1. Draft Substances and particles: hierarchy of knowledge Particle model
How is an expert’s understanding of the subject organised?
Big idea Structure determines properties
The properties of a substance depend upon the type of atoms it contains and the strength of the bonds holding them together. The properties determine the uses the substance is suitable for.
Unit concept
Particle model
Unit concept
Mixtures
Unit concept
Solubility
Sub-concepts
Solid, liquid, gas
Sub-concepts
Filtration, evaporation, distillation, chromatography
Sub-concepts
Dissolving
Facts
Definitions of terms: soluble, insoluble, solvent, solute, solution
What scientific reasoning, maths, literacy and problem solving skills are developed?
Skill area
Develop hypotheses
Suggest a hypothesis and a way of testing it
Skill area
Draw conclusions
Interpret information presented in a visual
Draft
Skill area
Use maths
Use quantitative reasoning and read values from a line graph
Note: the content is in draft form and may change when published © Mastery Science, 2018

2. I can use my knowledge to
Substances and particles: learning stages & objectives
Analytical chemist
Activate
I understand earlier concepts
Acquire
I can make sense of the idea that ..
Apply
In unfamiliar situations, I can use the concept to ..
Analyse
I can use higher order thinking to ..
Particle model
States
Substances can be modelled as small particles in motion. Their energy and arrangement differs between states of matter
Suggest a hypothesis to explain observations about changes in state
Work out the state of substances from melting and boiling point information
Test hypotheses about unfamiliar physical processes, in terms of particle energy
Mixtures
Material properties
Mixtures can be separated due to differences in the physical properties of the individual substances
Identify features of substances and suitable separating techniques
Identify evidence from a chromatogram and explain what it shows
Develop a combination of methods to separate a complex mixture and justify the choices
Solutions
Material properties
Solubility is how much of a substance dissolves in a fixed volume of solvent and depends on temperature
Calculate the mass of solute that will dissolve in a given volume of solvent
Estimate solubility from graphical data
Interpret solubility data to design an experiment to identify a range of unknown substances
Act
I can use my knowledge to
Use chromatography to solve a mystery
Note: the content is in draft form and may change when published © Mastery Science, 2018

3. (AQA Trilogy combined science)
Substances and particles: national curriculum
Which parts of KS3 are covered?
AQA KS3 syllabus: Particle model
3.5.2 Separating mixtures
Which parts of GCSE are covered?
(AQA Trilogy combined science)
Particle model
The three states of matter
Mixtures
Mixtures
Chromatography
Develop hypotheses
WS 2.1 Use scientific theories and explanations to develop hypotheses
WS 3.6 Present reasoned explanations including relating data to hypotheses
Draw conclusions
WS 3.5 Draw conclusions from given observations.
What practical skills can be developed?
Apparatus and techniques
AT.4.C
Required practical activity 12: investigate how paper chromatography can be used to separate and
tell the difference between coloured substances
What resources are there to teach this unit?
Below are some ideas. Visit to see more teaching & assessment resources, including:
Advanced planners with teaching ideas for Acquire
Mastery Practice Books to practise Apply
Diagnostic and summative assessments for Acquire, Apply and Analyse
Teaching
ideas
Act Students are given the Rf value of a food colouring that has been banned. They then carry out chromatography on different sweets to find out if any contains the banned colouring
Note: the content is in draft form and may change when published © Mastery Science, 2018