1What is matter? Why are shadow, heat and light not matter?
2What is density? Write its formula and both of its units.
3Between a piece of iron and a piece of wood of the same volume, which has the greater mass, and why?
4A gold ring and a gold bar have the same density. Explain why.
5If the mass of a stone with volume 2 m³ is 5000 kg, what is the density of the stone?
6How many kg of water are needed to fill a drum of volume 6 m³, if the density of water is 1000 kg/m³?
7What is the mass of a piece of aluminium of volume 2 m³, if the density of aluminium is 2700 kg/m³?
8Why is 1 g/cm³ the same as 1000 kg/m³?
9Why should the empty container be weighed before measuring the density of a loose material?
10Why does the same sand give a higher density when it is pressed down in the box?