Grade 5 Science Practice Test: Physical and Chemical Changes and Conservation of Mass
- Physical and Chemical Changes, Conservation of Mass
- 10 questions
- 13 minutes
Ten questions on physical changes, chemical changes and conservation of mass. Tip: if a new substance forms, it is a chemical change; if the substance only changes shape or state, it is physical.
Tap an option to mark your answer. You can change your mind, or tap the same option again to leave the question blank. The correct answers and explanations appear when you finish the test.Tap an option to answer; tap it again to leave the question blank.
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Question 1
Which of these is a chemical change?
Correct answer: B
Baking makes new substances that give bread its crust and smell, and it cannot be undone. Melting, cutting and freezing only change shape or state.
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Question 2
A copper statue slowly turns from shiny brown to green after many years outdoors.
What kind of change is this?
Correct answer: D
Copper reacts with gases and water in the air and forms a new green substance on its surface. A color change caused by a new substance is evidence of a chemical change.
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Question 3
A steel wool pad is sealed in a jar with air. The jar and everything inside have a mass of 250 g. After a week, the steel wool has rusted.
What is the mass of the sealed jar now?
Correct answer: C
In a sealed jar, no matter can get in or out. The iron joins with oxygen from the air inside the jar, so the total mass stays 250 g.
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Question 4
Students burn a sheet of paper in an open metal dish. The ash left over weighs much less than the paper did.
Where did most of the missing mass go?
Correct answer: A
Burning turns most of the paper into gases such as carbon dioxide and water vapor that escape into the air. The matter is not destroyed; it is just no longer on the dish.
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Question 5
Which of these is a physical change?
Correct answer: B
Steam is still water, just in the gas state, so boiling is a physical change. Souring, burning and rusting all make new substances.
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Question 6
A puddle on the playground is gone by the afternoon.
What happened to the water?
Correct answer: C
Evaporation turns liquid water into water vapor, an invisible gas. The water particles still exist; they are now spread out in the air.
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Question 7
Two clear liquids are poured together. A white solid appears and sinks to the bottom.
What does this most likely show?
Correct answer: D
A solid appearing when two liquids mix is a sign that a new substance formed. Freezing would need cold, and evaporation would not make a solid at the bottom.
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Question 8
Why is frying an egg a chemical change?
Correct answer: A
Heat changes the substances in the egg into new ones, so the clear part turns white and stays that way. Ice melts back into water, but a cooked egg never turns raw again.
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Question 9
A student mixes 40 g of one powder with 60 g of water in a closed bottle. They react, but nothing leaves the bottle.
What is the total mass of the material inside after the reaction?
Correct answer: D
Mass is conserved in a closed container: 40 g + 60 g = 100 g. Even though new substances form, the same matter is still in the bottle.
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Question 10
Which statement about conservation of mass is true?
Correct answer: B
Matter is never created or destroyed in physical or chemical changes. Mass only seems to change when something, like a gas, enters or escapes.
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