Chapter 3 Quiz ⚗️
Matter · 10 MCQ + 5 Open-Ended
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✏️ Section B — Open-Ended Questions
Write your answer first, then reveal the model answer to check.
Q11
Describe an experiment to show that air has mass. [2]
Use a balance with an inflated ball on one pan and a deflated ball on the other. The balance tilts towards the inflated ball, showing it has greater mass. Since the only difference is the air inside the inflated ball, we conclude that air has mass.
Q12
State the difference between a liquid and a gas in terms of (i) volume and (ii) compressibility. [2]
- Volume: A liquid has a definite volume; a gas does not have a definite volume.
- Compressibility: A liquid cannot be compressed; a gas can be compressed.
Q13
A stone is lowered into a measuring cylinder containing 40 cm³ of water. The water level rises to 65 cm³. What is the volume of the stone? Explain how you found your answer. [2]
Volume of stone = 65 − 40 = 25 cm³.
The stone takes up space in the water, pushing the water level up. The rise in water level equals the volume of the stone (displacement method).
The stone takes up space in the water, pushing the water level up. The rise in water level equals the volume of the stone (displacement method).
Q14
An empty beaker has a mass of 60 g. After pouring a liquid into it, the total mass is 130 g. What is the mass of the liquid? Show your working. [2]
Mass of liquid = total mass − mass of empty beaker
= 130 − 60 = 70 g
= 130 − 60 = 70 g
Q15
Sam investigates whether the shape of an object affects its mass. He uses three objects made of the same material and the same size but different shapes.
(a) State the variable to be changed. [1]
(b) State TWO variables to keep the same. [2]
(a) State the variable to be changed. [1]
(b) State TWO variables to keep the same. [2]
(a) The shape of the object.
(b) Any two of:
(b) Any two of:
- The material the objects are made of
- The size of the objects
- The electronic balance used to measure mass