1
CLASS NOTES FOR CHEMISTRY – REVISION
EXERCISES WITH ANSWERS
Inorganic Revision Exercise 1: Chapters 1 - 9
Important: Before you look at the answers/solutions, first try each question.
Otherwise you won’t learn anything!
Section A: Multiple Choice Questions.
For each of the following questions four possible answers (a, b, c. and d) are given. Choose
the one that you consider to be the correct answers to each question.
1) Which one of the following is not an example of a type of matter?
(a) solids (b) solutions (c) liquids (d) gases.
2) The correct symbol for an element which is a transition metal is:
(a) Na (b) Fe (c) As (d) Al
3) Which one of the following symbols represents an element that is NOT a noble gas?
(a) Kr (b) He (c) Ne (d) Rb
4) Which one of the following symbols represents a non-metallic element that is a solid
and occurs in the fifth period of the Periodic Table?
a) C (b) I (c) Bi (d) Ag
5) Which of the following changes is NOT a chemical change?
(a) water to steam (b) carbon to carbon dioxide (c) hydrogen to water
(d) nitrogen to ammonia
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6) Given the following symbol: X . X represents an atom of phosphorus that contains
15
(a) 15 protons, 16 neutrons and 16 electrons
(b) 15 protons, 31 neutrons and 16 electrons
(c) 16 protons, 16 neutrons and 16 electrons
(d) 15 protons, 16 neutrons and 15 electrons.
7) Magnesium and calcium are found in the same group of the Periodic Table, because
(a) they are both metals (b) they have similar electron structures (c) they are
transition metals (d) they both have 20 nucleons in their atoms
8) An atom is stable because
(a) the protons and electrons attract each other (b) it is so small (c) it contains
neutrons (d) it consists of protons and electrons
, 2
9) A compound is a substance that
(a) consists of two or more different atoms or ions held together by strong bonds (b)
consists of molecules only (c) cannot be split into simpler substances (d) can
only be a solid
10) Which one of the following statements is FALSE?
(a) elements can also form molecules (b) molecules contain two or more atoms
(c) P4 is a diatomic molecule (d) compounds consist of different elements
11) Given the formula Na2Cr2O7. Which one of the following statements is FALSE?
(a) The name of the compound is sodium dichromate. (b) The formula contains 11
atoms. (c) It represents a compound containing 3 elements. (d) It represents a
covalent compound.
12) Which one of the following statements is CORRECT?
(a) A molecule can only contain two or more different elements. (b) BF3 is a binary
compound. (c) A compound consists of two different atoms. (d) 2H2
represents four molecules.
13) Given the following electron configuration:
↑ ↑ ↑ 2p
2s
↑↓
1s
↑↓
(a) It can also be given as 1s2 2s22p3 (b) The second energy level contains 3
electrons (c) The valency of this atom is 5. (d) The second energy level contains
3 valence electrons
14) Which one of the following statements is FALSE?
(a) The noble gases do not form compounds. (b) An octet structure is a stable
arrangement. (c) An atom with an octet structure will not form bonds with other
atoms. (d) A helium atom does not have an octet structure.
15) Which one of the following statements is TRUE? Atoms always combine
(a) to form compounds (b) to obtain maximum energy (c) to obtain maximum
stability (d) to form covalent compounds
16) Hydrogen is found in Group 1 of the Periodic Table because
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(a) it acts like an alkali metal (b) it is the lightest element (c) it is the first
element. (d) an atom of hydrogen has only one electron
17) The energy required to remove an electron from an atom is called
(a) the ionisation energy (b) electron affinity (c) the stabilisation energy (d) the
ionic energy
18) The ionic bonding between berillium and fluorine is formed by a berillium atom
(a) losing two electrons and two fluorine atoms gaining one electron each
(b) losing two electrons and a fluorine atom gaining two electrons
(c) sharing two electrons with two fluorine atoms
(d) sharing two electrons with one fluorine atom
19) The formula vir aluminium phosphate is
(a) Al2PO4(b) Al3( PO4)2 (c) Al(PO4)2 (d) AlPO4
20) (NH4)2CO3 is the formula for
(a) nitrogen hydrogen carbonate (b) ammonium hydrogen carbonate
(c) ammonium carbonate (d) dinitrogen carbonate
21) An example of a polyatomic cation is the
(a) dichromate ion (b) ammonia ion (c) ammonium ion (d) ammonium
chloride ion
22) How many bond pairs are there in the Lewis structure for O 2?
