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| 22 Jan 2013 10:43 AM |
science is boringg siggyflip |
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TKLuke
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| Joined: 25 Jul 2012 |
| Total Posts: 5957 |
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| 22 Jan 2013 10:44 AM |
but but but
~Teh Luigi Of RT~ |
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| 22 Jan 2013 10:44 AM |
im learning about cells like srsly how is this helping me in life
░▒▓Ծ‿Ծ ʜᴇʏʏʏ▓▒░ |
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MANTIS21
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| Joined: 12 Jan 2009 |
| Total Posts: 7123 |
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Crumpled
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| Joined: 31 Jan 2012 |
| Total Posts: 20497 |
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| 22 Jan 2013 10:45 AM |
@TSC same
~ Life Is Like A Crumpled Piece of Paper, I don't know why, it just is. |
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| 22 Jan 2013 10:45 AM |
they're like
Have you noticed that chemical reactions take different amounts of time? When you strike a match it seems to burst into flames instantly. However, wet concrete takes hours to harden before you can walk on it. A rate is how fast something happens. It can also be thought of as how much happens in a given time. You can find the rate of a chemical reaction. Simply measure how quickly the reactants change into products. The rate of a reaction depends on the chemical nature of the reactants and the products. Other things that may have an affect on the rate of a chemical reaction are temperature, the concentration of the reactants, the surface area of the reactants, or the presence of other chemicals.
and im like tl'dr
siggyflip |
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| 22 Jan 2013 10:45 AM |
| i have done chemical reactions, diseases, cells and stuff |
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| 22 Jan 2013 10:46 AM |
| I has science exam 2mrw QQ |
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| 22 Jan 2013 10:46 AM |
Chemical reactions take place when the molecules of the reactants collide. Click the arrow to see a chemical reaction. Here, one molecule of calcium oxide (CaO) collides with one molecule of carbon dioxide (CO2). The reaction yields one molecule of calcium carbonate (CaCO3), or chalk. For a chemical reaction to occur, the molecules of the reactants must be in just the right position. This allows the rearrangement of the bonds between atoms and the formation of new bonds. The rate at which this happens depends on a number of factors. siggyflip |
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MANTIS21
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| Joined: 12 Jan 2009 |
| Total Posts: 7123 |
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| 22 Jan 2013 10:47 AM |
just watch breaking bad if you want a cool way to learn about it
*only watched the first episode and thinks it sucks* |
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| 22 Jan 2013 10:48 AM |
| Still more fun than maths. |
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Fazana
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| Joined: 21 Feb 2009 |
| Total Posts: 28722 |
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| 22 Jan 2013 10:49 AM |
Chemistry is fun, espeically when you get to the explosive reactions!
#Eating Cake Since 1996. |
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| 22 Jan 2013 10:49 AM |
Increasing the concentration of reactants will also speed up a chemical reaction. Concentration means the number of things in a given space. Imagine putting a bunch of marbles into a shoebox and then shaking the box. The more marbles you put in the box, the more often the marbles will bump into each other. The same thing is true with molecules of reactants. When concentration is high, more molecules can bump into each other. The more molecules that collide, the faster the reaction. For example, a candle will burn much faster in pure oxygen than it will in air. This is because air contains other gases besides oxygen. Pure oxygen has more oxygen molecules available to react with the burning candle wax. siggyflip |
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| 22 Jan 2013 10:50 AM |
Another way to speed up a chemical reaction is to increase the surface area of the reactants. Think about starting a fire. It is easier to get a fire going with small pieces of wood than with a large log. When you break up an object into smaller pieces, the object's surface area increases. This means more of the reactant's surface is exposed. When more of the surface is exposed, more molecules can collide in a given time. More collisions mean a faster chemical reaction. Chemists often dissolve reactants in liquids to speed up a chemical reaction. Dissolving separates the reactants into individual molecules. This increases surface area. Another way to increase the surface area of a solid is to grind it up into a fine powder. siggyflip |
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| 22 Jan 2013 10:51 AM |
There is another way to speed up a chemical reaction without increasing the temperature, concentration, or surface area. You can use a catalyst. A catalyst is a substance that increases the rate of a reaction but isn't used up. A catalyst does not change as a result of the reaction. Therefore, it is never listed as a reactant in a chemical equation. The symbol for the catalyst is written above the arrow in the equation. Catalysts play a very important role in the interaction between the molecules of the reactants. In many cases they help hold the molecules in the proper orientation for a reaction to occur siggyflip |
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| 22 Jan 2013 10:52 AM |
How do catalysts speed up a chemical reaction? Their molecules form temporary bonds with the molecules of the reactants. These temporary bonds help the other bonds form more easily. Catalysts lower the amount of energy that atoms and molecules need to react when they collide. They can also help move the molecules into the best positions to react with each other. Enzymes are protein catalysts that your body makes. Enzymes act as catalysts in most of the chemical changes that happen inside your cells. There are many enzymes in your body. You need a large number of them because most enzymes assist only a single chemical reaction. siggyflip |
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MANTIS21
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| Joined: 12 Jan 2009 |
| Total Posts: 7123 |
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| 22 Jan 2013 10:53 AM |
oh boy an assesment siggyflip |
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pedres
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| Joined: 06 Nov 2009 |
| Total Posts: 12047 |
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| 22 Jan 2013 10:55 AM |
| im learning about electrolysis |
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| 22 Jan 2013 10:56 AM |
WOAHHH NOW WE GET INTO EXPLOSIONSS siggyflip |
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| 22 Jan 2013 11:03 AM |
>im learning about cells like srsly
are u srs
that was like 7th grade biology here in holland |
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