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Transcript of Key terms
chemical reaction-a process in which atoms of one or more substances rearrange to form one or more substances.
chemical equation-is a description of a reaction using elements symbols and chemical formulas.
Reactants-The starting substances in a chemical reaction.
Products-The substances produces by the chemical reaction.
Law of conservation of mass-states that the total mass of the reactants before a chemical reaction is the same as the total mass of the products after the chemical reaction.
coefficient-a number placed in front of an element symbol or chemical formula in a equation.
synthesis-is a type of chemical reaction in which two or more substances combine and form one compound.
decomposition-a reaction in which one compound breaks down and forms two or more substances.
single-replacement-a reaction in which one element replaces another element in a compound.
Double-replacement-is a reaction in which the negative ions in two compounds switch places forming two new compounds.
Combustion-a chemical reaction in which a substance combines with oxygen and releases energy.
endothermic-Chemical reaction that absorbs thermal energy.
Exothermic-reaction is a chemical reaction that releases thermal energy.
Activation energy-is the minimum amount of energy needed to start a chemical reaction.
catalyst-a substance that increases reaction rate by lowering the activation energy of a reaction.
enzyme-is a catalyst that speeds up chemical reactions in living cells.
inhibitor-is a substance that slows or even stops a chemical reaction.
1.According to the law of conservation of mass, three atoms of calcium can react to produce six atoms of calcium. F
2.Energy is needed to break bonds in chemical reactions. T
3.A chemical reaction in which more energy is absorbed than released is endothermic.T
Change in odor, color, formation of bubbles, formation of a precipitate Examples of changes in properties
Warming or cooling, release of light are Examples of changes in energy
Precipitate is a solid formed when two liquids react
Things to know
Ancatalyst is a substance that increases the rate of a chemical reaction.
Energy is needed to break chemical bonds.
Antoine Kaurent Lavoisier discovered the law of conservation of mass.
Enzymes-a substance produced by a living organisym that acts as a catalyst to bring out a specific biochemical reaction.