Higher:
Can make and / or draw models of elements, compounds and mixtures
Middle:
Can describe and explain the differences between them
Lower:
Knows what elements, compounds and mixtures are
Lesson Recap Starter: Think back to the last lesson. What's the difference between physical and chemical change?
Lesson Starter: What is the smallest thing in the world? Discuss your ideas with your talk partner.
Ask 'what is the smallest thing in the world?' Ask children to write an idea down on a sticky note or mini whiteboard and display it to the class.
Presentation - starter slide
Sticky Note / Mini Whiteboard (optional)
Answer questions and take part in activities during the presentation. Stop the presentation at the relevant slides: Talk Partners; AfLs; Songs. Take part in the Choral Response Questions activity (see Assessment section) after the Keywords/Rocket Words slide.
Key Concept:
During this unit, each lesson contains a key concept question housed in the '30 Second Challenge' slide. To help children master this content so the knowledge moves from their short term memory to their long term memory, at the beginning of the follow on lesson the question from the previous lesson is revisited.
The questions covered during this unit include:
1. Explain the difference between filtering, sieving and evaporating.
2. Explain what happens when a substance is dissolved. What does saturated mean?
3. Discuss with your talk partner why some changes to materials are not reversible.
4. What are permanent chemical changes?
5. What's the difference between physical and chemical change?
6. What is the difference between elements, compounds and mixtures?
Presentation
Expert Film: Dr Sam Rowe gives an example of a compound and an example of a molecule involved in the process of photosynthesis.
How we deliver the Gatsby Benchmarks:
2 - Learning from career and labour market information: Pop along to Developing Experts career’s zone to find out about jobs in your area.
4 - Linking curriculum learning to careers: This unit showcases careers that relate to changes to materials. Access our 360° virtual work tours.
7 - Encounters with Further and Higher Education: Pop along to Developing Experts career’s zone to find out about training providers in your area.
Presentation - expert film.
Modelling Elements, Compounds and Mixtures
Watch the Lesson Assignment film to help with this activity.
Use different coloured balls. See resources for how you can adapt, depending on what you have available.
Use the resources to make a series of models which represent either elements, compounds or mixtures. Children to justify their models and explain why they have made them as they have.
Modelling Elements, Compounds and Mixtures
Different coloured balls (can use modelling clay)
Cocktail Sticks
Scissors
Complete the Handout to draw the models made and explain / justify what the models are.
Quiz
With their talk partners, the children are to go through the quiz at the end of the presentation and answer the questions.
Handout
Quiz in presentation
Can children identify the differences between an element, a mixture and a compound?
Can children model elements, mixtures and compounds?
Quizzes in pupil zone.
Unit knowledge organiser and test available in unit docs area.
The difference between compounds and mixtures are…
A compound is created when...
A mixture is created when...
The Science behind the Science:
A molecule is made up of two atoms. Everything that you see is made up of atoms and therefore molecules. Guess what? This does include you as well. On a larger scale of course but it's still pretty crazy.
Atoms that are made up of different types of elements sometimes join. These become molecules that are known as compounds. Let’s take water for example. Water molecules contain molecules that are made of different atoms. Therefore, they contain compounds. They are made up of 2 hydrogen atoms and 1 oxygen atom. Several different types of substances exist even though there are only around 100 types of atoms out there. This is because of the different configurations and the way that they come together. When an atom of the same element comes together, a molecule of that element is formed. An example of a molecule is hydrogen. However, when an atom of a different element joins together, you get a compound. Chemical bonds need to be present for this change to happen. An example of a compound is water.
Here are a few things to remember. Compounds cannot be broken down into smaller and simpler substances by physical reactions. This could include a process such as distillation. They can however be broken down into elements via the following: thermal decomposition, electrolysis and chemical reactions. The properties of compounds are different to the properties of the elements within them. Take water for example. Hydrogen and oxygen are both gases, right? However, water is a liquid. This happens when they come together.
Mixtures are made of molecules of both elements and compounds that are joined together. Unlike compounds, they do not have any chemical bonds. Therefore, they can be separated by filtration, distillation and other processes such as evaporation and chromatography. This is different to compounds that are usually mainly separated by chemical reactions.
Explain that some changes result in the formation of new materials and that this kind of change is not usually reversible, including changes associated with burning and the action of acid on bicarbonate of soda.
Materials - Properties and uses of substances - Having contributed to a variety of practical activities to make and break down compounds, I can describe examples of how the properties of compounds are different from their constituent elements. SCN 3-15b
The study of the properties, behaviours and uses of materials, both natural and human made; the origins of human-made materials and how they are manipulated to suit a purpose.
Observing changes of different periods of time
Reporting and presenting findings from enquiries, including conclusions, casual relationships and explanations of and degree of trust in results, in oral and written forms such as displays and other presentations.
Grade 6 Sorting Materials in Groups.
