U3: Physical and Chemical Changes (SCH4U)

credits: Hannah_Thomas434

1. What is a physical change?

A change where no new substance is formed.

2. What is a chemical change?

A change where a new substance is formed.

3. Is melting ice a physical or chemical change?

Physical change.

4. Why is melting ice a physical change?

No new substance is formed; only the state changes.

5. Is rusting iron a physical or chemical change?

Chemical change.

6. Why is rusting iron a chemical change?

A new substance, rust, forms.

7. Is burning wood a physical or chemical change?

Chemical change.

8. Why is burning wood a chemical change?

New substances like ash and gas form.

9. Is boiling water a physical or chemical change?

Physical change.

10. Why is boiling water a physical change?

It changes state but stays as water.

11. Is freezing juice a physical or chemical change?

Physical change.

12. Why is freezing juice a physical change?

No new substance forms; it just becomes solid.

13. Is cooking an egg a physical or chemical change?

Chemical change.

14. Why is cooking an egg a chemical change?

New substances form when proteins change.

15. Is cutting paper a physical or chemical change?

Physical change.

16. Why is cutting paper a physical change?

It changes shape but remains paper.

17. Is baking a cake a physical or chemical change?

Chemical change.

18. Why is baking a cake a chemical change?

New substances form from the ingredients.

19. Is dissolving sugar in water a physical or chemical change?

Physical change.

20. Why is dissolving sugar in water a physical change?

No new substance forms; sugar can be recovered.

21. Is digesting food a physical or chemical change?

Chemical change.

22. Why is digesting food a chemical change?

New substances form inside the body.

23. Is tearing cloth a physical or chemical change?

Physical change.

24. Why is tearing cloth a physical change?

Only size and shape change.

25. Is lighting a match a physical or chemical change?

Chemical change.

26. Why is lighting a match a chemical change?

New substances and energy are produced.

27. Is evaporation a physical or chemical change?

Physical change.

28. Why is evaporation a physical change?

Only the state of matter changes.

29. Is tarnishing silver a physical or chemical change?

Chemical change.

30. Why is tarnishing silver a chemical change?

New substances form on the silver's surface.

31. Is breaking glass a physical or chemical change?

Physical change.

32. Why is breaking glass a physical change?

No new substance forms, only smaller pieces.

33. Is frying an egg a physical or chemical change?

Chemical change.

34. Why is frying an egg a chemical change?

New substances form when proteins are heated.

35. Is mixing vinegar and baking soda a physical or chemical change?

Chemical change.

36. Why is mixing vinegar and baking soda a chemical change?

Gas forms, showing a new substance.

37. Is crushing a can a physical or chemical change?

Physical change.

38. Why is crushing a can a physical change?

Only the shape changes.

39. Is rotting fruit a physical or chemical change?

Chemical change.

40. Why is rotting fruit a chemical change?

New substances form during decomposition.

41. Is condensation a physical or chemical change?

Physical change.

42. Why is condensation a physical change?

The state changes from gas to liquid.

43. Is photosynthesis a physical or chemical change?

Chemical change.

44. Why is photosynthesis a chemical change?

New substances like glucose are formed.

45. Is chopping wood a physical or chemical change?

Physical change.

46. Why is chopping wood a physical change?

It changes size but stays wood.

47. Is bleaching hair a physical or chemical change?

Chemical change.

48. Why is bleaching hair a chemical change?

The color changes due to new substances forming.

49. Is inflating a balloon a physical or chemical change?

Physical change.

50. Why is inflating a balloon a physical change?

Only size and shape change.

51. Is cooking pasta a physical or chemical change?

Chemical change.

52. Why is cooking pasta a chemical change?

The starch reacts with heat and water.

53. Is dissolving salt in water a physical or chemical change?

Physical change.

54. Why is dissolving salt in water a physical change?

No new substance forms; it's reversible.

55. Is milk souring a physical or chemical change?

Chemical change.

56. Why is milk souring a chemical change?

New substances form when bacteria act on milk.

57. Is shaving wood a physical or chemical change?

Physical change.

58. Why is shaving wood a physical change?

It only changes shape and size.

59. Is corroding metal a physical or chemical change?

Chemical change.

60. Why is corroding metal a chemical change?

A new substance forms on the metal surface.

61. Is ice cream melting a physical or chemical change?

Physical change.

62. Why is ice cream melting a physical change?

No new substance forms; it changes state.

63. Is burning paper a physical or chemical change?

Chemical change.

64. Why is burning paper a chemical change?

Ash and gases form, showing new substances.

65. Is sharpening a pencil a physical or chemical change?

Physical change.

66. Why is sharpening a pencil a physical change?

It changes shape but stays the same material.

67. Is fermenting grapes a physical or chemical change?

Chemical change.

68. Why is fermenting grapes a chemical change?

New substances form like alcohol and gas.

69. Is boiling an egg a physical or chemical change?

Chemical change.

70. Why is boiling an egg a chemical change?

The proteins permanently change form.

71. Is mixing sand and water a physical or chemical change?

Physical change.

72. Why is mixing sand and water a physical change?

No new substance forms; they can be separated.

73. Is making ice cubes a physical or chemical change?

Physical change.

74. Why is making ice cubes a physical change?

Water changes state but stays the same substance.

75. Is burning gasoline a physical or chemical change?

Chemical change.

76. Why is burning gasoline a chemical change?

It forms new substances like CO₂ and water vapor.

77. Is folding paper a physical or chemical change?

Physical change.

78. Why is folding paper a physical change?

No new substance forms, only shape changes.

79. Is digesting starch a physical or chemical change?

Chemical change.

80. Why is digesting starch a chemical change?

New molecules form during digestion.

81. Is sanding wood a physical or chemical change?

Physical change.

82. Why is sanding wood a physical change?

Only the texture changes, not the material.

83. Is baking bread a physical or chemical change?

Chemical change.

84. Why is baking bread a chemical change?

New substances form due to heat and reactions.

85. Is condensation of steam a physical or chemical change?

Physical change.

86. Why is condensation of steam a physical change?

Only the state changes from gas to liquid.

87. Is bleaching clothes a physical or chemical change?

Chemical change.

88. Why is bleaching clothes a chemical change?

Color changes due to a chemical reaction.

89. Is grinding coffee beans a physical or chemical change?

Physical change.

90. Why is grinding coffee beans a physical change?

Only the size changes.

91. Is frying potatoes a physical or chemical change?

Chemical change.

92. Why is frying potatoes a chemical change?

New substances form and color changes.

93. Is dissolving oxygen in water a physical or chemical change?

Physical change.

94. Why is dissolving oxygen in water a physical change?

No new substance forms; it's reversible.

95. Is cooking rice a physical or chemical change?

Chemical change.

96. Why is cooking rice a chemical change?

New substances form as starch reacts with water.

97. Is sublimation of dry ice a physical or chemical change?

Physical change.

98. Why is sublimation of dry ice a physical change?

Only the state changes from solid to gas.

99. Is exploding fireworks a physical or chemical change?

Chemical change.

100. Why is exploding fireworks a chemical change?

New substances and energy are produced.