Density And Determing Density - State Of Matter

Question 1

What does density tell you?

Answer 1

How many of an objects particles are squished into a given space.

Question 2

How can the particle model explain density?

Answer 2

Density is a measure of how much mass is in a certain space.
You can work out density using density = mass divided by volume
The density of an object depends on what its made of and how its particles are arranged.
A dense material has its particles packed tightly together.
So solids are generally denser than liquids, which are denser than gases.

Question 3

How to find the density of a regular shaped object (e,g cuboid)

Answer 3

Use a balance to measure its mass
Measure its length, width and height with a ruler
Then calculate its volume using formula for that shape - eg cuboid ; length x width x height
Use density = mass divided by volume to find density.

Question 4

How to find density of an irregularily shaped object (e,g awards statue)

Answer 4

Use a balance to measure its mass
Fill a eureka can (can with spout on side) with water.
Place a measuring cyliner under spout.
Place your object into water, which will push some of the water out through the spout.
Measure the volume of water that has collected in measuring cyliner.
This is equal to volume of object.
Use the formula ( density = mass divided by volume) to find objects density.

Question 5

How do you find density of a liquid?

Answer 5

Place a measuring cylinder on a balance and zero the balance
Pour 50ml of the liquid into meausing cyliner.
Record liquids mass shown on mass balance
Use the formula above to find density, the volume is 50cm^3 or 0.00005m^3
For this experiment you will need to know 1ml = 1cm^3, or 0.0000001m^3.