Term | Definition |
Activation Energy | what is needed to start a chemical reaction |
Arrow | also known as yields in a chemical equation or formula |
Characteristics of a Chemical Reaction | changes in energy or changes in properties |
Chemical Changes | alter the chemical properties of matter;new substances with new properties are formed |
Chemical Equations | a shorter, easier way to show chemical reactions by using symbols instead of words |
Coefficient | a number placed in from of a chemical formula in a equation. Tells how many atoms or molecules of each reactant and product take part in the 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. |
Concentration | amount of one material in a given amount of another material |
tgemperature | higher heat causes faster reactions |
Surface Area | increased surface area = increased reaction |
Catalysts | materials that increases the rate of reaction |
Enzymes | biological catalysts |
Inhibitors | decreases the rate of a 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 |
Exothermic Reaction | and 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 |
Physical Changes | alter only the physical properties of matter; no new substances are formed. Can be a change in size, shape, or color; change in phase |
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 |
States of Matter | solid, liquid, gas |
Subscripts | show the number of atoms of and element in a molecule or the ratio of elements in a compound |
Synthesis Reaction | two substances combine to form a new compound |