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WorksheetsIsca Chemistry: Giant Covalent, Metallic and Formula Mass
Total questions: 26
Worksheet time: 36mins
Which of these is NOT covalently bonded?
Diamond
Silicon dioxide (SiO2)
Sodium chloride (NaCl)
Graphite
Covalent molecules form between...
Two non-metals
Two metals
A metal and a non-metal
Covalent molecules form when...
Atoms gain or lose electrons
Pairs of electrons are shared
There is a sea of delocalised electrons
The different arrangements of atoms in different forms of an element is called...
A giant covalent structure
A diamond
An allotrope
An isotope
Which of these is NOT an allotrope of carbon?
Diamond
Buckminster fullerene
Graphite
Poly(ethene)
Diamond's properties include (tick all the correct boxes)
Good conductor of electricity
Hard
Good thermal conductor
Good lubricant
The properties of graphite include (tick all the correct boxes)
Good electrical conductor
Hard
Used in cutting tools
Good lubricant
Diamond has 4 strong covalent bonds between each carbon atom. This makes it...
Hard
Soft
A good electrical conductor
A good lubricant
Diamond is an electrical insulator because...
It is hard
It is used in cutting tools
It has no free electrons
It has a high melting point
Why does diamond have such a high melting point?
It is hard.
It is useful in cutting tools
It is a good electrical insulator
It has strong covalent bonds
Graphite is a good conductor of electricity because...
It is soft
it has free electrons in its structure
It is a good lubricant
It's layers slide over one another
Which of the following has the lowest boiling point?
Carbon dioxide (CO2)
Silicon dioxide (SiO2)
Diamond
Graphite
Why does CO2 have a low boiling point?
It has strong covalent bonds between the carbon and oxygen atoms
It is a gas
It needs a lot of energy to boil it
It has weak forces between the small molecules
Metals conduct electricity well because...
They have a high melting point
They are malleable
They are made of metal atoms
There are free, delocalised electrons
'A' shows...
A positive metal ion
Delocalised electrons
A metallic bond
An ionic bond
'B' shows...
A positive metal ion
Delocalised electrons
A metallic bond
An ionic bond
Properties of metals include... (select all the correct answers)
They are malleable
They are sonorous
They are lustrous
They conduct electricity
Metals are malleable because...
There are delocalised electrons
They can conduct electricity
They have high melting points
Metal ions can slide over one another
Metals can conduct electricity because...
There are delocalised electrons
There are strong metallic bonds
They have high melting points
Metal ions can slide over one another
On a periodic table, the mass number for an element or atom is always...
The top number
The bottom number
The biggest number
The smallest number
To work out the relative formula mass of a compound (Mr) you...
Just count the atoms
Add up all the atomic numbers for the atoms
Add up all the mass numbers for the atoms
For each atom, multiply the mass number by the number of atoms, and add them all up
Work out the relative formula mass (Mr) for CO2. Just write the number.
(a)
Work out the relative formula mass (Mr) for Cl2 (chlorine). Just write the number.
(a)
Work out the relative formula mass (Mr) for Al2O3 (aluminium oxide). Just write the number.
(a)
Work out the relative formula mass (Mr) for CaCO3 (calcium carbonate). Just write the number.
(a)
Work out the relative formula mass (Mr) for Ca(OH)2 (calcium hydroxide). Just write the number.
(a)