(a) 1 (b) 2 (c) 3 (d) 4
23) The valence shell for a sulfur atom is the main energy level given by
(a) n=1 (b) l=2 (c) n=3 (d) l=3
24) In the reaction equation A + B →C + D
(a) A and B must be elements (b) A and B must be compounds (c) C must
be a compound (d) C and D can both be compounds
25) Which one of the following represents an addition reaction?
(a) AB → A + B (b) A + B →C + D (c) AB → CD
(d) A + B → AB
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Section B: Structured questions
1) Define
(a) matter;
(b) a chemical change;
(c) a positive catalyst.
2) Answer the following questions on Group VIIA of the Periodic Table:
(a) Name three elements that occur in this group and give their chemical symbols.
(b) What name is given to this group?
(c) Name an element in this group that is a liquid at room temperature.
3) What is an element and what is the difference between an element and a compound?
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4) An element is described by the following symbolic notation 25 X
(a) What is the name of this element?
(b) How many electrons does an atom of element X have?
(c) How many nucleons does an atom of X have?
(d) In what period of the Periodic Table does X occur?
5) (a) List as many characteristics as you can of an atom with special reference to its
sub-atomic particles: their properties, their numbers, their charges and their masses.
(b) Why is an atom stable?
6) (a) Distinguish between groups and periods of the Periodic Table.
(b) Name an element that occurs in the fifth period of the Periodic Table and is a
precious metal.
7) Distinguish between a physical and a chemical change and give one example of
each.
8) Say which of the following notations does or do not represent molecules: Cl 2 ; P4 ; H2O
; Fe ; NH3 ; 2Al
9) Say for each of the following statements whether it is TRUE or FALSE. Correct any
false statement(s)
(a) H2 and HCl both represent molecules.
(b) H2 and HCl both contain two atoms
(c) H2 and HCl are both poliatomic molecules
Given the formula KMnO4.
(d) The formula represents a compound.
(e) There are three atoms present in the formula.
CLASS NOTES FOR CHEMISTRY – REVISION
EXERCISES WITH ANSWERS
Inorganic Revision Exercise 1: Chapters 1 - 9
Important: Before you look at the answers/solutions, first try each question.
Otherwise you won’t learn anything!
Section A: Multiple Choice Questions.
For each of the following questions four possible answers (a, b, c. and d) are given. Choose
the one that you consider to be the correct answers to each question.
1) Which one of the following is not an example of a type of matter?
(a) solids (b) solutions (c) liquids (d) gases.
2) The correct symbol for an element which is a transition metal is:
(a) Na (b) Fe (c) As (d) Al
3) Which one of the following symbols represents an element that is NOT a noble gas?
(a) Kr (b) He (c) Ne (d) Rb
4) Which one of the following symbols represents a non-metallic element that is a solid
and occurs in the fifth period of the Periodic Table?
a) C (b) I (c) Bi (d) Ag
5) Which of the following changes is NOT a chemical change?
(a) water to steam (b) carbon to carbon dioxide (c) hydrogen to water
(d) nitrogen to ammonia
31
6) Given the following symbol: X . X represents an atom of phosphorus that contains
15
(a) 15 protons, 16 neutrons and 16 electrons
(b) 15 protons, 31 neutrons and 16 electrons
(c) 16 protons, 16 neutrons and 16 electrons
(d) 15 protons, 16 neutrons and 15 electrons.
7) Magnesium and calcium are found in the same group of the Periodic Table, because
(a) they are both metals (b) they have similar electron structures (c) they are
transition metals (d) they both have 20 nucleons in their atoms
8) An atom is stable because
(a) the protons and electrons attract each other (b) it is so small (c) it contains
neutrons (d) it consists of protons and electrons
, 2
9) A compound is a substance that
(a) consists of two or more different atoms or ions held together by strong bonds (b)
consists of molecules only (c) cannot be split into simpler substances (d) can
only be a solid
10) Which one of the following statements is FALSE?
(a) elements can also form molecules (b) molecules contain two or more atoms
(c) P4 is a diatomic molecule (d) compounds consist of different elements
11) Given the formula Na2Cr2O7. Which one of the following statements is FALSE?
