• Quick retrieval from earlier learning (Heating and cooling: can the change be undone?). Students answer on mini whiteboards.
• Show answers together and note who needs support in the main task.

1. Can this change be undone: chocolate melting in a warm hand? (can change back / cannot change back) → can change backPrompt: Could you get the starting material back by warming it or cooling it?
2. Three of these changes CANNOT be undone. Which one is different? (baking a cake / butter softening in a warm kitchen / popping popcorn / burning a log on a fire) → butter softening in a warm kitchenPrompt: Think about melting and freezing versus cooking and burning.
3. Ice cream is left in the sun and melts. Then it is put back in the freezer. Is it the same as before? (It freezes solid again, though it may be icier and harder than before. / It stays a liquid in the freezer. / It turns into milk powder. / It burns.) → It freezes solid again, though it may be icier and harder than before.Prompt: Is melting a change that can be reversed?

• Show an ice cube melting and a kettle steaming and ask what is the same and what is different.
• Share the objective: What happens when we heat it?. Read the success criteria together.

• Work through the example out loud, saying why you do each step, not just what you do.
• Example: What happens when you heat this: butter in a hot pan?
• Step 1: So the answer is: melts into a liquid
• Answer: melts into a liquid
• Pause after each step and ask a student to say what comes next.

• Do these together. Students try each step on whiteboards before you reveal it.
• Use the hints as prompts rather than giving the answer.

1. What happens when you heat this: cake batter in the oven? (turns white and firm / rises and becomes a spongy solid / turns brown and crunchy / melts into a liquid) → rises and becomes a spongy solidPrompt: Picture it cooking or warming in the kitchen.
2. Why do cooks put butter in a warm pan before frying? (Heat turns butter into ice. / Heat melts the solid butter so it can spread over the pan. / Butter cools the pan. / Butter turns into a gas straight away.) → Heat melts the solid butter so it can spread over the pan.Prompt: What does heat do to many solids?

• Students work on the student sheet. Circulate and check the first two answers of every student early.
• Students who finish: write a question of their own for a partner, with the answer.

The 6 questions are on the student sheet below, with answers in the key.

• Two questions on their own. Sort answers into got it / nearly / not yet to plan the next lesson.

1. True or false? Heating water enough makes it boil. (True / False) → TruePrompt: Some heated things melt, some cook. Can they change back?
2. Why do cooks put butter in a warm pan before frying? (Heat melts the solid butter so it can spread over the pan. / Butter cools the pan. / Heat turns butter into ice. / Butter turns into a gas straight away.) → Heat melts the solid butter so it can spread over the pan.Prompt: What does heat do to many solids?

Free online practice with hints and printable worksheets for this skill: eurekami.com/science/grade-2.