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science 3 basic chem

chemical equations notes

the way chemical equations are set up: the formula for the reactants is on the left and the formulas for the products are on the right side
definition of a chemical equation when chemical reactions occur, two or more molecules interact to produce one or more unique or different product molecules.
Law of conservation of mass requires that both sides of a chemical equation show precisely the same number of atoms of each element represented
the arrow in a chemical equation means: yields; to produce
balancing chemical equations balancing requires manipulating the equation to show the number of different atoms are equal on the reactants and product side
Coefficents coefficients are the numbers that come before the "variables" in a chemical equation Ex. 2 H2O the coefficient is the 2 that comes before H2O you cant balance an equation without coefficents
Exothermic reactions a process that releases energy in the form of heat, Ex. boiling/evaporating liquid water, separating ions, and splitting gas molecules, etc.
Endothermic reactions a process or reaction that absorbs energy in the form of heat Ex. freezing water, solidifying solid salts,condensing water vapor, etc.
Rate of reaction: The measure of how quickly new substances form in a chemical reaction
Collision theaory "factors which impact the frequency of reactant collisions will impact the rate at which a chemical reaction occurs
chemical bonds compounds are formed , atoms of elements present, are joined together by transferring or sharing electrons. forming chemical bonds.
Created by: leximayhugh