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Essential Chemistry for IGCSE - Making And Identifying Salts (Section 5)

1
When performing a flame test, what does the color of the flame indicate?
Answer
(B)
The presence of metal ions (cations).
2
What should be removed in the experiment of making the salt when an acid is reacted with a metal?
Answer
(B)
The remaining reactants
3
What type of solution will react to form a precipitate?
Answer
(D)
A solution of two soluble compounds
4
What is the correct way to prepare a soluble salt via a titration?
Answer
(B)
Slowly add the base to the acid using an indicator to signal when the solution is neutral.
5
In a flame test, what do the different colors represent?
Answer
(B)
The presence of certain metal ions.
6
Which gas is produced when a metal reacts with an acid?
Answer
(B)
Hydrogen
7
If you have two reactants, how do you identify the metal ion?
Answer
(B)
Do a flame test
8
When making salts, what is the best way to obtain a pure, dry salt?
Answer
(A)
Filtration, then evaporation.
9
When performing a flame test, what is the main reason for cleaning the wire loop before use?
Answer
(B)
To remove any previously present compounds.
10
Which of the following is the correct formula for copper(II) sulfate?
Answer
(B)
CuSO4
11
Which of the following statements is correct about a reaction of a base and an acid?
Answer
(B)
The reaction will always create a neutral solution
12
Which steps are involved in making a soluble salt?
Answer
A
C
D
13
Which of the following is a correct way to make a salt?
Answer
(B)
Reacting a metal with an acid.
14
What type of chemical reaction is used to make an insoluble salt?
Answer
(B)
Precipitation
15
What does a solution contain at the end point of a titration?
Answer
(C)
Salt and water.
16
What is the term for the point in a titration when the reaction is complete?
Answer
(A)
Equivalence point
17
What is a key difference in an acid-base titration versus making a salt from metal?
Answer
(C)
Titration uses an indicator to find the end point.
18
When is a precipitate formed?
Answer
(A)
When two soluble substances are mixed.
19
Which of the following would produce a yellow precipitate when reacted with a solution containing the lead(II) ion?
Answer
(B)
Potassium iodide
20
What is the most efficient way to prepare copper sulfate?
Answer
(A)
Mixing copper(II) oxide with sulfuric acid.
21
Which compound forms a white precipitate when added to a solution containing the zinc ion?
Answer
(B)
Aqueous ammonia
22
In a flame test, the color of the flame indicates the presence of what in a compound?
Answer
(C)
The cation
23
When making a salt, which of these mixtures is not part of the process?
Answer
(D)
A base and an indicator
24
What process is used to separate an insoluble salt from a solution?
Answer
(C)
Filtration
25
What is used to absorb a gas that will damage the environment?
Answer
(A)
Alkali
26
After reacting a metal with an acid, which step must be performed?
Answer
(B)
Filter the solution.
27
What is a main observation when sulfur dioxide gas is present?
Answer
(C)
Turns acidified potassium manganate(VII) solution colorless
28
In a flame test, what component of a sample is responsible for the color observed?
Answer
(D)
The cation
29
How can you tell if hydrogen gas is present in a test tube?
Answer
(C)
It makes a "pop" sound when a lit splint is placed at the mouth of the tube.
30
When testing for hydrogen gas, which result indicates the presence of hydrogen?
Answer
(A)
A squeaky pop sound
31
Which of the following is/are used to test for gas?
Answer
A
B
C
D
32
What is the color of the precipitate formed when aqueous ammonia is added to a solution containing copper(II) ions?
Answer
(A)
Blue
33
How does a student know that they have reached the end point in a titration?
Answer
(C)
The indicator changes color.
34
What method/s is/are used to create a dry salt?
Answer
C
A
35
What are the essential components needed to make a salt by reacting an acid with a metal?
Answer
(A)
The acid and the metal
36
If you react zinc with hydrochloric acid, what is the salt formed?
Answer
(B)
Zinc chloride
37
In the process of making a salt by reacting an acid with a metal, what is the role of filtration?
Answer
(B)
To remove excess metal that has not reacted.
38
What method is used to prepare a pure, dry sample of a salt?
Answer
(B)
Filtration then evaporation
39
In the experiment to make salts by the reaction of a metal with an acid, what should be removed from the reaction mixture?
Answer
(C)
The excess metal
40
What gas is produced by reacting a metal with an acid?
Answer
(C)
Hydrogen
41
What product will form if copper(II) sulfate is reacted with sodium hydroxide?
Answer
(A)
Blue precipitate
42
Which observation would confirm the presence of carbon dioxide gas?
Answer
(A)
It turns limewater cloudy.
43
In a flame test, the color of the flame is indicative of:
Answer
(C)
The cation present
44
What is the main purpose of an indicator in a titration?
Answer
(B)
To signal the end point.
45
Which ion produces a lilac flame in a flame test?
Answer
(B)
Potassium
46
Which of the following is the most appropriate method to make the salt copper sulfate?
Answer
(B)
Adding copper oxide to sulfuric acid
47
What is the main function of the filter paper during the process of making a salt from a metal reacting with an acid?
Answer
(A)
To remove the solid excess metal
48
What is observed when testing for the presence of a cation, such as copper(II), with sodium hydroxide solution?
Answer
(B)
A blue precipitate forms
49
What gas has a strong, acidic smell?
Answer
(B)
Sulfur dioxide
50
In a titration, the indicator will signal the completion of the reaction with what?
Answer
(A)
A change in color