Use various shapes to calculate density and mass. Find out how each is different and reinforce metric measuring. This kit effectively introduces students to important properties of matter. Includes: • 1 aluminum bar • 2 aluminum cubes • 1 ruler
Platinum Electrode, Pair (for the Hoffman Electrolysis)
These flat electrodes were designed as replacement parts for the Hoffman Electrolysis Apparatus. The platinum lead wires are sealed in glass tubes and the glass tubes are inserted in No.1 rubber stoppers. These electrodes will fit Items #3155-01 and #3155-02. • Sold as a set of 2
Replacement Glass Only (for the Hoffman Electrolysis)
Spare glass replacement part only for use with Hoffman Electrolysis Apparatus. The graduated “U” tube with stopcocks and the glass thistle tubes are included. These are the same parts used in the complete apparatus (Item #3155-01). • Graduated 50 ml in 0.2 ml increments
Metal Support Stand Only (for the Hoffman Electrolysis)
Metal support stand only for the Hoffman Electrolysis (Item #3155-01) and similar apparatuses. This specially designed, heavy metal support has binding posts in the base and double clamps on the rod; a special clamp with prongs for supporting the lower part of the apparatus is also supplied. The stand will hold the apparatus securely without causing strains in the glass parts.
Use this device to demonstrate the phenomenon of thermal convection in liquids caused by temperature variation. It consists of a rectangular-shaped borosilicate glass tube, 6″ (150 mm) W x 8.25″ (150 mm) H, with a funnel-shaped opening at the top for filling liquids. When this tube is partially filled with water and heated at 1 corner after adding a dye, potassium permanganate crystals, saw dust, or aluminum powder, the movement of colors or particles illustrates the formation of convection currents. • Comes with a Teacher’s Guide and reproducible Student Handout
This hand warmer contains a super saturated solution of water and sodium acetate. Snapping the metal disc creates a chain reaction, causing the solution to crystallize. The crystallization process gives off heat. The heat packs can be recharged back to the liquid state by being boiled in water for 10-15 minutes and allowed to slowly cool. • Comes with a Teacher’s Guide • 4″ (100 mm) L x 4″ (100 mm) W
This apparatus consists of 2 brass rods with insulated handles. One of the rods has a ring and the other has a ball of approximate diameter 1″ (25 mm), attached at the end. The brass ball passes through the ring when both are at room temperature, but when the ball is heated it expands and cannot pass through the ring, demonstrating the expansion and contraction of metals. • Comes with a Teacher’s Guide
Use the conductometer for demonstrating the different heat conductivity of five metals by observing the melting of wax. It consists of five rods, 3″ (75 mm) L x 0.19″ (5 mm) Dia., of aluminum, brass, iron, copper, and stainless steel, which are radially fitted on a brass disk of about 1″ (27 mm) Dia. It offers an interesting and educational demonstration. • Comes with a Teacher’s Guide
This hand warmer contains a super saturated solution of water and sodium acetate. Snapping the metal disc creates a chain reaction, causing the solution to crystallize. The crystallization process gives off heat. The heat packs can be recharged back to the liquid state by being boiled in water for 10-15 minutes and allowed to slowly cool. • Comes with a Teacher’s Guide • 8″ (200 mm) L x 8″ (200 mm) W
Use this bar to demonstrate unequal expansion in different metals on heating. It consists of a laminated strip of 2 different metals fitted in a plastic handle. Due to differences in the coefficients of linear expansion of both metals, the laminated strip bends dramatically on heating. • Comes with a Teacher’s Guide • Strip is approx. 8″ (200 mm) L x 0.38″ (10 mm) W
Use this set to demonstrate that capillary rise is dependent upon the inner diameter of a tube. It proves that the molecules of a liquid are more attracted to glass than to other liquid molecules. The set consists of 4 glass capillary tubes of different inner diameters with a large tube serving as reservoir. It is mounted on a stand. • Comes with a Teacher’s Guide • Tubes approx. 6″ (150 mm) H
This set includes 1 cube each of aluminum, brass, copper, iron, lead, and zinc without hook. The cubes are ideal for showing students properties of metals. They can be used to easily illustrate the concept of density. • Comes with a Teacher’s Guide • Packed in a cardboard box • Cube side 0.75″ (20 mm)
Use this ball to demonstrate the effect of temperature on the density of a liquid. It consists of a copper ball about 2.25″ (57 mm) Dia., properly loaded so that its density is less than that of water, so it floats. When the water is heated, its density reduces and the ball sinks.