Timstar

Prepared slide, angiospermae - dicot leaves, prunus lauro-cerasus TS leaf.

Prepared slide, angiospermae - monocot leaves, allium leaf epidermis 'E' with stomata.

Prepared slide, angiospermae - monocot leaves, zea mays (Maize) TS leaf.

Prepared slide, angiospermae - monocot leaves, ammophila TS xerophyte.

Prepared slide, angiospermae - anther and pollen development, lilium anthers TS mature pollen.

Prepared slide, coniferophyta (conifers) pinus 'E' stem showing xylem tubes.

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.

Economical clear acrylic burette, white graduations. TPX/Teflon stopcock.

Economical clear acrylic burette, white graduations. TPX/Teflon stopcock.

A clamp consisting of two plastic coated spring clips mounted 50 mm apart on stainless steel plate with rod. Dimensions 150 x 8 mm (L x Diameter).

Economical die cast metal burette holder with integral boss. Simple clamping action for use with one burette.

Economical die cast metal burette holder with integral boss. Simple clamping action for use with two burettes.

Strong burette holder with alloy cast jaws with plastic ends to clamp single burette. Suitable for burettes up to 100 mL.

Hardwood complete with base and rod. All parts are interchangeable. Burette clamps are cork lined.

A one piece clamp moulded from acetal homopolymer to hold a 50 mL burette. Suitable for 12 mm diameter retort rods only.

Polypropylene.

A pattern unit comprising high strength alloy casting with plastic jaws. Suitable for all burettes up to 100 mL capacity.

Glass stopcock Class A with blue graduations.

Complies with ISO 385. Graduations in white enamel for increased visibility with dark solutions. Grease-free interchangeable PTFE key with 1.5 mm bore. 0.1 mL graduations.

Hardwood complete with base and rod. All parts are interchangeable. Funnel holder is slotted.

To BS 846 Class B, permanent amber stain graduations.

This Class B burette is made from precision bore borosilicate glass for improved accuracy along the entire length. It has an interchangeable PTFE stopcock and a replaceable glass jet. This burette has blue graduations every 0.1 mL and has a tolerance of +/- 0.1 mL. Manufactured in accordance with BS EN ISO 385: 2005.

Spare 50 mL tube with 0.1 mL graduations. For BU03765.

Spare stopcock and jet. For BU03765.

Spare jet for BU03765.

Class B burette with PTFE stopcocks and white 0.1 mL graduations.

Class B burette with PTFE stopcocks and black 0.1 mL graduations.

Class B burette with glass stopcock and white 0.1 mL graduations.

Resistant to most chemicals and stable from 40 °C to 200 °C.

To BS 846. Class B with permanent blue graduation.

To BS 846 Class B. Blue graduations.

White enamel back, PTFE stopcock, blue graduations.

To BS 846 Class B. Amber graduations.

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.

A set of 4 Mystrica colorimeters supplied in a deep Gratnells tray with a lid and polyethylene foam insert. The Mystrica colorimeter delivers high quality performance in a small, robust, user-friendly and affordable package. It has 3 LED light sources emitting red (630nm), green (525nm) or blue (465nm) which are easily selected using the RGB button. You can choose to measure either absorbance or transmittance with the simple press of a button. Absorbance readings are shown from .000 to 1.999 and transmittance is shown from 100.0 to 0.1%. The power switches off after 2 minutes to conserve battery life, unless it is connected to a PC, tablet or phone. This colorimeter allows the use of 12 mm test tubes as well as standard 4.5 mL cuvettes, creating a more versatile unit. Features: • Wireless connection to iPads, iPhones and Android™ devices • Mystrica Colorimeter app available on the App Store and Google Play™ • Each colorimeter has unique identity. The app detects all units within range of an iPad or iPhone and allows one to be selected • Collect data as graphs and tables • Continuous data collection or separate readings • Best fit line for rate of reaction • Email results as .csv file for analysis and storage • Fully supported suggestions for practical activities. • Power: 4 x AA batteries (not included) or via USB when connected to computer Price includes 4 colorimeters, 40 plastic cuvettes with caps, 4 cuvette stands, 25 x 12 mm glass test tubes, 2 sets of instruction sheets, 2 user manuals and 4 USB links.

