Density of materials

Question 1

What is density ?

Answer 1

measure of the ‘ compactness ‘ of a substance . It relates to mass of a substance to how much space it takes up.

Unit = kg/m^3 or g/cm^3

Question 2

1 g/cm^3 =

Answer 2

1000 kg/m^3

Question 3

density formula

Answer 3

mass / volume

Question 4

density of an object depends on ..

Answer 4

what’s it made of and how the particles are arranged

In dense material = particles are packed tightly together

less dense material = particles are more spread out together

density varies between different states of matter, solids are generally more dense than liquid and gas is less dense than liquid

Question 5

PRACTICAL to find density of a solid object

STEPS 1-5

Answer 5

1) use balance to measure its mass
2) if it’s a regular solid, measure Length, width and height with an appropriate piece of equipment like a ruler. Calculate volume using relevant formula of your shape.
3) for an irregular shape, find volume by submerging it in a eureka can filled with water. The water displaced by the object will be transferred to measuring cylinder.
4) record volume of water in measuring cylinder, this is the volume of the object.

5) plug objects mass and volume into formula to work out density

Question 6

PRACTICAL to find density of a liquid

STEPS 1-5

Answer 6

1) place measuring cylinder on balance and zero the balance
2) Pour 10ml of the liquid into the measuring cylinder and record its mass
3) pour another 10 ml into measuring cylinder and repeat the process until the cylinder is full and recording total volume and mass each time

4) For each measurement, work out density ( 1ml = 1 cm^3)

5) find average of your calculated densities which will give you a value for density of liquids