10 minutes maximum! (can you do it in 5?)

Grab a calculator  time for some maths! 
Density is a measure of how compact the particles are in a substance.

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^{}


2. This metal cube of side 2cm has a mass of 32g.
The density is
 A. 2 g/cm^{3}
 B. 4 g/cm^{3}
 C. 8 g/cm^{3}
 D. 16 g/cm^{3}



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 46. These questions are about the densities of different substances.
What are the missing values? 


Substance 
Density (g/cm^{3})

Mass (g) 
Volume (cm^{3}) 
4. 
Glass 

9 
6 
5. 
Lead 
11.3 

200 
6. 
Wood 
0.8 
80 


7. Floating or sinking depends on density.
The density of water is 1 g/cm^{3}.
The density of this block is is 1.1 g/cm^{3}.
This means that if you put this cube in water it will... 


 A. .. float because it has a density higher than ^{}1 g/cm^{3}.
 B. .. float because it has a density lower than ^{}1 g/cm^{3}.
 C. .. sink because it has a density higher than ^{}1 g/cm^{3}.
 D. .. sink because it has a density lower than ^{}1 g/cm^{3}.


Q810.
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. The density of the ball is:
 A. 0.47 g/cm^{3}
 B. 3.50 g/cm^{3}
 C. 0.91 g/cm^{3}
 D. 1.10 g/cm^{3}


10. If the ball is cut in half and the experiment repeated, the density will
. 