(a) The name of the compound is sodium dichromate. (b) The formula contains 11
atoms. (c) It represents a compound containing 3 elements. (d) It represents a
covalent compound.
12) Which one of the following statements is CORRECT?
(a) A molecule can only contain two or more different elements. (b) BF3 is a binary
compound. (c) A compound consists of two different atoms. (d) 2H2
represents four molecules.
13) Given the following electron configuration:
↑ ↑ ↑ 2p
2s
↑↓
1s
↑↓
(a) It can also be given as 1s2 2s22p3 (b) The second energy level contains 3
electrons (c) The valency of this atom is 5. (d) The second energy level contains
3 valence electrons
14) Which one of the following statements is FALSE?
(a) The noble gases do not form compounds. (b) An octet structure is a stable
arrangement. (c) An atom with an octet structure will not form bonds with other
atoms. (d) A helium atom does not have an octet structure.
15) Which one of the following statements is TRUE? Atoms always combine
(a) to form compounds (b) to obtain maximum energy (c) to obtain maximum
stability (d) to form covalent compounds
16) Hydrogen is found in Group 1 of the Periodic Table because
, 3
(a) it acts like an alkali metal (b) it is the lightest element (c) it is the first
element. (d) an atom of hydrogen has only one electron
17) The energy required to remove an electron from an atom is called
(a) the ionisation energy (b) electron affinity (c) the stabilisation energy (d) the
ionic energy
18) The ionic bonding between berillium and fluorine is formed by a berillium atom
(a) losing two electrons and two fluorine atoms gaining one electron each
(b) losing two electrons and a fluorine atom gaining two electrons
(c) sharing two electrons with two fluorine atoms
(d) sharing two electrons with one fluorine atom
19) The formula vir aluminium phosphate is
(a) Al2PO4(b) Al3( PO4)2 (c) Al(PO4)2 (d) AlPO4
20) (NH4)2CO3 is the formula for
(a) nitrogen hydrogen carbonate (b) ammonium hydrogen carbonate
(c) ammonium carbonate (d) dinitrogen carbonate
21) An example of a polyatomic cation is the
(a) dichromate ion (b) ammonia ion (c) ammonium ion (d) ammonium
chloride ion
22) How many bond pairs are there in the Lewis structure for O 2?
(a) 1 (b) 2 (c) 3 (d) 4
23) The valence shell for a sulfur atom is the main energy level given by
(a) n=1 (b) l=2 (c) n=3 (d) l=3
24) In the reaction equation A + B →C + D
(a) A and B must be elements (b) A and B must be compounds (c) C must
be a compound (d) C and D can both be compounds
25) Which one of the following represents an addition reaction?
(a) AB → A + B (b) A + B →C + D (c) AB → CD
(d) A + B → AB
, 4
Section B: Structured questions
1) Define
(a) matter;
(b) a chemical change;
(c) a positive catalyst.
2) Answer the following questions on Group VIIA of the Periodic Table:
(a) Name three elements that occur in this group and give their chemical symbols.
(b) What name is given to this group?
(c) Name an element in this group that is a liquid at room temperature.
3) What is an element and what is the difference between an element and a compound?
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4) An element is described by the following symbolic notation 25 X
(a) What is the name of this element?
(b) How many electrons does an atom of element X have?
(c) How many nucleons does an atom of X have?
(d) In what period of the Periodic Table does X occur?
5) (a) List as many characteristics as you can of an atom with special reference to its
sub-atomic particles: their properties, their numbers, their charges and their masses.
(b) Why is an atom stable?
6) (a) Distinguish between groups and periods of the Periodic Table.
(b) Name an element that occurs in the fifth period of the Periodic Table and is a
precious metal.
7) Distinguish between a physical and a chemical change and give one example of
each.
8) Say which of the following notations does or do not represent molecules: Cl 2 ; P4 ; H2O
; Fe ; NH3 ; 2Al
9) Say for each of the following statements whether it is TRUE or FALSE. Correct any
false statement(s)
(a) H2 and HCl both represent molecules.
(b) H2 and HCl both contain two atoms
(c) H2 and HCl are both poliatomic molecules
Given the formula KMnO4.
(d) The formula represents a compound.
(e) There are three atoms present in the formula.
