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Essential Chemistry for IGCSE - Making And Identifying Salts (Section 4)

1
Which of the following is the best way to identify whether a gas is sulfur dioxide?
Answer
(D)
Passing the gas through acidified potassium manganate(VII)
2
If you mix solutions and produce an insoluble substance, what is this process called?
Answer
(C)
Precipitation
3
What observation is made when sulfur dioxide gas is bubbled through acidified potassium manganate(VII) solution?
Answer
(A)
The solution turns from purple to colorless.
4
Which of the following could be identified using a flame test?
Answer
A
C
5
What is the key observation when testing for carbon dioxide gas?
Answer
(C)
Limewater turns milky
6
What are the two products of reacting an acid with a base?
Answer
(A)
Salt and water
7
What will you use to find the end-point of a titration?
Answer
(C)
An indicator
8
What process is used to make an insoluble salt?
Answer
(C)
Precipitation
9
Which of the following can be used in testing for the presence of gases?
Answer
A
B
D
10
In a titration, what best describes the process?
Answer
(B)
Adding one solution to another until the reaction is complete
11
What does the indicator do during the titration?
Answer
(C)
Shows the end point.
12
When hydrogen gas is produced, the gas can produce what sound?
Answer
(C)
A squeaky pop
13
Which of the following can be used to identify the presence of sulfate ions?
Answer
(A)
Barium chloride solution
14
In a titration, what is the function of the indicator?
Answer
(B)
To signal the end point of the reaction
15
What is the typical observation when hydrogen gas burns?
Answer
(B)
Burns with a squeaky pop sound.
16
When making salts, the reaction that neutralizes an acid with an alkali is also known as:
Answer
(C)
Titration
17
What is the main observation when chlorine gas is present?
Answer
(C)
It turns blue litmus paper white.
18
When testing for gas, the result that identifies chlorine is:
Answer
(D)
Indicator paper turns blue.
19
Which of these salts is *not* soluble?
Answer
(C)
Silver chloride
20
When making a salt by reacting a metal with an acid, which of the following is typically *not* a step?
Answer
(D)
Add water to the solution.
21
Which gas turns limewater milky?
Answer
(C)
Carbon Dioxide
22
Which of the following is the correct order of steps when carrying out a titration?
Answer
(B)
Fill burette -> Add indicator -> Add reactant and read the burette -> Repeat the process.
23
Which of the following best describes a 'soluble' salt?
Answer
(A)
A salt that dissolves in water.
24
What reagent is used to test for cations?
Answer
(B)
Sodium hydroxide
25
Which of the following can be made by mixing two soluble salts together?
Answer
(B)
Silver chloride
26
What steps are involved in making a soluble salt from the reaction of a metal with an acid?
Answer
B
C
27
When making salts by the titration method, what is typically used in the burette?
Answer
(A)
The acid
28
What is the role of the stirrer in the making of a salt?
Answer
(A)
To speed up the reaction.
29
What is the general name given to reactions where acids and bases react?
Answer
(B)
Neutralization
30
What is the purpose of performing a flame test?
Answer
(A)
To test for the cation in a compound
31
Which of the following is the most important step in making a salt?
Answer
(C)
React with the acid.
32
What is the function of the burette in a titration?
Answer
(C)
To add one solution to another, measuring the volume.
33
What is the name given to the point where the acid and base have completely reacted in a titration?
Answer
(A)
Equivalence point
34
Which of the following gases can be detected with an indicator?
Answer
B
D
35
How does a student ensure complete reaction when preparing copper(II) sulfate from copper(II) oxide and sulfuric acid?
Answer
(B)
Add excess copper(II) oxide, and then filter off the excess copper(II) oxide.
36
What method is best used to make the salt zinc chloride?
Answer
(A)
Reacting zinc with hydrochloric acid
37
What is the main process used to obtain a pure salt crystal after the reaction?
Answer
(B)
Evaporation
38
In a flame test, how does the color observed help in identifying a substance?
Answer
(B)
It identifies the metal ions present.
39
Which gas turns limewater milky?
Answer
(B)
Carbon dioxide
40
During a flame test, the color of the flame is a result of the what present in the compound?
Answer
(D)
The cation
41
What is the purpose of an indicator in a titration?
Answer
(C)
To show the end point of the reaction.
42
What is the general result when a metal reacts with a dilute acid?
Answer
(C)
Salt and hydrogen
43
What is the color of the flame produced by compounds containing sodium ions in a flame test?
Answer
(C)
Yellow
44
What are the characteristic observations for the presence of carbon dioxide?
Answer
B
D
45
What type of chemical reaction is used to make a salt by mixing an acid and a base?
Answer
(B)
Neutralization
46
Which of the following procedures are involved in making a salt via reacting a metal with an acid?
Answer
A
B
47
When making a salt by reacting an insoluble base with an acid, the base is added to the acid until:
Answer
(D)
Excess base remains
48
When are the reactants said to be neutralized?
Answer
(D)
At the end point of the titration.
49
Which one of these is not used to make salts?
Answer
(C)
Adding an acid to water
50
What is the method used to identify an insoluble salt?
Answer
(B)
Precipitation