18 & 19 Chemical Changes

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.

Rhubarb! Rhubarb! Rhubarb (Demo) - Stirring 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 sould 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 wite 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.

Print

Members - please log in to gain access to all resources. Visitors - please contact SSERC for membership & website access.