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28 September, 02:23

Sort the following situations into chemical change or physical change:

1. salt dissolves in water

2. Hydrochloric acid reacts with magnesium to produce hydrogen gas

3. a piece of copper is cut in half

4. a sugar cube is ground up

5. water is heated and changed to steam

6. iron rusts

7. ethyl alcohol evaporates

8. ice melts

9. milk sours

10. sugar dissolves in water

11. sodium and potassium react violently with water

12. pancakes cook on a griddle

13. grass grows on a lawn

14. a tire is inflated with air

15. food is digested in the stomach

16. water is absorbed by a paper towel

17. ethyl alcohol boils at 79 egress Celsius

18. paper burns

19. water freezes at 0 degrees Celsius

20. fireworks explode

21. alka-seltzer gives off carbon dioxide when added to water

22. clouds form in the sky

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Answers (1)
  1. 28 September, 03:04
    0
    Chemical

    2. Hydrochloric acid reacts with magnesium to produce hydrogen gas

    5. water is heated and changed to steam

    6. iron rusts

    9. milk sours

    7. ethyl alcohol evaporates

    11. sodium and potassium react violently with water

    12. pancakes cook on a griddle

    15. food is digested in the stomach

    17. ethyl alcohol boils at 79 egress Celsius

    18. paper burns

    20. fireworks explode

    21. alka-seltzer gives off carbon dioxide when added to water

    22. clouds form in the sky

    Physical

    19. water freezes at 0 degrees Celsius

    16. water is absorbed by a paper towel

    14. a tire is inflated with air

    13. grass grows on a lawn

    1. salt dissolves in water

    3. a piece of copper is cut in half

    4. a sugar cube is ground up

    8. ice melts

    10. sugar dissolves in water
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