Chemical Sciences Resources disc Agenda

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

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

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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

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.

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.

What are the different characteristics of these mixtures?

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.

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

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!

Resources Resources Mixtures Activity http://www.bbc.co.uk/education/guides/zgvc4wx/revision

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.