Revision activities / Chemistry study practice
Learning focus: Organic Chemistry. This original Grade 11 Chemistry exercise gives you a task, a suggested response and a follow-up challenge. It is classroom practice, not an official assessment paper.
Understand the idea
A homologous series groups compounds with a related general formula and chemical behaviour. Naming requires attention to carbon number and the type of bonding or functional group.
Try the activity
Name CH₄, C₂H₆ and C₂H₄. Explain why the third compound belongs to a different series from the first two.
Attempt your response before opening the guidance. Show the steps, textual evidence or reasons that support your answer; a final answer alone may hide a misunderstanding.
Your practice workspace
Your work and progress stay in this browser. Use Clear this activity to remove saved work.
Show suggested answer and reasoning
CH₄ is methane, C₂H₆ is ethane and C₂H₄ is ethene. Methane and ethane are alkanes; ethene is an alkene with a carbon–carbon double bond.
Follow-up challenge
Draw displayed formulae and count each atom. Explain why the molecular formula alone is not always sufficient to distinguish structural isomers in larger compounds.
Review your work
- Did you answer the question actually asked?
- Can you explain the method or evidence in your own words?
- What would you change if one condition in the task changed?
Use the suggested response to identify one correction, then attempt the task again without copying it. For an open-ended question, other well-supported answers may be reasonable. Ask your teacher to check interpretations or language forms where needed.
Continue Chemistry practice
Back to the subject guide · Check available member notes and downloads
Match this activity to the learning outcomes and sequence in your school’s current Grade 11 curriculum-design collection. This activity is a focused learning example, not a complete curriculum map.
WhatsApp us