Essay Database

the fermentation of glucose by bakers yeast. hypothesis If to separate tubes of 20% glucose solution with 1 mil of yeast is added to battery jars filled with 20 and 38 c water then the warmer one will cause the yeast to ferment at a quicker rate. …

and Name Name: Arsenic Symbol: As Number of Protons: 33 Number of Electrons: 33 Number of Neutrons: 42 Melting Point: 817.0 °C (1090.15 °K, 1502.6 °F) Boiling Point: 613.0 °C (886.15 °K, 1135.4 °F) History Arsenic: From the Latin…

heat of reaction of NaOH with HCl ApparatusMaterials: Polythene Cup, Thermometer, Measuring Cylinder, NaOH, HCl. Procedure: (1) 25cm" of HCl was placed in polythene cup, (2) HCl was left to stand for 5 minutes and then the temperature was…

The Global Impact Dichlorodiphenyltrichloroethane (DDT) was first synthesized in 1873, but it was not until 1939 that a Swiss chemist, Paul Hermann Muller, discovered that it could be sprayed on walls and would cause any insect to die within the…

England *Began teaching at the age of twelve *Was a teacher/chemist/physicist *Died in Manchester England July 27, 1844 Achievements *President of Philosophical Society *Winner of Gold Medal from the Royal Society *Cofounder of the British…

of silicon. Silicon cannot form strong ð bonds with oxygen by using its valency 3p orbitals. This is because of the large nuclear radius of the silicon atom and its orbitals which results in a less effective overlap with the smaller oxygen orbitals.…

have larger crops, with fewer diseases and pests to reduce crop yields. In developed countries pesticide sprayers have protection from pesticides through protective clothing, and government regulation of pesticides. We also have alternatives to pesticide…

secreted by venomous snakes when biting. It is produced in the glands, and injected by the fangs. Snake venom is used to immobilize and/or kill prey, and used secondarily in defence. It is a clear, viscous fluid of amber or straw colour. There…

soap and detergent. Soaps and detergents are not the same thing, although both are surfactants, or surface active agents, which basically means a washing compound that mixes with grease and water. Soaps are made of materials found in nature. Detergents…

band of molecule friends as we experience the phase changes of water into the very cup of lemonade you are holding right now. The first amazing phase change will transform us into a liquid. Right now my friends and I are tightly bonded together and…