The Particle Model 3


Year 10 Topic 1: The Particle Model.
12 Learning Opportunities from Monday the 30th of March until Friday the 8th of May.


Learning Episode 3: Density.
This Learning opportunity has 5 tasks to do.
Target Time: 60 minutes.

Task 1: write your thoughts.
Which object weighs more? 100 tonnes of feathers or a 100 tonnes of bricks?

Why might you think that the 100 tonnes of bricks weighs the most?
List your ideas in your book.
Check your answers at the end of the blog.

Task 2: copy and complete sentences using information.
Copy these sentences and then fill the gaps, using the information below to help you.
Density: is a __________ of how ________ something is for its size.
Different materials have different __________.
To calculate density you need to know the __________ and _________ .
Missing words: Volume, Measure, mass, densities, heavy.
Check your answers at the end of the blog.

Information:
In science, if something is very dense it has a large mass for its volume.
In science, if something is not very dense it has a small mass for its volume.
To calculate the density of something, you need to know: its mass in kg;
its volume in m3 (length x width x depth).

Task 3: Perform some calculations.
Get your calculator ready.
Read the example below, then try the questions.
Check your answers at the end of the blog.
Information
You need to remember this equation and be able to use it so lets practice.
density = mass / volume
Demonstration question:
A block of aluminium has a mass of 5.4 Kg and a volume of 2 m3.
Calculate the density in Kg/m3
density = 5.4 / 2
= 2.7 Kg/m3
Now try these:

Check your answers at the end of the blog.

Task 4: Sort some facts and write them down. Analyse a graph.
Write a list of the five most important facts from the text below.
Put the most important at the top.
Information:

When a liquid changes into a gas, what happens to its density?
The answer is that when a liquid changes into a gas, the spacing between the particles increases.
This also means that the volume will increase too!
As a result, the density of a substance decreases when it changes from a liquid to a gas because … mass / volume = density.
What about water and ice?
Look at this graph and then answer the questions below.
Check your answers at the end of the blog.

Questions:
1) Describe the trend shown in the graph.
2) Explain what it is showing about how the density changes when ice changes state (ice, water, steam)

Task 5: Mark your answers and try the challenge questions!

Task 2: Density is a measure of how heavy something is for its size. Different materials have different densities. To calculate density you need to know the mass and the volume.
Task 3:

Task 4: Between -30oC and 0oC the density is increasing.
When water is a solid it is less dense than when it is in liquid form.
From 0oC to 30oC the density is increasing.
When water is a liquid, it is more dense than when it is a solid.

Challenge Questions:

Extra Challenge:

Answers: