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Essential Chemistry for IGCSE - Making And Identifying Salts (Section 3)

1
What should you do to identify a gas in the test tube?
Answer
A
C
D
2
What indicates the endpoint in a titration using phenolphthalein?
Answer
(B)
The solution turns red.
3
Which of the following is the correct order of steps for making a salt by precipitation?
Answer
(A)
Mix solutions, filter, evaporate, crystallize
4
What is the main purpose of filtration after making a salt by precipitation?
Answer
A
C
5
In the flame test for metal ions, the color of the flame is due to...
Answer
(B)
The emission of light as electrons return to their ground state
6
Which two substances will react to form an insoluble salt?
Answer
(B)
Two soluble salts
7
What is the name of the process where two solutions are mixed, and a solid is formed?
Answer
(B)
Precipitation
8
What happens to the flame color when a metal is put in a flame test?
Answer
(A)
The flame turns a color that is unique to the metal.
9
When mixing two solutions and a precipitate forms, this indicates:
Answer
(C)
An insoluble salt is being formed.
10
What color flame is produced by a potassium salt?
Answer
(A)
Lilac
11
Which gas is produced when a metal reacts with an acid?
Answer
(B)
Hydrogen
12
In a titration experiment, the solution in the burette has a known ____.
Answer
(C)
Concentration
13
If you add a solution of silver nitrate to a solution of sodium chloride, what will happen?
Answer
(A)
A precipitate of silver chloride will form.
14
What should a student do with a test tube of gas after collecting it in the test tube to identify?
Answer
(C)
The test tube should be taken out of the water to test for the gas.
15
What is the definition of an indicator in chemistry?
Answer
(C)
A substance that changes color in response to a chemical change.
16
Which of the following indicators is used to test for ammonia gas?
Answer
(A)
Litmus paper
17
What is observed when a burning splint is placed in a test tube of oxygen?
Answer
(B)
The splint continues to burn, brighter.
18
What color does methyl orange turn in an acidic solution?
Answer
(B)
Red
19
What are the correct steps to follow during a titration?
Answer
A
B
C
D
20
Which of these methods can make soluble salts?
Answer
A
B
21
During the preparation of a salt, what process is used to remove any unreacted metal?
Answer
(B)
Filtration
22
When is the end point reached in a titration?
Answer
(C)
When the indicator changes color
23
How is an insoluble salt made?
Answer
(B)
Mixing two soluble salts together.
24
Which of the following is/are typically produced when a metal reacts with an acid?
Answer
A
B
25
Which of the following statements is TRUE about what occurs during a precipitation reaction?
Answer
(B)
A solid, insoluble compound is formed.
26
In a precipitation reaction, what happens to the ions that form the insoluble salt?
Answer
(B)
They form a solid precipitate.
27
Which of the following is the correct definition of 'end point' in a titration?
Answer
(C)
The point when the reaction is complete.
28
What is the observation when sulfur dioxide is present?
Answer
(C)
Turns acidified potassium manganate(VII) colorless.
29
What type of gas is produced when a metal reacts with a dilute acid?
Answer
(C)
Hydrogen
30
What is the result if you mix two soluble salts together?
Answer
(B)
A precipitate is formed.
31
What does the 'squeaky pop' test confirm?
Answer
(B)
Hydrogen gas
32
What is the appropriate order of the steps to carry out a successful titration?
Answer
A
B
C
D
33
What is formed when an acid reacts with a base?
Answer
(C)
Salt and water
34
What is the purpose of adding aqueous ammonia in testing for the presence of certain ions?
Answer
(B)
To cause the formation of a precipitate if the ion is present
35
What type of reaction happens when a metal and an acid combine?
Answer
(D)
Oxidation
36
In the reaction between a metal and an acid, what is the role of filtration?
Answer
(C)
To remove any excess metal.
37
What is the product of the reaction between an acid and an alkali?
Answer
(C)
Both salt and water
38
In the reaction between an acid and a metal to produce a salt, what must be removed from the reaction mixture?
Answer
(C)
The excess metal
39
What is a key observation during a chemical reaction with oxygen?
Answer
(D)
The gas relights a glowing splint.
40
During a flame test, which part of the compound is responsible for the color produced?
Answer
(C)
The cation
41
What observation would you make if carbon dioxide is passed through limewater?
Answer
(B)
The limewater turns milky
42
What will be formed in the reaction of hydrochloric acid with a metal?
Answer
(B)
A salt and hydrogen
43
What is/are the steps involved in carrying out a titration?
Answer
A
B
D
44
In the reaction of a metal with an acid to make a salt, what is produced in addition to the salt?
Answer
(C)
Hydrogen
45
Which method is used to neutralize acids and alkalis to create salts?
Answer
(C)
Titration
46
In the reaction of a metal with an acid, what should be filtered off after the reaction?
Answer
(D)
The excess metal
47
Which of the following is a property of all salts formed by titration?
Answer
(C)
They are soluble in water.
48
Which of the following represents a correctly balanced chemical equation?
Answer
(A)
Zn + H2SO4 → ZnSO4 + H2
49
Which observations suggest the presence of carbon dioxide?
Answer
B
C
50
Which of the following is/are true for a precipitation reaction?
Answer
A
B
D