ChemicalChangesLevel 3

SCN 3-18a

Having taken part in practical activities to compare the properties of acids and bases, I have demonstrated ways of measuring and adjusting pH and can describe the significance of pH in everyday life.

Colourful Flowers (demo) – Make paper ‘flowers’ soaked in different buffer solutions. Then spray indicator on and you get different colour flowers.

Indicators – microscale – a small scale investigation into indicators and pH.

Law of Similar Shapes (Demo) – Simple neutralisation reactions with phenolphthalein.

Rainbow Reaction (Demo) – Form a rainbow of colours to illustrate pH scale with hydrochloric acid and sodium carbonate along the length of a burette.

Spell Casting (Demo) – Clear liquid poured into beakers fails to change colour until the last one – phenolphthalein indicator – due to tiny amounts of acids/bases in beakers.

Vinegar Cheats (workshop) – Using a simple titration (with pipettes) to find out which samples of vinager have been watered down.

SCN 3-19a

Through experimentation, I can identify indicators of chemical reactions having occurred. I can describe ways of controlling the rate of reactions and can relate my findings to the world around me.

Bad Breath Indicator (Demo) – Using a buffer solution. Blow into one solution it changes colour but the buffer does not.

Beakers Not Conicals (Demo)– Series of redox reactions with Dichromate and thiosulphate etc – set up so that the reaction only works in a beaker.

Bleaching Blue Food Dye (workshop) – simplified version of a more advanced experiment looking at how blue food dye is decoloured bu household bleach.

Blue Bottle Reaction (demo) – Redox Reaction – on standing methylene blue solution turns clear, shaking turns it back to blue.

Blue Light (Demo) – Luminol reaction. A chemical experiment that produces light but not heat.

Cannon Fire (Demo) – Potassium permanganate catalyses breakdown of hydrogen peroxide mixed with Ethanol. Burning ethanol/hydrogen peroxide mixture is quiet but loud bangs appear on addition of permanganate.

Catalyst at Work (Demo) – Rochelle Salt and hydrogen peroxide, catalysed by cobalt chloride, shows different colour intermediate.

Coca Cola Powered Clock (Demo) – Different metals to generate electricity using coke as the electrolyte.

Colourless, Orange or Blue (Demo) – The oscillating Briggs-Rauscher reaction (as used in antioxidants).

A Cool Experiment (demo) – A very endothermic mixture of barium hydroxide and ammonium thiocyanate freezes a beaker to a wet plank/mat

Cut and Heal (Demo) – Using iron III chloride and potassium thiocyanate generate ‘Blood’ (iron thjiocyanate).

Dehydrated Snow (Demo) – A hydrogel novel materials, Sodium polyacrylate, absorbing water.

Different Drinks from the Magic Bottle (Demo) – One glass doped with barium chloride so when the sulphate solution is poured in you get a white precipitate.

Disappearing Water (Demo) – A hydrogel novel materials, Sodium polyacrylate, (from a nappy this time) absorbing water.

Dynamite Soap (Demo)– Exploding hydrogen/oxygen bubbles generated by electrolysis of water.

Electric Writing (Demo) – Electrical reduction to produce alkaline hydroxide ions which are shown up by indicator where you have ‘written’.

Electrolysis of lead bromide – microscale – a small scale version of the classic experiment that does not need to be carried out in a fume cupboard.

Electrolysis of Water (Demo) – Collection of hydrogen and oxygen from electrolysis of dilute sulphuric acid.

Electroplating Faces (demo) – Nickel plating of copper coin.

Elephant’s Toothpaste (Demo) – Foam produced by catalytic decomposition of hydrogen peroxide with detergent and food colouring.

Equilibrium and Le Chatelier (demo) – effect of temperature on equilibrium – a complex is coloured differently in hot and cold.

Fizz pops (workshop) – Using vitamin C tablets and bicarbonate of soda in 35mm film canisters to follow a reaction rate.

Fire Writing (demo) – Draw trail on filter paper with sodium nitrate and dry it. Then light end of trail and watch the fire smoulder along the path.

Flame Colours (Demo) – Using atomiser bottles for flame tests.

Foam Fire Extinguisher (Demo) – Making a foam ‘fire extinguisher’ with sodium bicarbonate, aluminium sulphate and detergent

Genie in a Bottle (Demo) – Exothermic catalytic decomposition of hydrogen peroxide by potassium iodide.

Gloopy and Gooey (Demo) – Gaviscon in copper sulphate solution and PVA/Borax cross-linking polymers.

Growing Silver Trees (Demo) – a displacement reaction with copper wite and silver nitrate that produces dentritic crystals of metallic silver.

Hot Stuff (Demo) – Exothermic spontaneous reaction of glycerol with potassium permanganate.

Invisible Writing (Demo) – Invisible ink made from Aspirin is revealed by an Iron sulphate spray.

Law of Similar Shapes (Demo) – Simple neutralisation reactions with phenolphthalein.

Lemons (workshop) – Investigating the effect of concentration and temperature on rate of reaction using lemon juice and potassium permanganate.

Light Sticks (Demo) – Effect of temperature on luminosity of glow-sticks.

Methane bags (Demo) – Burning bags with different ratios of methane:oxygen in.

Methane Bubbles (Demo) – Preparing and igniting bubbles of methane.

Methane Tin (Demo) – Using an  old coffee tin with a methane flame from hole in top. Air comes in and eventually you get the right ratio for an explosion to blow the lid off.

