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Stack #2081327
| answer | question |
|---|---|
| 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 gas ,color change,precipitate forms or temperature change |
| chemical changes | alter the chemical properties of matter ,new substances are formed |
| chemical changes | alter the chemical properties of matter ,new substances are formed |
| chemical equations | a shorter easier way to show chemical reactions by using symbols instead of words |
| chemical equations | a shorter easier way to show chemical reactions by using symbols instead of words |
| coefficant | a number placed in front of a chemical formula in a equation. tells how many atoms or molecules of each reactant and product take part in a reaction |
| coefficant | a number placed in front of a chemical formula in a equation. tells how many atoms or molecules of each reactant and product take part in a reaction |
| conservation of mass | the amount of matter involved in a chemical reaction does not change. the total mass of the reactants must equal the total mass of the products. |
| controlling rates of reaction | concentration temperature surface area catalyst enzymes and inhibitors |
| concentration | amount of one material in a given amount of another material |
| tempature | higher heat causes faster reactions |
| surface area | increased surface area= increased reaction |
| catalysts | materials that increases the rate of the reaction |
| enzymes | biological catalysts |
| inhibitors | decreases the rate of reaction |
| decomposition reaction | a compound that breaks down into similar substances |
| exothermic reaction | an observable change in energy that shows a chemical reaction took place a reaction that releases heat gives off energy makes it feel warmer most chemical reactions are this type |
| 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 changes | alter only the physical properties of matter no new substances are formed can be in size shape or color change in phase ( by increasing or decreasing temperature solid,liquid,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 writtenm on the right side of the formula |
| reactants | |
| products | the materials you have after a chemical reaction writtenm 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 from another substance ( also called displacement reaction) |
| states of matter | solid,liquid,gas |
| subscripts | show the number of atoms 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) |
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