10 minutes maximum! Can you do it in 5?

1. Which of these is the correct formula for density?

• A. density = mass x volume
• B. density = mass ÷ volume
• C. density = volume ÷ mass
• D. density = volume - mass

Q2+3:

This metal cube of side 2cm has a mass of 32g. 2. The density is ...

• A. 2 g/cm3
• B. 4 g/cm3
• C. 8 g/cm3
• D. 16 g/cm3

3. If you heated the cube it would expand a little. This would make ....

• A. the mass increase and therefore the density increase.
• B. the mass increase and therefore the density decrease.
• C. the volume increase and therefore the density decrease.
• D. the volume increase and therefore the density increase.

Q 4-6. These questions are about the densities of different substances.

What are the missing values?

 Substance Density (g/cm3) Mass (g) Volume (cm3) Glass ? 54 5.4 0.66 1.5 9 6 Lead 11.3 ? 226 2260 0.58 17.7 200 Wood 0.8 80 ? 64 100 10 0.01

7. Floating or sinking depends on density.

The density of water is 1 g/cm3.

The density of this block is is 1.1 g/cm3. This means that if you put this block in water it will...
• A. float because it has a density higher than 1 g/cm3.
• B. float because it has a density lower than 1 g/cm3.
• C. sink because it has a density higher than 1 g/cm3.
• D. sink because it has a density lower than 1 g/cm3.

Q8-10.

A green ball has been put into the measuring cylinder shown, and the water level has risen. 8. The water has been...

• A. dispersed.
• B. displaced.
• C. diffracted.
• D. diffused.
9. Using measurements from the diagram above, what is the density of the ball?
• A. 0.47 g/cm3
• B. 3.50 g/cm3
• C. 0.91 g/cm3
• D. 1.10 g/cm3
10. If the ball is cut in half and the experiment repeated, the density will   .