Alkenes

• Chemistry
• Secondary Education
• Age 12,13

Chemistry of Alkenes

Organic Chemistry 

06 March 2024

• create a quick slide presentation describing the cracking of long-chain hydrocarbons and the properties of alkenes
• use the structural and displayed formulae of alkenes in describing its reactions with hydrogen, steam, and halogens
• recognise the reason of cracking long-chain hydrocarbons into smaller and useful chains

Our Learning Goals

Chemistry of Alkenes

Organic Chemistry 

06 March 2024

What are alkenes?

• unsaturated hydrocarbons
• contain at least one carbon-carbon double bond (C=C)
• form the homologous series 
• general formula: CnH2n

Physical Properties of Alkenes

• similar to that of alkanes
• can exhibit isomerism

Reactivity of Alkenes

• more reactive because they are unsaturated
• C=C bond contains a σ bond and a π bond 

Chemistry of Alkenes

Organic Chemistry 

06 March 2024

• Goal and Expected Output: Given your tasks, your team must create a reaction poster about alkenes. 
• Standards : organisation, content, delivery, response to question
  

Collaborative Activity

• Team 1 - Catalytic cracking
• Team 2 - Combustion of alkenes
• Team 3 - Bromination (Ethene + Ethanolic Br2)
• Team 4 - Bromination (Ethene + Aqueous Br2)
• Team 5 - Hydrogenation
• Team 6 - Catalytic addition of steam

REACTIONS

Prac 2.4 - Types of chemical reactions

Topic 6. Chemical Energetics 

04 March 2024

• Standing up while performing any reactions involving heating.
• Be careful when heating the magnesium - do not look directly at the flame.
• Wear eye protection throughout.
• Silver nitrate solution is a moderate hazard and harmful to the aquatic environment. Waste from experiments using silver nitrate must not be poured down the drain.
• Copper (II) sulfate is a moderate hazard and harmful to the aquatic environment. Waste from experiments using copper (II) sulfate must not be poured down the drain.
• Copper (II) carbonate is harmful if swallowed, an irritant, and harmful to the aquatic environment. Waster from experiments using copper (II) carbonate must not be poured down the drain.

SAFETY ⚠️

Materials Checklist

Which among the 5 experiments does not show a chemical change?

Experimental Question

Write your team hypothesis or prediction.

Hypothesis

Prac 2.4 - Types of chemical reactions

Topic 6. Chemical Energetics 

04 March 2024

Follow the steps on pages 71 and 72 of your practical workbook.

Experiment Proper

• Standing up while performing any reactions involving heating.
• Be careful when heating the magnesium - do not look directly at the flame.
• Wear eye protection throughout.
• Silver nitrate solution is a moderate hazard and harmful to the aquatic environment. Waste from experiments using silver nitrate must not be poured down the drain.
• Copper (II) sulfate is a moderate hazard and harmful to the aquatic environment. Waste from experiments using copper (II) sulfate must not be poured down the drain.
• Copper (II) carbonate is harmful if swallowed, an irritant, and harmful to the aquatic environment. Waster from experiments using copper (II) carbonate must not be poured down the drain.

SAFETY ⚠️

• Wash the materials you used.
• Clean your table.
• Return the washed/ cleaned materials.

Clean-up

Prac 2.4 - Types of chemical reactions

Topic 6. Chemical Energetics 

04 March 2024

• Share the results of your experiment.
• What similarities and differences have you noticed?

Wrap-up