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- 1. Multiple Choice
The atomic number of element Z is 9 and its mass number is 19. In which group of the Periodic Table should element Z be placed?
Group 0
Group I
Group VII
Group II
- 2. Multiple Choice
Element M contains 4 electrons in its outer shell and 125 neutrons in its nucleus. What is element M?
Beryllium
Carbon
Tin
Lead
- 3. Multiple Choice
Aluminium forms the ion Al 3+. Which noble gas has the same electronic structure as this ion?
Krypton
Neon
Helium
Argon
- 4. Multiple Choice
Substances can be broadly classified into three categories which are elements, compounds and mixtures.
Which of the following statements is correct?
Elements contain different atoms
Compounds consist of elements that are not chemically combined
Mixtures consist of elements that are chemically combined
A mixture can contain elements and compounds
- 5. Multiple Choice
What change occurs to an atom when it forms a negative ion?
It loses electrons.
It gains protons.
It gains electrons.
It loses protons.
- 6. Multiple Choice
Which element does not form a stable ion with the same electronic configuration as neon?
Magnesium
Fluorine
Sodium
Chlorine
- 7. Multiple Choice
Calcium reacts with fluorine to form calcium fluoride Which statement describes what happens to calcium atoms in this reaction?
Calcium ions lose electrons to form positive charges.
Calcium atoms gain 3 electrons to form positive ions.
Calcium ions gain 2 electrons to form positive ions.
Calcium atoms lose 2 electrons to form positive ions.
- 8. Multiple Choice
The bonding present in a substance determines the structure and properties of that substance. Which of the following statements is a correct description of the structure of an ionic compound?
A lattice structure with an irregular arrangement of alternating positive and negative ions
A lattice structure with a regular arrangement of alternating positive and negative ions
A random structure with a regular arrangement of alternating positive and negative ions
A random structure with an irregular arrangement of alternating positive and negative ions
- 9. Multiple Choice
The atom of element Z has 6 electrons in its outer shell. How would this element react?
It shares two electrons with four from another atom to form two covalent bonds
It shares four electrons with four from another atom to form four covalent bonds
It shares four electrons with two from another atom to form two covalent bonds
It shares two electrons with two from another atom to form two covalent bonds
- 10. Multiple Choice
Which of the following compounds are formed by covalent bonding?
Potassium fluoride
Propane
Carbon dioxide
Lithium bromide
- 11. Multiple Choice
CH4 , H2O and HCl are covalent compounds. Which atoms in these compounds do not use all of their outer shell electrons in bonding?
C and O
C and H
Cl and O
Cl and C
- 12. Multiple Choice
Which statement about bonding is not correct?
Covalent bonding involves non metal elements.
Covalent bonding involves electron sharing.
Covalent bonding involves electron transfer.
Covalent bonding does not involve metal elements.
- 13. Multiple Choice
Which of the following molecules contains only single covalent bonds?
N2
F2
O2
CO2
- 14. Multiple Choice
A student analysed an ionic compound and a covalent compound using a melting point apparatus. She found the ionic compound had a much higher melting point than the covalent compound.
Which statement explains this observation?
Ionic compounds are formed from metals only
Ionic compounds are formed from nonmetals and nonmetals.
There are strong electrostatic forces of attraction in ionic compounds.
There are strong intermolecular forces in ionic compounds.
- 15. Multiple Choice
Ammonia is a covalent compound consisting of one nitrogen atom bonded to three hydrogen atoms.
Which statement is correct for a molecule of ammonia?
The number of shared pairs of electrons is five
The number of shared pairs of electrons is three
There are single covalent bonds between the hydrogen atoms.
Each hydrogen atom donates one pair of electrons to the central nitrogen atom
- 16. Multiple Choice
Which of the following statements about graphite and diamond are incorrect?
1.They are allotropes of carbon.
2.They both conduct electricity.
3.They form different numbers of bonds within their structures.
4.They have different uses
2 and 3
2 only
1, 3 and 4
2 and 4
- 17. Multiple Choice
Which statement correctly describes the structure of macromolecules?
Giant molecular crystal which is held together by weak intermolecular forces
Giant molecular crystal which is held together by strong ionic bonds.
Giant molecular crystal which is held together by weak metallic bonds
Giant molecular crystal which is held together by strong covalent bonds.
- 18. Multiple Choice
Which statement correctly describes the arrangement of atoms in silicon dioxide?
Each silicon atom is bonded to two oxygen atoms and each oxygen atom is bonded to one silicon atom.
Each silicon atom is bonded to four oxygen atoms and each oxygen atom is bonded to two silicon atoms.
Each silicon atom is bonded to four oxygen atoms and each oxygen atom is bonded to four silicon atoms.
Each silicon atom is bonded to two oxygen atoms and each oxygen atom is bonded to four silicon atoms.
- 19. Multiple Choice
Graphite is used to produce electrodes due to its ability to conduct electricity. What other property does graphite have that makes it useful for this application?
Graphite is an unreactive substance and doesn’t react with the electrolyte.
Graphite is soft and easy to shape into electrodes.
Graphite has a low melting point due to the weak forces in between the layers.
Graphite dissolves readily in water.
- 20. Multiple Choice
Metals are malleable and ductile and can be hammered and pulled into useful shapes. Which statement correctly explains these properties?
Layers of atoms in the metal lattice are rigid and held strongly together so they cannot move.
Layers of atoms in a metal can slide over one another and break the attractive forces that hold them together.
Layers of atoms in a metal can slide over one another and new attractive forces are formed between the metal ions and the delocalised electrons.
Layers of atoms in a metal cannot slide over one another and the attractive forces between the metal ions and the delocalised electrons are unbreakable.
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