Chemistry

Introduce chromatographic separation to your class and show them how dyes of different colours separate on the basis of their size and shape. Columns may be rinsed and reused. Kit includes: instructions, sample mixture, chromatography columns, dry matrix, elution buffer, transfer pipettes, microtest tubes. All you need: 50 or 100 mL beakers, 25m mL beaker or test tube, ring stands with clamps, distilled water. For 10 Separations. Packing Column 20 min., Column Separation 40 min.

This experiment introduces chromatographic theory and methods of thin layer chromatography. A mixture of dyes are separated on cellulose-based TLC plate using two different solvent systems. Kit includes: instructions, samples, reagents and solvents, 10x20 cm cellulose thin layer plate (to be cut into eight 5x5 cm squares), 5 µL glass capillary pipets. All you need: 250 mL beakers, metric rulers, pipet pump, or 10 mL pipets, distilled water. For 8 Separations. Spotting Plates 20 min., TLC Separation 5 min.

Most molecules have net charge within pH range of 2 to 10. When the pH is altered, the net charge on molecules can change drastically. In this experiment, mixture of two chemicals is absorbed onto solid support ion-exchange column and separated during elution under conditions that influence their net charge. Kit includes: instructions, ion exchanger, chemical mixture, potassium acetate buffer, chromatography columns. • All you need: spectrophotometer cuvettes, ring stands and clamps, test tubes, lab glassware, distilled water, ml pipets and pumps. For 6 Separations. Requires 60-90 min.

These new atomic structure kits from Bright of Sweden are an award-winning, hands-on teaching aid for students. The unique models, based on Bohr's atomic model, allow students to make their own atoms, isotopes and ions and give them great hands-on experience of the structure of atoms. Each kit includes: Box with lid; electron shells on the lid and at the underside of the box; 30 protons; 30 neutrons; 30 electrons; smart storing of subatomic particles inside the box.

The complete package! This whole class set contains one Atomic structure Demonstration kit and eight Atomic Structure Student Kits, along with lesson plan/working sheet which has been developed together with science teachers; use it for studying activities, for tips and guidance or as tests for the students.

Student version spare particles, consisting of 30 protons, 30 electrons and 30 neutrons.

With 'Rotaflo' stopcock and porosity 'O' sintered disc. Stopcock bore 3 mm. Socket 19/26. Dimensions (L x Diameter): 300 x 20mm.

A mixture of cyan, magenta and yellow inks which appears black when combined but separates out into bright constituent colours when spotted on chromatography card and separated using solvent, (water) or by electrophoresis. Provides sufficient for approximately 500 ink spots.

An ink which uses isopropyl alcohol, instead of water, as solvent, so it dries by absorption instead of evaporation. When paper with Quink becomes wet, the ink will run into its separate components. The bottles have low centre of gravity to reduce the risk of tipping over. Supplied in 57 mL bottle.

Scarlet chromatography ink

Green chromatography ink

Blue/Black chromatography ink

Supplied as box of 100 sheets.

Supplied as box of 100 sheets.

Pattern 'CRL'. Eleven 3mm wide slots. Supplied as box of 100 sheets.

Supplied in reel, 100 m long.

Supplied in reel, 100 m long.

Supplied in reel, 100 m long.

Supplied in reel, 100 m long.

Supplied in reel, 100 m long.

Supplied in reel, 100 m long.

Supplied in reel, 100 m long.

Dimensions (W x D x H): 230 x 90 x 230 mm.

To fit CH04012.

Pair of rods.

Carbon rods, 100 x 5 mm. Pack of 10 rods.

Carbon rods, 200 x 8 mm. Pair of rods.

Platinum electrodes, with screw terminals. Manufactured in borosilicate glass. Length from tip of foil to tip of terminal, 114 mm.

