WorksheetsGCSE 1.3 Structures
Total questions: 30
Worksheet time: 15mins
What is the structure of sodium chloride:
Molecular covalent model
Giant ionic lattice model
Metallic model
Simple molecular model
Select a correct property for a giant ionic lattice:
They are insoluble in water
They are soluble in water
They have low melting points
They are poor conductors of electricity
What type of forces are van der Waals' forces?
Strong ionic forces
Weak intermolecular forces
Strong covalent bonds
Weak metallic bonds
Which of the following is true about many covalent molecular substances?
They are soluble in water
They are insoluble in water
They have high electrical conductivity
They have high melting points
Which of the following is NOT a property of the giant covalent structure of carbon (diamond and graphite)?
Electrical conductivity
Hardness
Malleability
Melting point and boiling point
What is an alloy?
A pure metal
A mixture of two or more elements, at least one of which is a metal
A compound of metals
A single element with metallic properties
What effect do different sizes of atoms in an alloy have on the metallic structure?
They make it easier for layers to slide over each other
They make it more difficult for layers to slide over each other
They have no effect on the structure
They make the alloy softer than pure metals
What is the composition of 24 carat gold?
100% pure gold
75% pure gold
50% pure gold
25% pure gold
How many covalent bonds can carbon form?
Two
Three
Four
Five
What type of bonds hold a giant ionic lattice together?
Covalent bonds
Ionic bonds
Metallic bonds
Hydrogen bonds
In sodium chloride, each sodium ion is surrounded by how many chloride ions?
Four
Five
Six
Seven
Which of the following properties is true for most ionic compounds?
They have low melting and boiling points.
They are good conductors of electricity when solid.
They dissolve in water.
They are generally insoluble in water.
What type of intermolecular forces exist between covalent molecular structures?
Ionic bonds
Covalent bonds
Metallic bonds
van der Waals' forces
Which of the following is NOT a property of covalent molecular structures?
They have low melting and boiling points.
They conduct electricity.
They are generally insoluble in water.
They are gases at room temperature.
What is a giant covalent structure?
A structure with weak intermolecular forces.
A three-dimensional structure of atoms joined by covalent bonds.
A structure with free charged particles.
A structure that dissolves easily in water.
Which of the following is an example of an allotrope of carbon?
Sodium chloride
Water
Graphite
Ammonia
Which property is true for diamond?
It conducts electricity.
It has a low melting point.
It is very hard.
It is used in lubricants.
Why is graphite used in lubricants?
It has a high melting point.
It is very hard.
It conducts electricity.
It is soft and allows layers to slide off.
Which of the following statements is true about graphene?
Graphene is a single atom thick layer of diamond.
Graphene is a single atom thick layer of graphite.
Graphene is a single atom thick layer of metal.
Graphene is a single atom thick layer of plastic.
What type of bonds hold the carbon atoms together in graphite?
Ionic bonds
Metallic bonds
Covalent bonds
Hydrogen bonds
Why can graphene conduct electricity?
Because it has free-moving ions.
Because it has delocalised electrons.
Because it has free-moving protons.
Because it has free-moving neutrons.
Which of the following is NOT a property of metals:
High melting and boiling points
Good conductors of electricity
Brittle and easily broken
Malleable and ductile
What is the reason for metals being malleable and ductile?
The layers of ions can slide over each other.
The layers of ions are rigid and fixed.
The layers of ions are held by weak forces.
The layers of ions are held by hydrogen bonds
What is required to break the strong metallic bonds in metals?
Low energy
Substantial energy
No energy
Moderate energy
What is an alloy?
A mixture of two or more elements, at least one of which is a metal and the resulting mixture has metallic properties.
A pure metal with no other elements mixed in.
A compound formed by the chemical reaction of two metals.
A non-metallic mixture of elements.
Why are alloys generally harder than pure metals?
Because the ions/atoms in the alloy are of the same size.
Because the ions/atoms in the alloy are of a different size, making it more difficult for the layers of ions to slide over each other.
Because alloys have fewer ions/atoms than pure metals.
Because alloys are always made with harder metals.
Why is pure gold seldom used in jewellery?
Because it is too expensive.
Because it is too soft and would lose its shape.
Because it is too hard and brittle.
Because it reacts with skin.
How is the purity of gold measured?
In grams.
In carats.
In ounces.
In kilograms.
What is the formula to calculate the percentage of gold in an alloy?
(number of carats / 24) x 100
(number of carats / 100) x 24
(24 / number of carats) x 100
(100 / number of carats) x 24
What are allotropes?
Different forms of the same element in the same physical state
Different elements in the same physical state
Different compounds in the same physical state
Different forms of different elements in different physical states
