Topic
Covalent bonding : the
covalent challenge!
Outcomes
1.
Level
GCSE (or any course for students aged
14-16)
Students are able to draw dot and cross diagrams for simple covalent molecules,
including double and triple bonds
This resource was contributed By Deborah Brown
Instructions for teachers: this resource is fantastic, as it allows students to progress at their own
rate as they draw dot and cross diagrams for covalent molecules. Start by printing off the slides 534 two-sided onto paper. You will need at least two sets depending on your class size. Lay these
out around the classroom.
Start by getting students to draw H2 in their books. When they get this correct they can start the
challenge and move around the room to draw dot and cross diagrams of each molecule. They can
check to see if they are right by turning over the card to see the correct answer. If they are
incorrect, they must correct their drawing. Students then move onto the next molecule until all
have been completed.
www.thescienceteacher.co.uk | resources for science teachers who like to think
F2
HF
HCl
CH4
SiF4
H2O
NH3
O2
H2
CO2
SCl2
N2
CS2
C2H4
HCN
H2CO
Show teacher
H2
Draw a dot and cross diagram for hydrogen. When you are correct, you
can start the covalent challenge!
F2
F
F
F
F
Go to HF
HF
H
F
Go to HCl
HCl
Go to CH4
CH4
Go to SiF4
SiF4
F
F
Si
F
F
Go to H2O
H2O
Go to NH3
NH3
Go to O2
O2
Go to CO2
CO2
Go to SCl2
SCl2
S
Cl
Cl
Go to N2
N2
Go to CS2
CS2
S
S
Go to C2H4
C2H4
Go to HC=N
HCN
Go to H2C=O
H2CO
You are an expert!!
Show your teacher.