Rod and disc type. Borosilicate glass. 20 discs.

Non-jointed, borosilicate glass.

Non-jointed, borosilicate glass.

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.

Cobalt blue. Dimensions: 75 x 50 mm.

Fused into glass handle.

Specific gravity. Universal range 370 mm 0.01°SG.

Spare Lamp for ME10365.

Soda Glass. Outside diameter 1.8-2.0 mm. Wall thickness 0.28-0.32 mm. In packs of 100.

Chemical jigsaws offer highly effective method of teaching chemical formulae and equations. It uses number of interlocking pieces with plus signs and arrows that enable students to build representations of covalent and ionic compounds and also to model equations. Advantages: • More effective understanding of formulae • Enhanced motivation • Use of OHP for demonstrations. Covalent jigsaw:- In the covalent jigsaw, atoms are represented by coloured disks with cut-outs corresponding to the positions of atoms in the periodic table. Atoms are joined by clear bonds representing electrons shared between atoms. The covalent jigsaw is available in two boxed sets. Ionic jigsaw:- The ionic jigsaw pieces build on the popular method of using squares and rectangles to aid the determination of ion ratios when constructing formulae. The parts are translucent and can be placed on an OHP for projection. The formulae can be identified by shape, colour and identifying symbols/formulae can be written on them in felt-tip pen. Please Note: the KS3 kit is required prior to the KS4-upgrade kit.

Chemical jigsaws offer highly effective method of teaching chemical formulae and equations. It uses number of interlocking pieces with plus signs and arrows that enable students to build representations of covalent and ionic compounds and also to model equations. Advantages: • More effective understanding of formulae • Enhanced motivation • Use of OHP for demonstrations. Covalent jigsaw:- In the covalent jigsaw, atoms are represented by coloured disks with cut-outs corresponding to the positions of atoms in the periodic table. Atoms are joined by clear bonds representing electrons shared between atoms. The covalent jigsaw is available in two boxed sets. Ionic jigsaw:- The ionic jigsaw pieces build on the popular method of using squares and rectangles to aid the determination of ion ratios when constructing formulae. The parts are translucent and can be placed on an OHP for projection. The formulae can be identified by shape, colour and identifying symbols/formulae can be written on them in felt-tip pen. Please Note: the KS3 kit is required prior to the KS4-upgrade kit.

These 3D Molecular Designs Magnetic Water Kits© will help students to understand the structure and properties of water. They can ""see and touch"" water in its dimensions and embedded magnets enable students to ""feel"" hydrogen and oxygen atoms attract and repel each other. Features include: Magnets in oxygen atom, so students can make ice; Permanently embedded magnets (magnets won't fall out when atoms are unassembled); Removable hydrogen atoms, so students can assemble water and compare hydrogen bonds to covalent bonds; Non-polar ethane, so students can see and feel how non-polar molecules interact with polar molecules; Hydroxyl group, so students can make ethanol; CD with Lesson Plans. As students explore the 3D water kit they will be able to: See spontaneous bonding, Compare hydrogen bonds to covalent bonds, Make ice crystals, Dissolve salt, Evaporate water, Add non-polar ethane to water, Create ethanol, Explore capillary action. Each 3D Molecular Designs Water Kit© cup includes: 12 water molecules, sodium, chloride, ethane and hydroxyl group. All atoms are magnetised to reflect their positive or negative charges (except non-polar ethane). This 6-Cup Water Kit© also includes CD with Secondary school lesson plans.

This 3D Molecular Designs Magnetic Sodium Chloride Model will help students to understand the structure and properties of ionic compounds. Each ion has embedded magnets to simulate ionic bonding. The 3 x 3 x 3 Lattice contains 27 ions (13 of type of ion and 14 of the other.) Lattices do not include water molecules, which are available, if required, in the magnetic water molecule kits. The model will help students gain an understanding of: Ionic structure and bonding, The cubic nature of salt crystals, Efficient lattice packing, High melting temperature, and Brittleness Cleavage planes.

