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Worksheetscovalent
Total questions: 42
Worksheet time: 30mins
What is a double bond?
a bond between two atoms
one pair of electrons shared between two atoms
two pairs of electrons shared between two atoms
three pairs of electrons shared between two atoms
Which of the following is a Diatomic Molecule?
K2
C2
S2
N2
Many _____ exist as diatomic molecules.
alkali metals
semi-metals
transition metals
non-metals
Which of these is not a covalent molecule?
K2O
CO2
HCl
CH4
What is a covalent bond?
A bond formed between oppositely charged ions
A bond formed when two atoms share a pair of electrons
A bond formed by delocalised electrons
In a dot and cross diagram, what does each dot represent?
A neutron
A proton
An electron
What is the total number of atoms in an CCl4 molecule?
2
3
4
5
Which statement best explains why substances made of small molecules cannot conduct electricity?
They have no charged particles that are free to move from place to place
They cannot move from place to place
They have no charged particles
Ionic bonds are formed from a combination of metal elements and __________________ elements.
non-metal
receive
metal
donate
In the formation of ionic bonds, the electrons will be ____________ from metal elements to non-metal elements.
oppositely
receive
transferred
donate
Which of the below is an ionic compounds?
Ni
MgCl2
H2O
CH4
An example of an ionic compound is Sodium Chloride, which is made from Na+ and Cl- ions. Why do these ions form an ionic bond?
They have like charges
They are from the same group
They are from the same period
They have opposite charges
Lithium is in group 1 of the periodic table, which ion would it form?
Li-
Li2-
Li+
Li2+
Oxygen is in group 6 of the periodic table, which ion would it form?
O-
O+
O2-
O2+
Lead Chloride is an ionic compound, made up from Pb2+ ions and Cl- ions. Which is the correct formula for this compound?
PbCl3
PbCl
PbCl4
PbCl2
Magnesium Hydroxide is an ionic compound made up from Mg2+ and OH- ions. Which is its correct formula?
MgOH
MgOH2
Mg(OH)2
MgO
Which of the following is NOT a property of ionic compounds?
They conduct electricity when molten
They conduct electricity when in solution
They have high boiling points
They are insoluble in water
The following properties are all characteristics of ionic compounds EXCEPT
high melting and boiling points
soft
crystal lattice structure
conduct electricity when dissolved in water
What type of forces hold on an ionic lattice together?
Electrostatic attraction forces
Covalent bond
Metallic bond
Van der Waals forces
Ionic compounds conduct electricity when dissolved in water. Which statement below best explains the property?
Ions are free to move.
Electrons are free to move.
Bonds are strong.
There are weak intermolecular forces of attraction.
True or false? Ionic compounds have high melting points.
true
false
True or false? Ionic compounds conduct electricity when they are in their solid state.
true
false
Metals have positive ions in a ‘sea of electrons’. Which metal atom provides the most electrons for the sea?
Aluminium
Sodium
Calcium
Magnesium
Which statement describes the structure of copper?
It has a lattice of negative ions in a ‘sea of electrons’.
It has a lattice of negative ions in a ‘sea of protons’.
It has a lattice of positive ions in a ‘sea of electrons’.
It has a lattice of positive ions in a ‘sea of protons’
Copper is a metallic element.
Which statements about copper are correct?
Copper is malleable because layers of ions are in fixed positions and cannot move.
The structure of copper consists of negative ions in a lattice.
Copper conducts electricity because electrons can move through the metal.
Electrons hold copper ions together in a lattice by electrostatic attraction.
What is the basis of a metallic bond?
the attraction of neutral metal atoms.
the attraction between protons and neutrons.
the attraction between positive metal ions and interlocking electrons.
the attraction between positive metal ions and free moving electrons.
Why do metals conduct electricity?
They are shiny
The electrons are delocalised and able to move
The electrons are held tightly within the lattice
The electrons are shared between two metal ions
An alloy is harder than its pure metal because the foreign atoms in the alloy
increase the bond strength between the atoms.
increase the empty spaces between the atoms.
react with the pure metal atoms to form a compound.
reduce the ability of the atoms to slide across each other.
Which of the following is not the aim of alloying?
To increase the strength and hardness of metal.
To prevent corrosion of metal.
To improve the appearance of metal
To increase the melting point.
