Page 214 - Demo

Apparatus and Supplies
Tesla Coils, continued
Tesla Coil, Tabletop
Use this hands-free Tesla coil to demonstrate the unusual properties of high-frequency electrical phenomena. Teach many important topics such as transformers, electromagnetism, resonating electrical circuits, electric inductance, capacitance, and electrical power transmission with this 50,000-watt Tesla coil. The set includes two antenna plates, small neon lightbulb, mini discharge electrode, and lamp socket. Detailed instructions containing background information and 18 experiments are also provided.
Test Papers
Assorted Test Papers
Supplied in closed containers of 100 strips.
1-800-452-1261
flinnsci.com
212
Tesla Coil, Tabletop AP6479
Catalog No.
Description
Price/Each
AP6479
Tesla Coil, Tabletop
$334.75
Re-blue Blue Litmus Paper
Blue litmus paper can turn red over time due to absorption of carbon dioxide in the air. To re-blue your blue litmus paper, place a spatula-tip full (approximately 1 g) of powdered ammonium carbonate [(NH4)2CO3] in the vial with the blue litmus paper.
Catalog No.
Description
Use
Price
Per Vial
12 Vials
AP7901
Cobalt Chloride
Paper indicates relative humidity by color change: pink indicates high humidity; blue indicates low humidity.
$2.05
$23.28
AP7912
Congo Red
For strong acids. pH 3.0 (blue-violet) to 5.0 (red)
1.75
19.80
AP7893
Lead Acetate
Used to test for hydrogen sulfide (H2S) vapors. Paper must be moistened with water prior to use.
1.80
20.64
AP7923
Litmus, Blue
Used to test for acids. pH 4.3 (red) to 6.8 (blue-violet)
1.30
14.28
AP7934
Litmus, Neutral
Used to test for acid or alkali.
1.30
14.28
AP7945
Litmus, Red
Used to test for alkali.
6.8 (blue-violet) to 8.1 (blue)
1.25
13.68
AP7967
Methyl Violet
pH 0.2 (yellow) to 2.0 (blue-violet)
1.90
21.72
AP7978
Phenolphthalein
Very sensitive to ammonia vapors. pH 8.2 (colorless) to 10.0 (pink)
1.80
20.40
AP7989
PTC* (phenylthiocar- bamide)
Used to test for the genetic ability to experience a bitter taste from PTC. Occurs in 70% of the population.
2.30
26.28
AP7890
Potassium Iodide, Starch
Used to test for peroxides and other oxidizing agents. Color varies from white through blue to black.
2.05
23.28
AP7891
Sodium Benzoate Taste Test
Used to test for genetic ability to taste sodium benzoate. This may taste sweet, bitter, salty, or be tasteless, depending on genetic characteristics.
2.00
22.80
AP7892
Thiourea Taste Test
Used to test for the genetic ability to experience a bitter taste from thiourea. Some individuals can taste either PTC or thiourea, but not both.
2.00
22.80
AP7990
Control Taste Paper
Used as an untreated control for taste tests with PTC, sodium benzoate, and thiourea.
1.25
14.04
Test Papers, Strips in Vials AP7901, etc.
PTC Paper*
PTC paper is paper soaked with phenylthiocarbamide (PTC). The LD50 for PTC is 3 mg/kg. Such a low LD50 suggests that this is a very toxic substance. The solution to make the taste test paper contains approximately 50 mg of PTC per liter of water. We calculate that each strip of PTC paper would contain approximately 0.03 mg of PTC. We estimate that a person weighing about 50 kg (110 pounds) would have to lick and ingest 5,000 2" x 1⁄4" strips of PTC paper to reach the LD50. A few sensitized individuals may have an allergic reaction to PTC.
Acid Rain Survey Kit
This kit contains everything you need to collect and monitor the pH of rainwater or potentially acidic freshwater sources. Each kit includes enough materials for an entire class—15 sample tubes with caps, 5 color comparison charts and enough test paper (pH 3.0–6.0) for 75 determina- tions. Also included is a vial of 100 of Hydrion 0–12 pH test paper for testing and comparing the pH values of other liquids. All components are completely portable for use in the field.
Acid Rain Survey Kit AP7054
Catalog No.
Description
Price/Each
AP7054
Acid Rain Survey Kit
$26.70
TEST PAPERS continued on next page.