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Chemical Reactions
Chapter 5
Term | Definition |
---|---|
Physical Change | A change that alters the form or appearance of a material but does not make the material into another substance. |
Chemical Change | A change in which one or more substances combine or break apart to form new substances. |
Reactant | A substance that enters into a chemical reaction. |
Products | A substance formed as a result of a chemical reaction. |
Presipitate | A solid that forms from a solution during a chemical reaction. |
Exothermic Reaction | A reaction that releases energy, usually in the form of heat. |
Endothermic Reaction | A reaction that absorbs energy. |
Chemical Equation | A short easy way to show chemical reactions. |
Law of Conservation of mass | The principle that the total amount of matter is neither created nor destroyed during any chemical or physical change. |
Open System | A system in which matter can enter from or escape to the surroundings. |
Closed System | A system in which no matter is allowed to enter or leave. |
Coefficient | A number in front of chemical formula in an equation that indicates how many molecules or atoms of each reactant and product are involved in a reaction. |
Sythesis | A chemical reaction in which two or more simple substance combine to form a new, more complex substance. |
Decomposition | A chemical reaction that breaks down compounds into simpler products. |
Replacement | A reaction in which one element replaces another in a compound or when two elements in different compounds trade places. |
Activation Engery | The minimum amount of energy needed to start a chemical reaction. |
Concentration | The amount if one material in a certain volume of another Material. |
Catalyst | A material that increases the rate of a reaction by lowering the activation energy. |
enzymes | A type of protein that speeds up a chemical reaction in a living thing; a biological catalyst that lowers the activation energy of reaction in cells. |
inhibitor | A material that decreases the rate of a reaction. |