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CHEMICAL REACTIONS
Chemical reaction flash cards
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 |
chemical changes | alter the chemical properties of matter, new substances with new properties are formed |
chemical equation | a shorter, easier way the show chemical reactions using symbols instead of words. |
Coefficient | a number placed in front of a chemical formula in an 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 reactantsmust equal the total mass of the products. |
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 | 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. |
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 an element in a molecule or the ratio of elements in a compound. |
Synthesis Reaction | two substances combine to form a new compound |