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RSM Chp. Six
Question | Answer |
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matter | jis anything that mass and takes up space |
chemistry | the study of matter and how matter changes |
physical property | is a characteristic of a substance that can be observed without changing the substance into another substance |
chemical property | is a characteristic of a substance that describes its ability to change into other substances. |
physical change | is any change that alters the form or appearance of a substance but does make the substance into another substance |
chemical change | a change in matter that produces one of more new substances |
reactant | the substances that undergo change in a chemical reaction |
product | the substances formed by the reaction |
precipitate | is a solid that forms from solutin during a chemical reaction |
endothermic reaction | the total making and breaking of bonds results in a net absorption of energy. the energy is absorbed as heat from nearby matter, which cools |
exothermic reaction | the total making breaking of bonds results in a net release of energy The energy is released as heat into nearby matter |
chemical equation | is a short, easy way to show a chemical reaction using symbols instead of words |
conservation of matter | during a chemical reaction, matter is neither created nor destroyed. the total mass of the reactants must equal the total mass of the products |
open system | matter can enter from or escape to the surroundings. |
closed system | matter is allowed to enter or leave |
coeffiecient | is a number placed in front of a chemical formula in an equation |
synthesis | when two or more elements or compound combine to make a more complex substance |
decomposition | occurs when compounds break down into simpler products |
replacement | when one element replaces another in a compound or when two elements in different compounds trade places |
activation energy | is the minimum amount of energy needed to start a chemical energy |
concentration | is the amount of a substance in a given volume |
catalyst | is a materical that increases the rate of a reactin by lowering the activation energy |
enzyme | the cells in your body (all living things) contain biological catalysts |
inhibitor | a material used to decrease the rate of a reaction |
combustion | a rapid reatction between oxygen and a fuel |
fuel | is a material that releases energy when it burns |