11.1.1: States of water

Year 7 & 8 TOC Water in nature States of water LO: Considering the water cycle in terms of changes of state of water As you have already learnt, substances can exist in different states: Solid, liquid and gas. Water is no exception.  Freezing When water freezes and becomes ice, the point at which it […]

Wow: Wastewater treatment plants

Year 7 & 8 TOC Wow science Wastewater plants In Australia we consume roughly 92 500 000 litre per day. Since we have a population of around 25 million, we need to make sure everyone has access to water.  Apart from Antarctica, Australia is the driest continent in the world. 35% of it receives so […]

5.2.4: Separating mixtures: Chromatography

Year 7 & 8 TOC Separating mixtures CHROMATOGRAPHY LO: Investigating and using a range of physical separation techniques such chromatography Something we discussed earlier in this chapter is solubility. Solubility is how easily a substance dissolves in a solvent. Knowing how well different substances in a mixtures dissolve in the solution is the basis for […]

5.2.3: Separating mixtures: Evaporation, distillation & CRYSTALLISATION

Year 7 & 8 TOC Separating mixtures EVAPORATION, DISTILLATION & CRYSTALLISATION LO: Investigating and using a range of physical separation techniques such as evaporation, distillation and crystallisation Think about salt water. Salt water is a mixture of salt dissolved into water. Using filtration, flotation or sedimentation won’t work to separate the two. So what can […]

5.2.2: Separating mixtures: Filtering and Centrifuging

Year 7 & 8 TOC Separating mixtures Filtration and centrifuging LO: Investigating and using a range of physical separation techniques such as filtration and centrifuging Sometimes waiting or trying to decant a mixture isn’t enough. You may need to separate the particles through different methods. Filtering and centrifuge are two good method for separating large […]

Wow: WW1 Gas masks

Year 7 & 8 TOC Wow science Gas masks in war World War 1, aka, the first world war was fought between the 28th July 1914 to the 11th November 1918.  During this time we saw an advancement in military technology and medical knowledge. Some of the notable inventions at this time were poison gas, […]

5.2.1: Separating mixtures

Year 7 & 8 TOC Separating mixtures Separation techniques LO: Investigating separation techniques such as flotation, decantation, sedimentation and magnetic seperation  Since mixtures are a combination of different types of substances there are different ways we can separate them back into their original substances. The technique we use to separate them depends properties of the […]

5.1.2: Solutions

Year 7 & 8 TOC pURE & MIXTURE Solutions LO: Identifying the solvent and solute in solutions You will hear this type of mixture a lot throughout your scientific carrier. A solution is a type of mixture which doesn’t separate by itself. The molecules are so tiny and spread so evenly through out, that the […]

5.1.1: Mixtures

Year 7 & 8 TOC Mixtures & Solutions Pure substances & Mixtures LO: Recognising the differences between pure substances and mixtures and identifying examples of each. Everything is made up of something. A piece of paper looks smooth, but if you look closer at it with a microscope, you’ll see it’s made up of thousands […]