Fill in each blank with the correct word from the lesson.

1. These are _______ changes: the material's identity is unchanged, only its form, size, or state has altered.
2. Some _______ can be undone — ice melts into water, but freeze it again and you get ice back.
3. Vaporisation converts liquid to gas; _______ is the reverse.
4. _______ converts solid directly to gas — camphor and dry ice do this.
5. When you cut an _______ bar into smaller pieces, you still have iron.

Choose the best option for each question.

1. Which of these is a physical change?
   a) Burning woodb) Rusting ironc) Melting iced) Cooking an egg
2. What is sublimation?
   a) Liquid turning to gasb) Solid turning directly to gasc) Gas turning to liquidd) Solid turning to liquid
3. What happens to a substance's chemical identity in a physical change?
   a) It changes completelyb) It remains the samec) It splits into two substancesd) It absorbs new elements

Write T for True or F for False in the brackets.

1. Melting ice is one of the key concepts in the lesson on Physical Changes.
2. Burning wood is the main topic of this lesson.
3. Solid turning directly to gas is one of the key concepts in the lesson on Physical Changes.
4. Liquid turning to gas is the main topic of this lesson.

1. In your own words, explain what Physical Changes means.
2. List two things you learned from this lesson on Physical Changes.