3.6 and 3.7 i can recall the general formula and displayed formula of alkenes

Name of alkene	Molecular formula	Dot and cross diagram	Displayed formula	State at room temp (25oC)

What is the general formula for alkenes?

1.       Describe and explain the trend in boiling point
The boiling points are lower because unsaturated alkenes have weaker bonds. 

2.       Explain why there is no such compound as methane
 because there is only one carbon in the equivalent alkane and so no carbon carbon double bond can be formed.

3.       How do you quickly identify from the displayed formula that the hydrocarbon is unsaturated?
unsaturated hydrocarbons have a display formula of: CnH2n,, saturated hydrocarbons have twice the amount plus two of hydrogens from carbons 

3.8 I can describe the reaction between alkenes and bromine

1.       Write the word equation showing the reaction between ethene and bromine water

2.       Draw the displayed formula of the reaction above

Take a photo of the answers to 1. and 2. and upload to your blog

3.       Explain the observations

4.       Why does this reaction not need a catalyst?

5.       What type of reaction is this called?

6.       Explain why this reaction is useful

3.5 I can recall the reaction of methane and bromine

Alkanes react with liquid bromine in the presence of UV


Explain why this condition is necessary
Energy is needed for bromine to break. The UV lights tickle the bromine, causing them to gain more energy and eventually breaking them
What is this type of reaction called?
Substitute reaction
State and explain the observation
Liquid bromine changes color from brown/red to colorless. This is because the bromine turns into bromine radacles after they break apart.. Hydrogen bromide is colorless
Draw the displayed formula of the reaction between methane and bromine 

Write out a balanced (with state symbols) the reaction between ethane and chlorine
CL2(L) --> C2H5Cl+ HCL
State and explain the observation in this chemical reaction
Ethane goes from yellow green to colorless.

3.2 and 3.3 I can recall the general formula and displayed formulae of alkenes