Density is used to make a fair comparison between materials.

What changes take place to the arrangement of the particles when a solid melts into a liquid?

The particles remain tightly packed and are unable to move past each other

The particles remain tightly packed and are able to move past each other

The particles pack together even closer

In which state of matter are the particles tightly packed in a regular structure?

In a solid

In a liquid

In a gas

What is the equation for density?

Density = Mass × volume

Density = Volume ÷ mass

Density = Mass ÷ volume

What is the density of a rock if it has a mass of 1500 kg and a volume of 0.5 m^{3}?

750 kg/m^{3}

3000 kg/m^{3}

7500 kg/m^{3}

What is the mass of a 5 cm^{3} block of iron that has a density of 7.8 g/cm^{3}?

1.56 g

0.64 g

39 g

What is the mass of 15 cm^{3} volume of material that has a density of 50 g/cm^{3}?

750 g

3.33 g

0.3 g

A block of iron has sides of 3 cm, 4 cm and 5 cm. Its mass is 468 g. What is its density?

39 g/cm^{3}

9.0 g/cm^{3}

7.8 g/cm^{3}

What is the volume of 300 kg of water if it has a density of 1000 kg/m^{3}?

30 m^{3}

3 m^{3}

0.3 m^{3}

A lump of metal of mass 80 g is immersed in a measuring cylinder of water. The reading increases from 20.0 cm^{3} to 49.6 cm^{3}. What is the density of the metal?

1.6 g/cm^{3}

2.7 g/cm^{3}

27 g/cm^{3}

What condition is necessary for an object to float on a liquid?

The object is lighter than the liquid

The object is less dense than the liquid

The liquid is less dense than the object