1. Chemical Sciences
Resources disc
Agenda

2. Science Understanding
BIG SCIENCE IDEA: Interaction and Change
Materials
Materials have Physical properties
Materials can undergo reversible changes
Change of State
Combining/Mixing
Separation
Materials have Chemical Properties
Materials can undergo irreversible changes
Chemical reactions/new substances
Types of Chemical reactions
Look at Australian Curriculum Year 7 Content
Look at scope and sequence: prior learning and extension
What are the BIG SCIENCE IDEAS?
Do Prediction Chart
Floating Rainbows

3. Take a deep breath in. Discussion What are you breathing in?
Either read this out or explain to the kids in your own words.

4. Look in the glass. Discussion What do you think is in the glass?
Either read this out or explain to the kids in your own words.

5. So, what is our shared understanding of a ‘mixture’?
Discussion
So, what is our shared understanding of a ‘mixture’?
Either read this out or explain to the kids in your own words.

6. Mixtures and Prediction
Record in your science book your current definition of a mixture.
Paste in your book and complete the mixtures prediction chart.
Record any questions and anything your are wondering at this point.
Either read this out or explain to the kids in your own words.

7. Oil and Water Activity
Wait for instructions before completing each step
Half fill a container with water and add enough cooking oil to form a ½ cm layer.
Place the lid on the container
Shake the container
Either read this out or explain to the kids in your own words.

8. Oil and Water Activity
Describe what happened when the oil and water were shaken. (Use words and pictures)
________________________________________________ ________________________________________________ ________________________________________________ ________________________________________________ ________________________________________________ ________________________________________________
Either read this out or explain to the kids in your own words.

9. Oil and Water Activity
Describe what happened when the food colouring was added to the jar with oil and water. (Use words and pictures)
________________________________________________ ________________________________________________ ________________________________________________ ________________________________________________ ________________________________________________ ________________________________________________
Either read this out or explain to the kids in your own words.

10. Oil and Water Activity
Wait for instructions before completing each step
Add a few drops of food colouring to the container
Observe and discuss with your partner
Place the lid on the container and shake. Observe for 2 minutes
Either read this out or explain to the kids in your own words.

11. Oil and Water Activity
Describe what happened when the container was shaken and left to sit for 2 minutes (use words and pictures)
________________________________________________ ________________________________________________ ________________________________________________ ________________________________________________ ________________________________________________ ________________________________________________
Either read this out or explain to the kids in your own words.

12. Oil and Water Activity Answer the following in full sentences
Which liquid did the food colouring mix with?
Do oil and water form a mixture? Explain your choice.
Is it more likely that food colouring contains water or oil? Why?
Either read this out or explain to the kids in your own words.

13. Oil and Water Activity
Add a few drops of detergent to the container. Observe and describe what happened.
________________________________________________ ________________________________________________ ________________________________________________ ________________________________________________ ________________________________________________ ________________________________________________
Either read this out or explain to the kids in your own words.

14. Oil and Water WHAT'S HAPPENING?
Even when you mix oil and water together they still separate. The oil always floats to the top because it is less dense than water.
Oil and water don’t mix because water molecules are more attracted to each other than to oil molecules.
Detergent molecules are attracted to both water and oil. When you add the detergent, one end of each detergent molecule attaches to a water molecule and the other attaches to an oil molecule.
The detergent creates a mixture of water with droplets of oil spread through it.
Detergent is attracted to both oil and water because one end is hydrophilic (or ‘water-loving’) and sticks to water and the other end is hydrophobic and sticks to oil.
When we add detergent to oil and water and shake the mixture, the liquids are held to each other by the detergent molecules and form an emulsion. An emulsion is a stable mixture of two or more liquids that would not normally mix.
Either read this out or explain to the kids in your own words.

15. Miscible and Immiscible
Record this in your science vocabulary
Miscible = mix together
Immiscible = do not mix together
Water and food colouring are miscible
Water and oil are immiscible

16. What is a Mixture?
A Combination of two or more pure substances or materials that are mixed together. …But, the substances must be ale to be separated.

17. What are Mixtures? Sorting Activity Sort images into categories
mixed evenly;
not mixed evenly; and
unsure.
Now try to determine what properties all items in each category have in common.
A whole group discussion about "tricky" items follows
Finally, as a group, the items are sorted and displayed under the headings Homogenous and heterogeneous mixtures on a chart.

18. What are the different characteristics of these mixtures?

22. What are Mixtures?
Mixtures can be homogeneous or heterogeneous. A homogeneous mixture has the same uniform appearance and composition throughout. Many homogeneous mixtures are commonly referred to as solutions. A heterogeneous mixture consists of visibly different substances or phases. In a heterogeneous mixture the substances are clearly visible because the particles do not mix evenly.

23. Bath Bombs Making the bath bombs 3:33 – 5:17
Watch the clip
Do Bubble Mixture investigation
Making the bath bombs 3:33 – 5:17
Testing the bombs 11:05 – 12:30

24. Bath Bombs Pour ½ cup of baking soda to the bowl
Add ¼ cup citric acid to the bowl
Mix super well (or it won’t detonate)
Add 4 drops of food colouring
Pour in 1 tablespoon of witch hazel
Mix well
Optional: add olive or lavender oil
Divide evenly and mould 4 bombs
Clean up your mess!

25. Resources
Resources
Mixtures Activity

26. Assessment Tasks Resources
Part 1 Record your understanding of a mixture. Paste in your Science book and complete the mixtures prediction chart. Record any questions and anything your are wondering at this point. Part 2 Draw and label the 3 diagrams, including detailed observations from the water-oil-food colouring activity Your definition of miscible and immiscible. Part 3 Test your bath bomb and record your observations. You should include details as to why you think a chemical reaction is taking place. Your response should be more than 4 sentences and could include a diagram.