This 3D Molecular Designs Magnetic Sodium Chloride Model will help students to understand the structure and properties of ionic compounds. Each ion has embedded magnets to simulate ionic bonding. The 4 x 4 x 4 Lattice contains 64 ions (32 Sodium and 32 Chlorine). Lattices do not include water molecules, which are available, if required, in the magnetic water molecule kits. The models will help students gain an understanding of: Ionic structure and bonding, The cubic nature of salt crystals, Efficient lattice packing, High melting temperature, and Brittleness Cleavage planes.

The magnetic Molecule Demonstration kit, from Bright of Sweden, is the perfect demonstration tool to help demonstrate molecules and chemical bonding to students in an easy and concrete way. The kit comes with 90 magnetised 'atoms' in different colours white (representing e.g. Hydrogen), black (e.g. Carbon), red (e.g. Oxygen), blue (e.g. Nitrogen), green (e.g. Chlorine) and yellow atoms (e.g. Sulphur) with 20 each of the black, white and red atoms and 10 each of the blue, green and yellow, enabling wide range of molecules to be represented. It also contains 50 bindings (bonds) the model can be used with or without bonds. As all parts of the kit are magnetised, they can be used directly on magnetic whiteboard or blackboard. Contents: 20 each of white, black and red 'atoms' 10 each of green, blue and yellow 'atoms' 50 bindings (bonds) Special storage box .

Study the unique molecular structure of carbon nanotubes. Fullerene molecules are all visually interesting and can be well represented by molecular models. Their unique molecular structure results in numerous potential exciting applications in current day nanoscience which can engage pupils and help to create link between chemistry and the 'real world'. This 530 mm model uses atoms from the Minit system which can be arranged to show the chair, zigzag or chiral structures of the tube and the associated properties. Particular areas to study include: • The similarities in structure of carbon nanotubes and the layers in graphite. • How curvature is achieved in the molecular shape of the ends of nanotubes due to the difference in bonding angles. • Different symmetries of carbon rings in the carbon nanotube the chair, zigzag and chiral structures and how these differences affect properties such as strength and conductivity and hence potential applications. Kits contains 260 atoms. Please note this kit version requires assembly.

A basic introductory set designed to help students understand chemistry. Consisting of: Spheres: 12 Carbon, 7 Oxygen, 2 Nitrogen, 1 Sulphur, 6 Halogen and 20 Hydrogen. Links: 33 short grey, 12 long grey and 29 Hydrogen connectors. Packed in plastic box with instructions.

Designed to make models of most compounds in the G.C.S.E. and Advanced level courses. Consisting of: Spheres: 24 Carbon, 12 Oxygen, 4 Nitrogen, 2 Sulphur, 12 Halogen, 3 Metal, and 40 Hydrogen. Links: 60 short white, 55 medium grey, and 25 long grey. Packed in plastic box with instructions.

A versatile set suited to G.C.S.E. and Advanced level courses covering a comprehensive range of organic, inorganic molecules from simple ones to complex ions. Consisting of: Spheres: 6Carbon, 22 Oxygen, 10 Nitrogen,12 Sulphur, 8 Halogen, 14 Metal, 7 Phosphorous and 14 Hydrogen. Links: 50 medium grey and mauve, and 36 long grey. Packed in plastic box with instructions.

Consisting of: Spheres: 12 Carbon, 6 Oxygen, 2 Nitrogen, 2 Sulphur, 4 Halogen, 1 Metal, 1 Phosphorous, and 20 Hydrogen, and 2 Pyramidal Nitrogen. Links: 26 short white, 26 medium grey, and 12 long grey. Packed in plastic box with instructions.

Consisting of: Spheres: 6 Carbon, 7 Oxygen, 3 Nitrogen, 2 Sulphur, 6 Halogen, 11 Metal, 2 Phosphorous, and 14 Hydrogen. Links: 20 medium grey, 12 long grey and 5 medium purple. Packed in plastic box with instructions.