Hydrogen peroxide is also a dangerous, very potent by-product of metabolism, so it is essential that it is broken down quickly, otherwise it would cause damage to cells. Hypothesis I believe that as the concentration of the hydrogen peroxide (substrate) decreases, the rate of reaction will decrease consequently. This is because there will be fewer collisions between the substrate and enzyme molecules (catalase in yeast) – because there are fewer molecules of hydrogen peroxide, so there will be a decrease in enzyme-substrate complexes formed. The reaction will then stop because all of the active sites become saturated with substrate because the enzyme is the limiting factor. This will result in a decreased volume of oxygen being produced as one of the by-products of this reaction.
Garraud Sobner General Chemistry, Experiment II 02/11/2012 Questions: 1- In, part I which volume determination was more accurate? Explain. A- 2nd method with the graduated cylinder is more accurate. But not only because we found it more difficult to read the ruler. It was also because we had to take two measurements (one for diameter another for height)...which could possibly create more mistakes.
This is because the free electrons collide with the atoms as they pass through the wire. As the electrons collide with the atoms, they pass their energy on to the atoms causing them to vibrate more and faster. The faster the vibrations are the higher the temperature will be. 3) Material- Metal conductors have more resistance than insulators as the metals have free electrons which hit of the atoms causing them to vibrate more passing the energy on faster. I predict that as I increase the length of the wire, the resistance will also increase therefore the length is directionally proportional to the resistance.
In the lamp you have two liquids which are: * Very close in density * Insoluble in one another Oil and water are insoluble in one another (that's where the expression "oil and water don't mix" comes from), but oil and water have very different densities (a volume of water weighs a lot more than the same volume of oil). They won't work, so you search to find two liquids that are very close in density and are insoluble. This site can help you in that search. (Alka Seltzer will substitute for heat ) Now you apply heat to the bottom of the mixture. In a liquid motion lamp, the heat usually comes from a light bulb.
Zead Abu Abdou | Remarks | | Objectives * To give a simple demonstration of how temperature of a fixed amount of gas changes as its pressure changes. * To become familiar with boyle’s law apparatus. Introduction and Theory Pressure affects temperature, increasing pressure increases the temperature. This is because you're smashing the molecules/atoms closer together, so they bump into each other more often, so they are higher energy. Temperature is a measure of this average kinetic energy, so giving anything energy means increasing its temperature.
The hotter the metal, the more kinetic energy these vibrations have. This kinetic energy is transferred from hot parts of the metal to cooler parts by the free electrons. These move through the structure of the metal, colliding with ions as they
Also a larger concentration gradient produces a faster diffusion, and smaller molecules diffuse more rapidly than larger molecules. If you imagine a crystal of dye in a beaker of water, the crystal would be the solute because it is the dissolvable substance, and the water is the solvent because it’s what the solute dissolves into and there tends to be more of it, both of these form together to create a solution. If you look at the colour of the water just next to the crystal it would be
So, it makes sense that the speed of sound has the same order of magnitude as the average molecular speed between collisions. In a gas, it is particularly important to know the temperature. This is because at lower temperatures, molecules collide more often, giving the sound wave more chances to move around rapidly. At freezing (0º Celcius), sound travels through air at 331 meters per second (about 740 mph). But, at 20ºC, room temperature, sound travels at 343 meters per second (767 mph).Liquids:Sound travels faster in liquids than in gases because molecules are more tightly packed.
Lipid Oxidation Introduction: Oxidative rancidity is the major cause for the deterioration of fats and oils. When this occurs, oxygen is added to break the fatty acid chain in the triacylglycerol, and further produce peroxy radical for further oxidation of other fats. The oxidative reaction can be affected by the following factors: heat and light, catalysts (Metal) and enzymes (E.g. lipoxygenase). Although the peroxides formed are not the one which causes the rancid off flavors of oxidized fats, they are unstable once they are formed and will break down into secondary products like aldehydes and ketones whichcause the actual rancidity.
The water placed between the light and the chamber act as a cooling agent to prevent absorption of heat of the sample leaf. The water can absorb most of the heat from the light due to the high heat capacity. Therefore, we can avoid the effect of temperature on the photosynthesis. The halogen light is used in the experiment so as to provide more photon within a short period. Since that halogen light is more reactive and thus has a higher luminous efficiency.