A certain red light has a wavelength of 725 nm and another red light has a frequency of 4.28 X 1014 /sec. Which would have higher energy per photon? (4.28 X 1014/sec; it is shorter) ______________8. Find the color of light whose frequency is 5.21 X 1014 cycles/sec.
Introduction In this lab I observed the burning of a candle very closely. I found out that the candle needs oxygen to burn, that it produces carbon dioxide similar to the way that my body produces carbon dioxide, and that a candle produces water as a second waste product. I learned that if I hold an object in the flame it becomes covered with soot which is unburned carbon fuel. Finally, I learned that neither the solid wax, nor the melted wax, nor the wick burns when a candle is lit. In fact, the wax itself is burning as a vapor or gas.
This energy is indestructible and is converted to light and heat. c. If you accidentally spill sodium chloride into a stove while cooking, it does not melt It is an ionic compound and the forces attract between the positive and negative ions, I ionic compounds they have a strong ionic bond and it takes a lot of energy to break. A high can only melt the table salt. 6) a. Which pairs will react from an ionic compound?
Artificial light sources can be put in three categories. The three categories are gas discharge, luminescent, and thermal. An example of gas discharge source is a neon lamp. A fluorescent tube is an example of luminescent source of light. Examples of thermal light sources are incandescent lamps and burning candles.
4. What is the color of the flame when the air vents (collar) are closed and no air is entering the burner? When the air vents (collar) are closed, preventing air from entering the burner, the flame appears to be a more violet color than the pale blue cone seen when air is mixed with the gas. 5. Describe the appearance of the flame when the air vents are opened.
The bond between the two oxygen atoms in peroxide is relatively weak; unstable peroxide decomposes producing nitrogen gas and 3-aminophthalate dianion. Electronically exited state of the dianion ultimately releases energy in the form of light by emitting a photon. Light emission resulted from the conversion of chemical energy into light energy due to changes in the composition of the chemiluminescent material. Thus, light production is related to the electronic state of the molecule. If an electron is promoted to an orbital of higher energy, it is no longer paired.
It stops convection currents formed at the top of the flask thereby stopping convection. It also stops heat transfer by evaporation as the particles evaporating from the liquid surface cannot escape into the atmosphere (In case it is not a plastic cap, you have to skip the first point mentioned about conduction) • The glass surface inside reduces conduction as glass is a poor conductor. • Vacuum present between the walls of the container stop conduction and convection, as both these type of heat transfer need particles or a medium • Silver surfaces are good reflectors of heat energy. So they reflect the heat back into the hot liquid. This reduces the energy transfer by radiation.
(c) Air is made up of a mixture of gases, and is comprised of only 21% oxygen. The remaining gases would not be involved in the combustion process. On the contrary, the gases such as carbon dioxide may hinder the combustion process. Hence, if the bomb calorimeter were to be pressurised with air at 30 atm, it would result in an incomplete combustion of the fuel sample due to the lesser quantities of oxygen available. There would be a slower rate of combustion which leads to inefficient burning and less heat would be produced in the process.
The panel that converts light energy into electrical energy is called a Photovoltaic panel. Light energy is not only used industrially and privately, but some of our vehicles run on part solar electric or entirely on solar electric. The light energy is collected through a panel on the vehicle, which is transferred to electrical energy that hits the motor; the motor then converts the electrical energy into mechanical energy, which turns the drive shaft that turns the wheels (kinetic energy). Not all energy transfer is perfect, there will always be a loss of energy in any system. The loss of energy will come from the electrons passing through any wires, released as heat energy.
The basis of gasification is to supply less oxidant than would be required for stoichiometric combustion of a solid fuel. Stoichiometric combustion occurs when all the carbon in the fuel is converted to CO2 and there is no excess O2 left over. Doherty, W. et al (2009) noted that the energy value of the useful gas is typically 75% of the chemical heating value of the original solid fuel and the syngas temperature will be substantially higher than the original solid fuel due to the gasification process. 2.8.5 Landfill gas (LFG) collection and utilization Landfills produce landfill gas by the degradation of organic matter under anaerobic conditions. The evaluation of any landfill gas recovery project is highly effected by the composition of waste, specifically the organic fraction, moisture level, and the “degradation” factor of different waste components.