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Key terms

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Chance Williams

on 10 March 2016

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Transcript of Key terms

Chapter 12 test
Chance Williams
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.
Key terms
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.

Key Terms
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.
Key Terms
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

single/double replacements
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.

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