These versatile electrode holders are suitable for holding Carbon rod electrodes as well as metal strip electrodes. They are designed to fit over 100 mL and 250 mL glass beakers, being held in place by small plastic lugs to prevent them slipping off. Resistant to corrosion, they accept 6 - 8 mm diameter cylindrical (e.g. carbon) electrodes and 19mm wide, 0.8 mm (minimum) thick metal strip electrodes. The brass connectors also resist corrosion and are compatible with the usual 4 mm stackable type lab leads. To tighten the carbon electrodes without crushing them, the setscrew is equipped with stop. • 4 mm sockets • Dimensions (L x W x H): 100 x 40 x 15 mm • Complete with 2 carbon electrodes

These 'S' shaped electrodes are convenient and easy to use simply hang them over the rim of the beaker containing the electrolyte and connect crocodile clips with 4 mm leads to them! Made from insulated brass, with a short length of carbon rod attached at the lower end and bare contact at the top for attaching crocodile clip. Supplied as a pair of electrodes.

These round electrodes will fit the electrode holder EL110620, the electrode connector EL150426, and rubber stoppers with hole. Diameter 6-7 mm.

These round electrodes will fit the electrode holder EL110620, the electrode connector EL150426, and rubber stoppers with hole. Diameter 6-7 mm.

These round electrodes will fit the electrode holder EL110620, the electrode connector EL150426, and rubber stoppers with hole. Diameter 6-7 mm.

These round electrodes will fit the electrode holder EL110620, the electrode connector EL150426, and rubber stoppers with hole. Diameter 6-7 mm.

These round electrodes will fit the electrode holder EL110620, the electrode connector EL150426, and rubber stoppers with hole. Diameter 6-7 mm.

These round electrodes will fit the electrode holder EL110620, the electrode connector EL150426, and rubber stoppers with hole. Diameter 6-7 mm.

These round electrodes will fit the electrode holder EL110620, the electrode connector EL150426, and rubber stoppers with hole. Diameter 6-7 mm.

Dimensions: 100 x 10 mm. Sold in packs of 10.

Each cell consists of 75 x 25 mm glass cylinder with 2 hole rubber stopper fitted with carbon electrodes. Electrical contact is made through the crocodile clips and a piece of insulating material between the electrodes prevents short circuiting. The gases evolved are collected in two 75 x 10 mm test tubes suspended over the electrodes by piece of wood and rubber bands (not supplied).

Spare glass tube for EL06891.

Spare carbon electrodes for EL06891.

This kit uses the juice within lemon as an electrolyte in an oxidation-reduction reaction to produce useful electricity sufficient to power clock. The electrodes must be sanded clean between each attempt. Requires lemons to make ""batteries"" in series to generate sufficient voltage to power the clock.

Consisting of an inverted U-tube with its ends closed by sintered discs. Dimensions (Diameter W x H): Arms 13 x 80 x 100 mm.

This set allows students to experiment with the characteristics of primary cells (voltaic cells). By using different electrodes and electrolytes, various voltaic cells can be made and tested. The set contains various different electrodes, including zinc, lead, aluminium, carbon, tin, copper, nickel and iron. Also included are a plastic cell container with electrode holders and porous pot. Instructions included. Dimensions: 100 x 20 mm (approx.).

Suitable for use with EL180875 and EL180877.

Comprises three parallel tubes, joined at the bottom with a horizontal tube. The central tube has a funnel for filling with water, and the side tubes have open ends at the bottom to allow bungs that hold electrodes to be fitted, and jets with stopcocks at the top for collecting gas in test tubes. The side tubes are graduated 0-50 x 0.2 mL so that the volume of gas in each can be measured. Clamps and support base (sold separately) are recommended so the unit can be mounted on retort rod.

Comprises three parallel tubes, joined at the bottom with a horizontal tube. The central tube has a funnel for filling with water, and the side tubes have open ends at the bottom to allow bungs that hold electrodes to be fitted, and jets with stopcocks at the top for collecting gas in test tubes. The side tubes are graduated 0-50 x 0.2 mL so that the volume of gas in each can be measured. Clamps and support base (sold separately) are recommended so the unit can be mounted on retort rod.

For student experiments. Embedded platinum electrodes are connected via 4 mm sockets. Two miniature test tubes are included for gas collection.

Shade welding filter lenses, as recommended for safe viewing of burning magnesium etc. Sold as pack of 10 filters.

Shade welding filter lenses, as recommended for safe viewing of burning magnesium etc. Sold as pack of 10 filters.