4. The products of a burning candle are carbon dioxide and water. 5. wax(vapor) + oxygencarbon dioxide + water Reactants Products Conclusion: From this lab, I learned that wax burns in a vapor state. Fire requires fuel and oxygen in order to burn. The products of a combustion reaction are carbon dioxide and water.
It dehydrates sucrose (table sugar), C12H22O11, leaving a spongy black mass of carbon and diluted sulfuric acid. Concentrated sulfuric acid reacts similarly with skin, paper, and other animal and plant matter. When it is mixed with water, a highly exothermic reaction occurs, and the energy released can be enough to heat the mixture to boiling. Therefore, concentrated sulfuric acid has to be diluted by adding the acid slowly to cold water while the mixture is stirred to dissipate the heat. The first successful method for making sulfuric
CHEMICAL REACTIONS EXOTHERMIC REACTIONS: When one substance is brought together or mixed with another and the resulting interaction evolves or generates heat, the process is referred to as an exothermic reaction. An exothermic (exo- is a prefix meaning "out of") reaction is one where the energy flows out of the system into the environment. Combustion reactions are exothermic. Some exothermic reactions may require heating just to get started, and will then proceed on their own. Exothermic reactions pose special hazards whether occurring in the open environment or within a closed container.
Distillation is used to purify a compound by separating it from a non-volatile or less-volatile material. When different compounds in a mixture have different boiling points, they separate into individual components when the mixture is carefully distilled. The boiling point is the temperature at which the vapor pressure of the liquid phase of a compound equals the external pressure acting on the surface of the liquid. The external pressure is usually the atmospheric pressure. Different compounds boil at different temperatures because each has a different, characteristic vapor pressure: compounds with higher vapor pressures will boil at lower temperatures.
Energetics Aim: To measure the energy released from the complete combustion of a known mass of alcohol or paraffin wax, to heat water. Hypothesis: The combustion of alcohols is exothermic. In this experiment the energy is released from burning a known mass of alcohol in order to heat a known amount of water. A comparison of various alcohols and paraffin wax (methanol, ethanol, propanol, butanol, octanol and candle) as fuels can be made by calculating the quantity of energy transferred to the water. In this experiment, the amount of energy (heat) involved in a chemical change will be determined.
Chemical Agents Oxidizer, what is an oxidizer? The word "burning" describes the oxidation of a fuel in air. A campfire, for instance, uses oxygen from the air to turn wood (cellulose) into steam (H2O) and carbon dioxide (CO2), among other things. So why do fireworks need an oxidizer? Simply because our atmosphere doesn't provide the chemicals with enough oxygen (O2) to sustain the rapid rate of burning that fireworks require in order to give off color, shoot into the air, or explode.
The equation for the reaction is known as: Metal + cold water [pic]hydrogen(H2) + metal hydroxide (MeOH) The reaction is very exothermic and had the tendency to allow the hydrogen to ignite a fire. Sulfuric acid is a very strong dehydrogenation agent which allows it to be a danger to people. We had tested this on sugar instead of an actual human being. The chemical reaction is very exothermic and causes the intense dehydration of the sugar. The Sulfuric acid is a catalyst for the reaction.
(As you can guess, different fuels begin burning at different temperatures.) Heat or ignition sources lift fuel (combustible material) to its activation energy to start the fire. The fire generates heat which sustains the chemical reaction; the blaze continues and spreads. Some firefighting tactics shield the fuel from air (oxygen) to extinguish the blaze. Carbon dioxide fire extinguishers expel a cold fog of CO2 that cuts a fire off from its air supply.
The challenge in refrigeration (and air conditioning, etc.) is to remove heat from a low temperature source and dump it at a higher temperature sink. Compression refrigeration cycles in general take advantage of the idea that highly compressed fluids at one temperature will tend to get colder when they are allowed to expand. If the pressure change is high enough, then the compressed gas will be hotter than our source of cooling (outside air, for instance) and the expanded gas will be cooler than our desired cold temperature. In this case, we can use it to cool at a low temperature and reject the heat to a high temperature.
If flammable materials are released, fire or a secondary explosion may result. Hot liquors and toxic materials may contaminate the workplace or generate a toxic cloud that may spread off-site. There can be serious risk of injuries, even death, to plant operators, and the general