You know the chemistry. You studied the topic. Then your SAC comes back with half marks on a question you thought you nailed.

Often the problem is not knowledge. It is the command word. "Explain", "justify" and "evaluate" each ask for something different, and a great answer to the wrong command still loses marks.

This guide shows you what the common VCE Chemistry command words ask for, and how to build a strong extended response answer step by step.

Why command words matter

Examiners write marking guides around the command word. Each mark is tied to a specific idea or step. If you do not show it, you cannot earn it, however much correct chemistry you add.

Think of the command word as an instruction from the examiner. Following it exactly is the fastest way to lift your marks without learning new content.

The common command words, in plain language

These are practical meanings, not official definitions. Check them against the VCAA glossary and your teacher's guidance.

• Identify or name: Give the answer only. No explanation needed.
• State: A short, direct answer. One line is usually enough.
• Describe: Say what happens or what something looks like. Include key features, observations or steps. You do not need to give reasons.
• Outline: A brief description of the main points.
• Explain: Give the reason or mechanism. Say what happens and why, linking cause to effect.
• Compare: Show similarities and differences, both sides, in the same terms.
• Justify: Make a claim and support it with evidence or chemical reasoning.
• Discuss: Look at more than one factor or point of view, and weigh them.
• Evaluate: Judge how good, effective or valid something is, using evidence.
• Calculate: Show working, use correct units, and use sensible significant figures.

A quick test: if your answer would still make sense without the word "because", and the command was "explain", you have probably only described.

What is an extended response question?

Extended response questions give more marks and need more than a sentence. They often ask you to use data, link ideas from different parts of the course, or evaluate an experiment.

Students lose marks here for three reasons. They ramble. They skip steps in the reasoning. Or they do not answer the exact question asked.

A five-step method for extended response

Use this method on every practice question until it feels automatic.

1. Circle the command word and the key terms

Underline what the question wants and what chemistry it involves. Note the marks. A 4-mark question needs roughly four distinct points.

2. Plan in 20 seconds

Jot down the points you need, in order. Even three quick bullet points stop you drifting.

3. Start with a direct answer

Open with the claim. For example, "Equilibrium shifts to the right because..." Do not warm up with background.

4. Link every claim to chemistry

Use the right terms: collision frequency, activation energy, oxidation, electrolyte, and so on. Then connect the dots. Each sentence should lead to the next with a clear "so" or "because".

5. Check against the question

Reread the stem. Did you use the data given? Did you answer every part? Did you include units?

This is the thinking behind our signature Novicate Answering Strategy. It gives students a repeatable process for breaking down questions and matching the marking criteria, so they are not guessing what the examiner wants.

Worked example: describe versus explain

Imagine a question: "Explain why increasing the temperature increases the rate of a reaction."

A weak answer: "The reaction goes faster when it is hot." That only describes.

A stronger answer: "At higher temperature, particles have more kinetic energy. A greater proportion of collisions have energy equal to or greater than the activation energy, and collisions are also more frequent. So more collisions are successful each second and the rate increases."

Notice the structure. Cause, mechanism, result. Each sentence earns its place.

Practise with past questions

Here is a simple way to build the skill:

1. Pick 5 extended response questions from past exams.
2. Write each answer under timed conditions.
3. Mark them with the examiner's report beside you.
4. Highlight each mark in the guide. Which ones did you miss?
5. Rewrite the answer so it earns every mark.

Rewriting is the step most students skip, and it is where the learning happens. If you want help deciding how many papers to do, read how many VCE practice exams to do. For more subject advice, try VCE Biology and Chemistry tips from a Raw 50 scorer.

Common command word mistakes

• Writing a long description when the question says "explain".
• Giving one side when the question says "compare".
• Making a claim with no evidence when it says "justify".
• Forgetting to use the data in the question.
• Leaving out units or significant figures on a "calculate" question.

How Novicate can help

Our VCE Chemistry 3/4 program runs online via Zoom in small groups of around 12. Every class is recorded and topic tests follow each unit of work. Students learn to read the question, plan, and write answers that match the marking criteria.

If you are in Units 1/2, our Chemistry 1/2 program builds these skills early. It is offered in both Gold and Silver.

Novicate students average Raw 42+ (top 6% in Victoria), and 8 in 10 students score Raw 40+ (top 9%). Curious how we teach this? Book a free trial class.

FAQ

What are the most common VCE Chemistry command words?

You will see identify, state, describe, outline, explain, compare, justify, discuss, evaluate and calculate all the time. Learn what each one needs and practise answering to it.

What is the difference between describe and explain in Chemistry?

Describe says what happens. Explain says why it happens. If you can add "because" and a chemical reason, you are explaining.

How long should an extended response answer be?

Long enough to earn the marks, and no longer. Match your points to the marks available. A clear, structured paragraph beats a page of loosely related facts.

Should I use bullet points in extended response?

Check with your teacher. Many questions reward connected reasoning, which flows better in short, clear sentences. Bullet points can work for listing steps, but they may not show the links between ideas.

How can I practise command words without a tutor?

Take past questions, circle the command word, and write your answer. Then compare it with the examiner's report and rewrite it. Repeat weekly.