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Essential Chemistry for IGCSE - Formulae And Equations (Section 6)

1
What are the products of the reaction between magnesium and oxygen?
Answer
(A)
Magnesium oxide
2
What is the correct formula for magnesium chloride?
Answer
(B)
MgCl2
3
What is the chemical symbol for oxygen?
Answer
(A)
O
4
Which of the following is a common state symbol?
Answer
A
B
C
5
Which of the following is a correct chemical formula?
Answer
(D)
All of the above
6
Which of the following statements are true regarding chemical equations?
Answer
A
B
C
7
Which of the following is the correct formula for aluminum oxide?
Answer
(D)
Al2O3
8
What is the oxidation state of the magnesium in the compound magnesium sulfate?
Answer
(B)
+2
9
Which of the following could be the products in the reaction between hydrochloric acid and calcium carbonate?
Answer
A
B
C
10
What is the name of the compound whose formula is MgO?
Answer
(A)
Magnesium oxide
11
Which of the following is the formula for water?
Answer
(C)
H2O
12
What is the name of the compound with the formula SO2?
Answer
(B)
Sulfur dioxide
13
What is the formula for Iron(III) oxide?
Answer
(B)
Fe2O3
14
Which of the following shows the correct charges and formulas for the ions present in sodium chloride?
Answer
(C)
Na+ and Cl-
15
If a reaction produces a gas, what state symbol would you use?
Answer
(C)
(g)
16
What are the characteristics of acids?
Answer
A
B
D
17
In a chemical equation, the reactants are shown on which side of the arrow?
Answer
(A)
Left
18
Which of the following are produced when a metal reacts with an acid?
Answer
A
B
19
What is the formula for potassium iodide?
Answer
(B)
KI
20
What is an example of an ionic compound?
Answer
(B)
Sodium chloride