.
If blue litmus paper is dipped in its aqueous solution, it turns to red.
It contains hydrogen.
29
Multiple Select
A conceptual definition is
a definition of a concept.
a definition that satisfies a number of mathematical conditions.
a definition based on set of actions that can be performed in the lab.
a definition based on a theoretical concept.
a definition based on a single property.
30
Multiple Choice
Which of the following is a titration ?
A state of equilibrium for acid-base systems.
Mixing acid and base solutions containing the same number of moles.
The progressive addition of a base to an acid or vice versa.
The addition of a fixed volume of base to an acid with an indicator.
The addition of a fixed volume of acid to a base with an indicator.
31
Multiple Select
Which of the following is (or is a part of) the conceptual definition of an acid?
It contains hydrogen.
It can increase the [OH–(aq)] in aqueous solution.
Its aqueous solution conducts an electric current.
If its aqueous solution is added to zinc metal, hydrogen gas is liberated.
It can increase the [H+(aq)] in aqueous solution.
32
Multiple Select
Which of the following is an example of (or contains) a base?
Vinegar.
Ammonia solution.
Yoghurt.
NaOH.
H2SO4
33
Multiple Select
Which of the following is (or is a part of) the operational definition of a base?
If its aqueous solution is added to zinc metal, hydrogen gas is liberated.
If blue litmus paper is dipped in its aqueous solution, it turns to red.
If red litmus paper is dipped in its aqueous solution, it turns to blue.
It tastes sour and bitter at the same time.
It feels slippery, like soap.
34
Multiple Select
Which of the following is (or is a part of) the conceptual definition of a base?
It contains hydrogen.
It contains oxygen.
It can increase the [OH–(aq)] in aqueous solution.
d) Its aqueous solution conducts an electric current.
It can decrease the [H+(aq)] in aqueous solution.
35
Multiple Select
An acid-base indicator is
an instrument to mix exactly equal amounts of acid and base solutions containing the same number of moles.
a dye whose colour is sensitive to the change of [H+].
a meter to measure the amount of acid and base added.
a colormeter used for the addition of a fixed volume of acid to a base.
an instrument to determine the state of equilibrium for acid-base systems.
36
Multiple Select
Litmus, a dye, is
blue in an acidic solution and red in a basic solution.
orange in an acidic solution and red in a basic solution.
red in an acidic solution and blue in a basic solution.
pink in an acidic solution and colourless in a basic solution.
colourless in an acidic solution and pink in a basic solution.
37
Multiple Select
Phenolphthalein is coloured
blue in acid and red in base.
red in acid and blue in base.
colourless in acid and pink in base.
pink in acid and colourless in base.
red in acid and yellow in base.
38
Multiple Select
In titrations using phenolphthalein, what is the solution placed in the burette?
The acid.
The base.
Either the base or the acid may be used.
Phenolphthalein.
A mixture of the two solutions.
39
Multiple Select
In titrations, the volume of base used is determined by
Taking the last reading of the burette.
Taking the first reading of the burette.
Taking the difference between the last and first reading of the pipette.
Taking the first reading of the pipette.
Taking the difference between the last and first reading of the burette.
40
Multiple Select
You realize that the end-point of an acid-base titration with phenolphthalein has been reached when
the addition of a single drop turns the liquid in the flask pink.
all the base finishes.
the addition of a single drop turns the liquid in the burette pink.
the addition of a single drop turns the liquid in the flask colourless.
you see the solution become neutral.
Le Chatelier's Principle states that if an equilibrium system is subjected to a change processes will
occur to
fully counteract the imposed change.
partially counteract the imposed change.
go with the imposed change.
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