Topic Covalent bonding : the covalent challenge! Level GCSE (or any course for students aged 14-16) Outcomes 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 5-34 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 H2 HF HCl CH4 SiF4 H2O NH3 O2

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.