Particle Model

Thursday 29 June Properties of matter SLO: State that solids, liquids and gases have different properties. Solids, liquids and gases ppt – what are they and why do you think that? ‘States of matter’ worksheet. Read pgs 78-79 in textbook – summary of key ideas/notes on properties of matter.

Monday 3 July Theories SLO: Describe what a theory is. Theories in everyday life/writing a definition of a theory. Read pgs 80-81 in text – discuss and answer questions. Definitions of: observation, theory, prediction, and examples.

What is a scientific theory? A hypothesis is an idea that hasn't been proven yet. If enough evidence accumulates to support a hypothesis, it moves to the next step — known as a theory — in the scientific method and becomes accepted as a valid explanation of a phenomenon. Theories may change, or the way that they are interpreted may change, but the facts themselves don’t change.

Evolution as an example We have ample evidence of traits in populations becoming more or less common over time (evolution), so evolution is a fact but the overarching theories about evolution, the way that we think all of the facts go together might change as new observations of evolution are made.

Observations and predictions Observations Observation consists of receiving knowledge of the outside world through our senses, or recording information using scientific tools and instruments. Any data recorded during an experiment can be called an observation. Predictions A prediction is a statement about the future. It's a guess, sometimes based on facts or evidence, but not always.

Thursday 6 July How scientists develop theories SLO: Explain how scientists develop theories. Quiz Properties worksheet and questions from textbook Properties summary

Monday 24 July Using ideas abut particles SLO: State that solids, liquids and gases have different properties. Complete ‘Summing up states’ – a recap on what we did last term. First do 1, then try 2. Homework: Using ideas about particles – cut and paste activity to link observations, theories and particle models. DUE Monday 31 July.

Monday 31 July Diffusion SLO: Explain diffusion using particle theory – Link dilution to particle movement. Smelly stuff! - demonstration Group work – try and explain what was happening to the particles in the demonstration. Report back to class. Fizzy drinks go flat –experiment. Graph weight loss over time. In between measurements – From textbook, read pgs 84-85 and create notes for key points (what are the main ideas). Write conclusion for experiment, linking results to particle theory.

Thursday 27 July Revision Miss Voss away. Work on Scipad sheets and learning keywords.

Monday 31 July Dilution SLO: Explain diffusion using particle theory – Link dilution to particle movement. Smelly stuff! - demonstration Group work – try and explain what was happening to the particles in the demonstration. Report back to class. Fizzy drinks go flat –experiment. Graph weight loss over time. In between measurements – From textbook, read pgs 84-85 and create notes for key points (what are the main ideas). Write conclusion for experiment, linking results to particle theory.

Thursday 3 August The speed of particles SLO: Explain diffusion using particle theory – recognise that diffusion goes faster when particles are moving faster. Cup of tea? Stirring? Sugar? 7Gd/1 Observing diffusion in liquids 1. 2 groups for each substance being tested. Groups report back findings, using particle pictures to illustrate how diffusion works.

What is Brownian motion? It is the random motion of particles suspended in a fluid (a liquid or a gas) resulting from their collision with the fast-moving atoms or molecules in the gas or liquid.

Friday 3 August The speed of particles SLO: Explain diffusion using particle theory – recognise that diffusion goes faster when particles are moving faster. Cup of tea? Stirring? Sugar? 7Gd/1 Observing diffusion in liquids 1. 2 groups for each substance being tested. Groups report back findings, using particle pictures to illustrate how diffusion works.

Monday 7 August Changes of state SLO: Describe some of the effects of particles when they are heated. Last lesson – our conclusion. Experiment: Investigating State Changes Copy title and aim into your books. Write your own prediction, carry out experiment and complete experiment sheet. Homework: Bring an Al can for next lesson (Friday).

Thursday 10 August The collapsing can SLO: Explain a change in gas pressure using particles. The collapsing can experiment – introduction, carrying out experiment in groups and completing the experiment sheet. Notes on pressure. Going over the NoS assignment for this topic. Homework: work on NoS assignment.

Monday 14 August Heated particles SLO: Describe some effects created by particles moving faster when heated (Give examples where increased particle movement leads to expansion of a material). Re-cap of last lesson – pressure. Worksheet – ‘Gas pressure 1’. Expansion and contraction – What happens to wooden doors and windows when heated/cooled? Demonstration – bimetal strip, ball and chain apparatus. Worksheet – Using expansion and contraction.

Thursday 17 August Expansion and contraction SLO: Describe some effects created by particles moving faster/slower when heated/cooled. Round robin of 5 experiments – complete each experiment in the time given, then answer the questions on your sheet for each experiment, before moving onto the next. Summing up our findings. NoS assignment.