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chemistry (first twenty elements in the periodic table (hydrogen, helium,…
chemistry
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structure of a atom
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the electrons are located in the cells around the nucleus and the outermost shell is the valance shell
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the atomic weight is the protons and neutrons combined so the number of neutrons can be found by subtracting the number of protons from the atomic weight
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there are the same number of protons and electrons because they have opposite charges and, with a even number of protons and neutrons, their charges are balanced
ions
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have a charge because there are either more electrons or protos and so it is positive or negitive to a certain amount.
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periodic table
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groups go down in the periodic table and the elements in the same group have the same number of electrons in their valance shell
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rates of reaction
rate of reaction is a measure of how fast a reaction occurs and causes its reactants to become products
an increase in the rate of reaction is caused by a increase in the number of successful collisions per unit of time
the four factors that effect the rate of reaction are surface area, temperature, concentration, and catalysts.
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collision theory
collision theory is the theory tat, for a reaction to occur, particles must collide with the correct orientation and sufficient force.