The teacher provided the following chemical equation to describe the burning, or combustion, in the candle: Hydrocarbon fuel + O2 ( CO2 + H2O The candle we used was a small, white emergency candle about 3.5 cm tall. The candle had already been used by someone else because I could see from the black wick that it had been lit before. When we lit the candle I noticed that at first it was only the wick that was burning. Eventually, after the flame
bfly_recent.gifFrom the research, sunspots do not appear at random over the surface of the sun but are concentrated in two latitude bands on either side of the equator. The sunspots are greatly related to our climate. While the solar cycle has been nearly regular during the last 300 years, there was a period of 70 years during the 17th and 18th centuries when very few sunspots were seen (even though telescopes were widely used). This drop in sunspot number coincided with the timing of the little ice age in Europe, implying a Sun- to-climate connection. limb_flare_sm.jpg (5710 bytes)Solar flares are tremendous explosions on the surface of the Sun.
Another example of innovation is disruptive innovation with the creation of the first electric light bulb. This invention explored a new technology by using a tiny metal filament enclosed within a glass envelope, and offered greater convenience and adaptability than previous forms of lighting. Carbon arc lighting evolved for public street lamps, an incremental innovation, utilizing proven technology from Davy's discovery, which helped spread the use of lighting. Another big step for lighting innovation was the patenting of incandescent filament light bulbs, by legitimizing and standardizing the
2-propanol (bp=82 degrees C) 3. tetrahydofuran (bp=65 degrees C) 4. 1-butanol (bp=118 degrees C) 5. butanone (bp=80 degrees C) Give a better separation for the mixture to be distilled tetrahydofuran (bp=65 degrees C) because it is farthest from 100 degrees C Which alkyl halide would react fastest in a nucleophilic substitution using silver nitrate in ethanol (weak nucleophile, protic solvent)? 3-bromo-3-methylpentane (most
* Electric cigarettes work by heating specially formulated liquids to points where nicotine is changed into vapor. Combustion activates every compound and vaporizers stimulate just a handful. Electric cigarettes are special vaporization machines that can be set to the temperatures needed to transform nicotine. * Many of these machines are manufactured to operate with special solutions that consist of nicotine and additional chemical agents. This provides smokers with an experience much like that of using a regular cigarette but with fewer of the many harmful chemicals.
Lab 4 – Energy Sources and Alternative Energy Experiment 1: The Effects of Coal Mining Table 1: pH of Water Samples | Water Sample | Initial pH | Final pH (24-48 hours) | Pyrite | 4.5 | 5 | Activated Carbon | 4.5 | 6.5 | Water | 4.5 | 4.5 | POST LAB QUESTIONS 1. Develop hypotheses predicting the effect of pyrite and coal on the acidity of water? a. Pyrite hypothesis = Adding pyrite to water it will cause the pH levels to increase. b. Coal hypothesis = If I add activated carbon to the water it will lower the pH level of the water.
The static magnetic field exerts a magnetic force that can dislodge the pacemaker leads. On a brighter note the more modern up to date pacemakers are smaller and have less moving parts. They have leads that are less susceptible to the magnetic force and have a lower risk factor of being moved. (Ahmed, et al., 2013) The radiofrequency field effects the pacemaker differently than the static magnetic field. It can actually heat the lead used in the older models.
Scientists are investigating a different kind swtor gold of memory that gets even smaller. It relies on phase change materials (PCMs), which are heat sensitive. Instead of ones and zeros being stored in the electrons, they're stored by changing the material resistance, which moves from low to high as the temperature rises. Dear swtor credits , Star Wars: The Old Republic – Knights of the Fallen Empire – is coming October 27.swtor2credits will provide more promotion to celebrate this important
As stated by the results above, different fuels produced different amount of energy. According to the data, out of the four different fuels, Cheetos, Wax Candle, Ethanol and Cashew nut, Wax candle produced the most energy (J/g). During the process of the combustion of cashew, there is an error. The flame that is burning the cashew during the second trial is bigger than the other trials, taking less time in burning fuels, causing the results to be inaccurate. If I were to do this experiment again, I would change the number of trials to increase the accuracy of the results.
Many resources that America has now were discovered/made useful during the industrial revolution. Long before Americas set foot on what is now present day America; Native Americans used crude oil for medicine and fuel. In the 1840’s Americans started to make kerosene out of these crude oils to light lamps. The man accredited with finding out how to make crude oil and