Non-Burning £5 Note (Demo) – Burn a note in ethanol/water mixture. The water keeps it cool enough not to burn.

Piezo Rockets (Demo) – Mini pipette rockets for hydrogen or other flammable gas.

Polymer Slime (workshop) – Making slime from borax and PVA glue – and looking at the properties as the composition varies.

Red, White and Blue (Demo) – A series of chemical reactions: ammonia with phenolphthalein, lead nitrate and copper sulphate.

Rhubarb Rhubarb (workshop) – (Similar to Lemons) Using rhubarb decolourising potassium permanganate to follow the rate of reaction, looking at concentration and surface area. Plus a fun demo version – stir a beaker of dilute potassium manganate VII with a stick of rhubarb, the solution goes clear.

Screaming Jelly Baby (Demo) – Molten potassium chlorate V causes rapid combustion of sugar in a jelly baby.

Silicon and Silanes from Sand (Demo) – Making silicon and silane from the reaction between magnesium and silicon dioxide (sand).

Silver Mirror (Demo) – Ammoniacal silver nitrate is prepared and this is reduced in a flask by a reducing sugar leading to a coating of silver on its inside.

Spell Casting (Demo) – Clear liquid poured into beakers fails to change colour until the last one – phenolphthalein indicator – due to tiny amounts of acids/bases in beakers.

Thionin (Demo) – A photochemical reduction. Thionin is a different colour in light and dark.

Traffic Lights (Demo) – A reversible redox reaction variant on the blue bottle reaction. Dye changes colour on shaking and reverts on standing.

Turning Copper Coins into Silver and Gold (Demo) – Zinc plating a copper coin with sodium zincate and then heating it to make brass.

Vinegar Cheats (workshop) – Using a simple titration (with pipettes) to find out which samples of vinager have been watered down.

Vitamin C Drops (workshop) – Determining the concentration of Vitamin C in a variety of fruit juices using a simple titration with iodine.

Vitamin C in Vegetables (workshop) – Activity to determine the concentration of Vitamin C in fruit and vegetables by titration against DCPIP.

Whoosh Bottle (Demo) – Ignition of alcohol vapour in a 15l water bottle to produce a spectacular ‘whoosh’.

SCN 3-19b

I have helped to design and carry out practical activities to develop my understanding of chemical reactions involving the Earth’s materials. I can explain how we apply knowledge of these reactions in practical ways.

Copper Etching (workshop) – Activity using the displacement reaction between copper sulphate solution and zinc plate to etch a design.

Fizz pops (workshop) – Using vitamin C tablets and bicarbonate of soda in 35mm film canisters to follow a reaction rate.

Lemons (workshop) – Investigating the effect of concentration and temperature on rate of reaction using lemon juice and potassium permanganate.

Vinegar Cheats (workshop) – Using a simple titration (with pipettes) to find out which samples of vinager have been watered down.

Level 4

SCN 4-18a

I can monitor the environment by collecting and analysing samples. I can interpret the results to inform others about levels of pollution and express a considered opinion on how science can help to protect our environment.

Water analysis A range of experiments analysing the content of water, including phosphates which should be suitable for this sort of environmental link.

SCN 4-19a

I can collect and analyse experimental data on chemical reactions that result in an obvious change in energy. I can apply my findings to explain the significance of the energy changes associated with chemical reactions.

Blue Light (Demo) – Luminol reaction. A chemical experiment that produces light but not heat.

Cannon Fire (Demo) – Potassium permanganate catalyses breakdown of hydrogen peroxid mixed with Ethanol. Burning ethanol/hydrogen peroxide mixture is quiet but loud bangs appear on addition of permanganate.

A Cool Experiment (Demo) – A very endothermic mixture of barium hydroxide and ammonium thiocyanate freezes a beaker to a wet plank/mat.

Dynamite Soap (Demo) – Exploding hydrogen/oxygen bubbles generated by electrolysis of water.

Elephant’s Toothpaste (Demo) – Foam produced by catalytic decomposition of hydrogen peroxide with detergent and food colouring.

Genie in a Bottle (Demo) – Exothermic catalytic decomposition of hydrogen peroxide by potassium iodide.

Hot Stuff (Demo) – Exothermic spontaneous reaction of glycerol with potassium permanganate.

Light Sticks (Demo) – Effect of temperature on luminosity of glow-sticks.

Methane bags (Demo) – Burning bags with different ratios of methane:oxygen in.

Methane Bubbles (Demo) – Preparing and igniting bubbles of methane.

Methane Tin (Demo) – Using an  old coffee tin with a methane flame from hole in top. Air comes in and eventually you get the right ratio for an explosion to blow the lid off.

Screaming Jelly Baby (Demo)– Molten potassium chlorate V causes rapid combustion of sugar in a jelly baby.

Whoosh Bottle (Demo) – Ignition of alcohol vapour in a 15l water bottle to produce a spectacular ‘whoosh’.

SCN 4-19b

Having carried out a range of experiments using different chemicals, I can place metals in an order of reactivity, and relate my findings to their everyday uses.

Growing Silver Trees (Demo) – a displacement reaction with copper wire and silver nitrate that produces dentritic crystals of metallic silver.

Electrode potentials – microscale – a microscale procedure for determining the electrode potentials of a range of metals and hence their relative reactivities.