Alkanes and Alkenes

Worked examples (6)

• 1Write a complete-combustion equation (Getting started)
• 2Write a substitution equation and state the condition (Getting started)
• 3Write an incomplete-combustion equation (Building confidence)
• 4Explain substitution versus addition (Building confidence)
• 5Name the organic product of substitution (Stretch)
• 6Balance combustion of a larger alkane (Stretch)

Model answers (6)

• ✓Model answer — 4WSD0/1C style
• ✓Model answer — 4WSD0/1C style
• ✓Model answer — 4WSD0/1C style
• ✓Model answer — 4WSD0/1C style
• ✓Model answer — 4WSD0/1C style — extended
• ✓Model answer — 4WSD0/1C style — extended

Worked examples (6)

• 1What makes a compound an alkane? (Getting started)
• 2Use CₙH₂ₙ₊₂ to find a formula (Getting started)
• 3Draw a displayed formula (Building confidence)
• 4Read a condensed formula (Building confidence)
• 5Draw the isomers of C₄H₁₀ (Stretch)
• 6Draw the three isomers of C₅H₁₂ (Stretch)

Model answers (6)

• ✓Model answer — 4WSD0/1C style
• ✓Model answer — 4WSD0/1C style
• ✓Model answer — 4WSD0/1C style
• ✓Model answer — 4WSD0/1C style
• ✓Model answer — 4WSD0/1C style — extended
• ✓Model answer — 4WSD0/1C style — extended

Worked examples (6)

• 1Define saturated and unsaturated (Getting started)
• 2Classify a hydrocarbon from its bonds (Getting started)
• 3Explain why alkenes are more reactive (Building confidence)
• 4Describe the bromine water test (Building confidence)
• 5Identify two unknown hydrocarbons (Stretch)
• 6Explain why the alkane gives no change (Stretch)

Model answers (6)

• ✓Model answer — 4WSD0/1C style
• ✓Model answer — 4WSD0/1C style
• ✓Model answer — 4WSD0/1C style
• ✓Model answer — 4WSD0/1C style
• ✓Model answer — 4WSD0/1C style — extended
• ✓Model answer — 4WSD0/1C style — extended

Worked examples (6)

• 1Define an alkene (Getting started)
• 2Use CₙH₂ₙ to write a formula (Getting started)
• 3Draw the displayed formula of ethene (Building confidence)
• 4Identify the alkene from formulae (Building confidence)
• 5Explain why there is no one-carbon alkene (Stretch)
• 6Draw butene and confirm the formula (Stretch)

Model answers (6)

• ✓Model answer — 4WSD0/1C style
• ✓Model answer — 4WSD0/1C style
• ✓Model answer — 4WSD0/1C style
• ✓Model answer — 4WSD0/1C style
• ✓Model answer — 4WSD0/1C style — extended
• ✓Model answer — 4WSD0/1C style — extended

Worked examples (6)

• 1Write the equation for ethene + bromine (Getting started)
• 2Identify an addition reaction (Getting started)
• 3Describe the bromine water test (Building confidence)
• 4Addition with hydrogen and steam (Building confidence)
• 5Distinguish two hydrocarbons (Stretch)
• 6Explain why an alkane does not react (Stretch)

Model answers (6)

• ✓Model answer — 4WSD0/1C style
• ✓Model answer — 4WSD0/1C style
• ✓Model answer — 4WSD0/1C style
• ✓Model answer — 4WSD0/1C style
• ✓Model answer — 4WSD0/1C style — extended
• ✓Model answer — 4WSD0/1C style — extended