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chemistry vocab
chemistry part two vocabulary
Term | Definition |
---|---|
activation energy | what is needed to start a chemical reaction |
arrow | you read the arrow as yields in a chemical equation or formula |
characteristics of a chemical reaction | changes in energy or changes in properties produce gas or bubbles color change precipitate forms or temperature change |
chemical change | alter the chemical properties of matter; new substances with new properties are formed |
chemical equation | a shorter easier way to show chemical reactions by using symbols instead of words |
coefficiant | a number placed in front of a chemical formula in an equation. Tells how many atoms or molecules of each reactant must equal the total mass of the products |
conservation of matter | the amount of matter involved in a chemical reaction does not change. The total mass of the reactants must equal the total mass of products |
controlling rates of reaction | concentration temperature surface area catalysts enzymes and inhibitors |
concentration | amount of one material given amount of another material |
temperature | higher heat causes faster reactions |
surface area | increased surface area = increased reaction |
catalysts | materials that increase the rate of reaction |
enzymes | biological catalysts |
inhibitors | decreases the rate of reaction |
decomposition reaction | a compound breaks down into simpler substances |
endothermic reaction | an observable change in energy that shows a chemical reaction took place a reaction that takes heat from the solution absorbs energy makes it feel cooler |
physical change | alter only the physical properties of matter no new substances are formed can be change in size shape or color change in phase by decreasing temperature solid liquid and gas |
precipitate | a solid that forms from solution during a chemical reaction observable change that shows a chemical reaction took place |
products | the materials you have after a chemical reaction written on the right side of the formula |
reactants | the materials you have at the beginning of a chemical reaction written on the left side of the formula |
replacement reaction | one part of a compound is displaced by an element or compound from another substance also called displacement reaction |
states of matter | solid liquid and gas |
subscripts | shows the number of an element in a molecule or the ratio of elements in a compound |
synthesis reaction | two substances combine to form a new compound also called composition reaction |