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Chemical Reactions

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Matt Crosbie

on 9 May 2011

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Transcript of Chemical Reactions

Chemical Reactions Chemical Change Physical Change Photosythesis Respiration Reactive Elements Signs of chemical change There are many signs of chemical change. An example of a sign of chemical change is Precipitate. Precipite is when a solid is formed because of a chemcial reaction. Here are some other signs of chemical change
change in color
tarnish Here is a formula of chemical change, Carbon plus Oxygen equals carbon dioxide. A chemical change is when the change of molecules, compounds or atoms change to make a new substance Reactants are the starting substances and the products are the new substance NaHCO3 or baking soda plus HC2H3O2 or vinegar equals to three products, first is carbon dioxide, second is H2O, last is sodium acetate. Sodium acetate is a crystalline salt that attracts moisture from the air. The most important chemical reaction is photsynthesis, this reaction helps us breathe This first starts when the sun rays, the light from the sun that makes it to earth goes through this process. When this energy hits the plants the reaction starts and the plant absorbs specific parts of the light. In the periodic table the two most reactive element group are
Alkali Metals and Halogens. Halogens are the most reactive nonmetal while the Alkali Metals are the most reactive metals. The next part includes chloroplast, this is a plastid or a thin covering of cells, this has chlorophyll molecules and the molecules go into an area called the Stroma. This is a matrix of cells. Chlorophyll is a green colored matter of plants. After this the plant breathe out oxygen and then it breaths in the carbon dioxide and it starts again. Respiration is the reverse of photosynthesis. The body cells in your body forces glucose and oxygen to mix their atoms up turning into carbon dioxide, also known as CO2, and water (H2O). It releases stored energy you can use to run, work, play, learn, and most importantly, live. Respiration is also an important chemical reaction. In fact, it is just as important as photosynthesis. People and animals cannot live without respiration. The formula to respiration is, glucose plus oxygen equals to the first product of carbon dioxide, water and energy. In the Alkali Metals there is Lithium, Sodium, Potassium, Cesium, Rubidium and Francium. Francium has the highest reactivity, because of the atomic number of 87. In alkali metals family the one that has the highest atomic number is the most reactive. Alkali Metals: Lithium (Li), Sodium (Na), Potassium (K), Rubidium (Rb), Cesium (C), and Francium (Fr). In the Halogens there is Fluorine, Chlorine, Bromine, Iodine and Astatine. In the Halogens the one with the least atomic number is the most reactive, that is Fluorine, because it has the atomic number of nine. An atomic number is the number of protons and neutrons in an atom. In the periodic table the Halogens are in the right. Halogens: Fluorine (F), Chlorine (Ch), Bromine (Br), Iodine (I), and Astatine (At). Physical change is the opposite of chemical change. They are different from each other because physical change is not changed by atoms. Not like chemical change the size and shape of an object is changed, not by chemicals, but by other objects.
A chemical change is when the molecules, compounds or atoms is change chemically to make a new substance Here are some example of physical change:
tearing a piece of paper
breaking glass
hammering nails into wood Here are some examples of physical properties:
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