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Reversible and irreversible changes

5th grade (Year 6 in England) · 16 questions · Common Core: NGSS.2-PS1-4, NGSS.5-PS1-4 · England: KS2 Y5 Properties and changes of materials

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Date

Score/ 16

1
Question 1
Which change is irreversible?
- A. melting butter
- B. freezing water into ice
- C. an iron nail rusting
- D. melting chocolate
2
Question 2
Which is a sign that a new material has been made?
- A. a puddle dries up
- B. ice changes to water
- C. bubbles of gas are given off when two substances mix
- D. sugar disappears in tea
3
Question 3
Is this change reversible or irreversible: cooking an egg?
- A. reversible
- B. irreversible
4
Question 4
Which change is irreversible?
- A. dissolving salt in water
- B. freezing water into ice
- C. melting chocolate
- D. toasting bread
5
Question 5
Why is burning a candle wick irreversible?
- A. The wick only melts
- B. It can be turned back into a wick by cooling
- C. Nothing new is made
- D. New substances such as carbon dioxide and ash form
6
Question 6
Is this change reversible or irreversible: mixing vinegar and bicarbonate of soda (baking soda)?
- A. reversible
- B. irreversible
7
Question 7
Which change is irreversible?
- A. melting butter
- B. boiling water into steam
- C. mixing vinegar and bicarbonate of soda (baking soda)
- D. freezing water into ice
8
Question 8
Melted candle wax sets hard again when it cools. This change is…
- A. burning
- B. a chemical reaction
- C. reversible
- D. irreversible
9
Question 9
Is this change reversible or irreversible: burning wood?
- A. reversible
- B. irreversible
10
Question 10
Which change is reversible?
- A. cooking an egg
- B. burning wood
- C. melting chocolate
- D. an iron nail rusting
11
Question 11
Why is burning a candle wick irreversible?
- A. Nothing new is made
- B. It can be turned back into a wick by cooling
- C. The wick only melts
- D. New substances such as carbon dioxide and ash form
12
Question 12
Is this change reversible or irreversible: cooking an egg?
- A. reversible
- B. irreversible
13
Question 13
Which change is reversible?
- A. burning wood
- B. mixing vinegar and bicarbonate of soda (baking soda)
- C. melting chocolate
- D. toasting bread
14
Question 14
Why is burning a candle wick irreversible?
- A. Nothing new is made
- B. The wick only melts
- C. New substances such as carbon dioxide and ash form
- D. It can be turned back into a wick by cooling
15
Question 15
Is this change reversible or irreversible: mixing vinegar and bicarbonate of soda (baking soda)?
- A. reversible
- B. irreversible
16
Question 16
Which change is irreversible?
- A. boiling water into steam
- B. cooking an egg
- C. melting chocolate
- D. dissolving salt in water

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