At even "low" hypersonic speeds (Mach 5-10), air molecules ionize into electrified and chemically reactive plasma, producing exothermic (heat-releasing) reactions that add to already monstrous frictional heat [sources: Fletcher; NASA]. To make it from New York to Los Angeles in 12 minutes ...
How do you balance synthesis reactions? What determines the amount of products in a chemical reaction? Identify what occurs in the reaction shown below. How can you tell if a reaction is exothermic? How do you collect gas from a chemical reaction? A chemical reaction has two elements as reac...
Fire is hot because thermal energy (heat) is released when chemical bonds are broken and formed during acombustionreaction. Combustion turns fuel and oxygen into carbon dioxide and water.Energy isrequired to start the reaction, breaking bonds in the fuel and between oxygenatoms, but much more en...
What is always true of a combustion reaction? How can a balanced chemical equation be used to determine the volume of a gas that will be produced from the reaction? What is a combustion reaction? Are combustion reactions exothermic? How do reactants and products participate in a chemical reac...
The rate of reaction is simply how fast the reaction occurs. Some reactions, like explosions, are very fast. Other reactions, like the rusting of iron, are much slower. Several things can affect the rate of the reaction including the temperature, pressure, or presence of a cataly...
A laser beam is generated by using a high-intensity light source or electrical discharge device to excite atoms or molecules inside a lensing medium. This lensing medium produces cascading excitations, which result in the production of photons. The photons are then resonated and partially released....
I asked them to put their own voice over it. It was the most awesome moment of revelation that when you ask kids to use their own voice and ask them to___, what they’re willing to share. The last question of the assignment is: how do you plan to use your life to positively imp...
One of the most promising development for stand-alone integrated systems for DNA analysis perhaps was an elegant combination of an exothermic reaction with phase change materials to regulate the heat for thermal cycling [126]. In this prototype, downstream processes such as purification and concentrati...
Endothermic absorption of energy is the opposite of exothermic reactions, where energy is released from a substance or system into its surroundings. In endothermic reactions, the products have higher energy than the reactants, while in exothermic reactions, the products have lower energy th...
The key difference between combustion and pyrolysis is thatthe combustion occurs in the presence of oxygen whereas the pyrolysis occurs in the absence (or near absence) of oxygen. Both combustion and pyrolysis are thermochemical reactions. Combustion is exothermic because it produces heat and light en...