Chemical changes are taking place in almost everything that is going on. Chemical properties are determined by the reaction of a substance with other substances. Chemical changes are found in cheese making and at other jobs. When chemical changes take place some of the chemicals that were there may evaporate or turn into different chemicals. Some examples of chemical changes are combinations with acids and bases, reactions with oxygen and other active gases, and the reactions of the substance with other compounds. The chemical change of acids and bases are used when you are trying to remove warts. When your trying to kill someone with lethal gases you are using the oxygen and other active gases chemical change. The chemical change of substance and other compounds is used when your making the delightful treat of pudding. Chemical reactions are found in other ways but these are the most common occurrences. .
Chemical change results in the production of new substances. Two types of substances which are very important in everyday life are acids and bases. Acids are sour, water-soluble substances which are very useful in industry, household cleaning agents, and are used in cooking. Some examples are vinegar, soda,and lemon juice. Acids which are not combined with water are dangerous - they change so fast that they can react with skin and cause burns. Bases are bitter, water-soluble substances which are also very useful. Examples of bases are ammonia, baking soda, and drain cleaner. Bases are also used in some batteries. The solutions they form with water are called basic solutions. Bases are also highly active and must be treated with extreme caution, as they also can burn your skin. You have probably heard of antacids. These substances are bases which are safe to ingest and won't react with stomach acid in a deadly way. A chemical change in which an acid reacts with a base is called neutralization.
Chemical reactions are the heart of chemistry. ... These are reactions that involve a change in oxidation number. ... Even a slight change in any one of these could change the reaction. ... Photochemists will experiment with chemical reactions. ... Scientists today are still toying with chemical reactio...
Outline: Chapter 12 Gaseous Chemical Equilibrium I. Introduction A. Equilibrium between liquid and gaseous water: H2O(l) «H2O(g) 1. Chemical reactions involving gases are carried out in closed containers resemble in many ways the H2O(l) «H2O(g) system. 2. The reactions are reversi...
Many physical and chemical changes that we encounter are reversible. ... A chemical is a substance obtained by a chemical process or used for producing a chemical effect. ... Chemical equilibrium is a state of balance in which two opposing reversible reactions no further change in composition with time can be detected, provided the temperature and pressure are not altered. ... This means changing the equilibrium concentrations to a new set of values without changing the Keq value. ... The factors that affect a chemical reaction at equilibrium are changes in: 1.) ...
" This statement once said by a retired chemical engineer by the name of Henry Sullivan sums up what chemical engineers do. In Fact, without chemical engineers we wouldn't have safe air to breathe. ... They also hold meetings to plan out what changes you want to occur, get everyone's approval, write out proposals and budgets, work with vendors and contractors, submit project request, conduct research to develop new and improved manufacturing processes and, actively develop new materials for NASA. ... (American Chemical Society). ... For example, chemical burns, chemical allerg...
The Chemical and Physical Properties of Water Water consists of two volumes of hydrogen to one volume of oxygen. ... This is very important because all chemical reactions in cells take place in aqueous solution. ... Water has a high specific heat, meaning that it takes large amounts of energy to cause a change in temperature. ... A constant body temperature is crucial because rates of chemical reactions are greatly affected by temperature. ... Without this property, living organisms would overheat or freeze to death with the slightest change in temperature. ...
In this lab we were asked to do multiple chemical reactions and observe what was occurring before and during the reaction. ... After heating the substance for 3 minutes we noted that it had changed to a clack powder. ... The liquid did not change, and remained a blue color, but the silverfish color of the zinc had turned black instantly. ... We then observed the odor given off, which was a Strong, sour smell; there was no physical change. There is a vast amount of errors that could have occurred in this lab, especially with the amount of chemicals that had to be mixed, one very unlikely error ...
Bleach, like any other chemical, can affect the duration of the dye on the shirt. ... Today thermochromic chemicals include the Leuco Dyes and Liquid Crystals. ... The Leuco Dyes mentioned earlier require chemicals working together. ... Reversible photochromics change their chemical structure when sunlight is absorbed. ... Manufacturers and chemists are still researching ways to improve their life spans as well as exposure to different chemicals and temperatures. ...
