Grade 9 Science: Calculating Density
This worksheet focuses on understanding and calculating the density of various substances, including real-world examples and practical applications.
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Calculating Density
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Read each question carefully and answer to the best of your ability. Show all your work for calculation problems.
1. Density is defined as per unit .
2. The formula for density is D = / .
3. The SI unit for mass is , and for volume, it is .
4. Which of the following would have the greatest density?
10g of feathers in 10 cm³
10g of lead in 1 cm³
5g of water in 5 cm³
20g of air in 200 cm³
5. An object floats in water if its density is:
Greater than water's density
Less than water's density
Equal to water's density
Irrelevant to water's density
6. A block of wood has a mass of 120 grams and a volume of 150 cm³. Calculate its density. Show your work.
7. A liquid has a density of 0.8 g/mL. If you have 200 mL of this liquid, what is its mass? Show your work.
8. An irregularly shaped rock has a mass of 450 grams. When placed in a graduated cylinder containing 100 mL of water, the water level rises to 250 mL.
a) What is the volume of the rock? Show your work.
b) Calculate the density of the rock. Show your work.
9. Density is a measure of how much space an object occupies.
True
False
10. The density of a substance changes with its shape.
True
False
11. Explain why a large ship made of steel can float on water, while a small pebble sinks.