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Essential Chemistry for IGCSE - Formulae And Equations (Section 5)

1
What is the name of the compound with the formula NH3?
Answer
(B)
Ammonia
2
Which of the following compounds is a base?
Answer
(C)
NaOH
3
Which of the following statements are correct regarding ionic compounds?
Answer
A
B
4
What is the charge of a sodium ion?
Answer
(A)
1+
5
In a balanced chemical equation, what is the purpose of balancing the number of atoms?
Answer
(B)
To satisfy the law of conservation of mass.
6
What type of chemical bonds are formed in water molecules?
Answer
(B)
Covalent bonds
7
What is the formula for calcium hydroxide?
Answer
(B)
Ca(OH)2
8
What is the name of the compound formed between sodium and chlorine?
Answer
(A)
Sodium chloride
9
In the reaction: 2Mg + O2 -> 2MgO, what is the ratio of magnesium to magnesium oxide?
Answer
(D)
2:2
10
What is the name of the compound with the formula AgCl?
Answer
(A)
Silver chloride
11
What is the formula of Carbonic acid?
Answer
(A)
H2CO3
12
Which of the following is the formula for methane?
Answer
(A)
CH4
13
What is the name of the compound with the formula CH4?
Answer
(B)
Methane
14
What are the two main types of chemical equations?
Answer
A
B
15
When balancing a chemical equation, what is the one thing you MUST NOT do?
Answer
(B)
Change the subscripts within the chemical formulas.
16
What is the molar mass of water (H2O)? (Assume atomic masses: H=1, O=16)
Answer
(C)
18 g/mol
17
Which of the following is formed when magnesium reacts with hydrochloric acid?
Answer
(A)
Magnesium chloride
18
What is the name of the following compound: CaCO3?
Answer
(A)
Calcium carbonate
19
Which of the following represents the correct formula for sulfuric acid?
Answer
(B)
H2SO4
20
What is the name of the acid with the formula H2SO4?
Answer
(A)
Sulfuric acid
21
What is the chemical symbol for iron?
Answer
(C)
Fe
22
What is the name given to the elements that are in Group 1 of the periodic table?
Answer
(B)
Alkali metals
23
Which of the following is a correct symbol equation for the reaction of hydrogen and oxygen to make water?
Answer
(D)
2H2 + O2 -> 2H2O
24
What is the formula of the compound formed between aluminum and oxygen?
Answer
(D)
Al2O3
25
What is the formula for calcium carbonate?
Answer
(A)
CaCO3
26
What do you call the numbers placed in front of the formulas in a chemical equation?
Answer
(B)
Coefficients
27
Which of the following describes what happens during a chemical reaction?
Answer
(C)
Atoms are rearranged
28
What is the formula for the ammonium ion?
Answer
(C)
NH4+
29
What is the meaning of the symbol (g) in a chemical equation?
Answer
(A)
Gas
30
What are the two main parts of a chemical equation?
Answer
(A)
Reactants and products
31
What is the chemical symbol for silver?
Answer
(A)
Ag
32
What is the chemical symbol for nitrogen?
Answer
(C)
N
33
Which of the following is a common example of a base?
Answer
(C)
NaOH
34
What are the two components of an ionic compound?
Answer
(C)
A metal and a nonmetal
35
What type of bond is formed in an ionic compound?
Answer
(C)
Ionic bond
36
What is the name of the compound with the formula HCl?
Answer
(B)
Hydrogen chloride
37
What is the formula for glucose?
Answer
(A)
C6H12O6
38
What is the name of the process by which a solid changes directly to a gas?
Answer
(B)
Sublimation
39
What is a substance formed when two or more elements are chemically combined?
Answer
(C)
A compound
40
What is the name of the following compound: H2SO4?
Answer
(B)
Sulfuric acid
41
What is the formula for calcium hydroxide?
Answer
(B)
Ca(OH)2
42
Which of the following compounds is formed when magnesium reacts with hydrochloric acid?
Answer
(B)
Magnesium chloride
43
What is the charge of a chlorine ion?
Answer
(B)
1-
44
Which of the following best describes a chemical formula?
Answer
(B)
A representation of the number and type of atoms in a molecule.
45
What is the process where a substance changes from a gas to a liquid?
Answer
(C)
Condensation
46
What is the meaning of the symbol (l) in a chemical equation?
Answer
(A)
Liquid
47
What is the chemical symbol for sulfur?
Answer
(A)
S
48
Which of the following is a property of acids?
Answer
(C)
Reacts with metals to produce hydrogen gas
49
What is the formula for the hydroxide ion?
Answer
(A)
OH-
50
Which of the following is a correct formula for a covalent compound?
Answer
(B)
H2O