Essay Database

matter is made of. The ancient Greeks believed there to be only four elements- air, earth, fire, and water. We now know that elements are the simplest type of a pure substance. Because of the many different properties of elements, they have been organize…

In dilute concentrations acids are responsible for the sour taste of lemons, limes, vinegar and other substances. Hydrochloric acid is produced in your stomach to help digest food. Sulfuric acid is found in car batteries. Acids can conduct an electric…

with far reaching consequences is nuclear fission. Nuclear fission is defined as the splitting of heavy nuclei to release energy. This aspect holds many opportunities and possibilities for our technologically advancing world. Fission Process (Theory) …

factors which affect the rate of a reaction, according to the collision theory of reacting particles: temperature, concentration (of solution), pressure (in gases), surface are (of solid reactants), and catalysts. I have chosen to investigate the…

Specific Purpose: To persuade my audience that the "ozone hole" is not caused by man and therefore requires no policy against CFC's. Central idea: The ozone layer/"hole" is caused by fluct. in the environment and CFC's are little if any of the…

freshwater and sea water. It is unique in numerous ways and is a life giving ecosystem. To understand what brackish water is, a background should be known about its sources.                  First of all, there is freshwater. Out of…

must collide. They must also collide with enough energy for a reaction to take place. The energy created is called activation energy. The more often and faster the chemicals collide, the stronger the reaction. Rate of Reaction The rate of a reactio…

few of the colours seen in many different fireworks around the world. You may wonder how these wonderful explosions might happen and what chemicals were used to have a colourful blast off. Here are six different steps on how you make a firework. …

always benefit humanity, where others believe this new technology heralds a new era of advancement in medicine if people will release their fears and let the benefits begin. Cloning is a major breakthrough in science, which could possibly benefit…

substances using smallest number of tests. Materials: goggles 7 test tubes test tube rack test tube holder conductivity apparatus DI water stir rods scapulas well plate Bunsen burner dilute HCl Beaker plastic wash bottle marking…