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science chapter 6

chemical reactions

QuestionAnswer
matter anything that has mass and occupies space
chemistry the study of the properties of matter and how matter changes
physical property a characteristic of a pure substance that can be observed without changing it into another substance
chemical property a property or characteristic of a substance that is observed during a reaction
physical change melting, transition to a gas, change of strength, change of durability, changes to crystal form, textural change, shape, size, color, volume and density
chemical reaction a process that leads to the chemical transformation of one set of chemical substances to another
precipitate the creation of a solid from a solution
endothermic reaction a reaction that forms energy in the form of heat
exothermic reaction a reaction that releases energy in the form of heat
chemical equation a short easy way to show a chemical reaction using symbols
reactants any substance that undergoes a chemical change in a given reaction.
products a substance formed as a result of a chemical reaction
conservation of mass the principle stating that matter is not created or destroyed during a chemical reaction
open system a system in which matter can enter from or escape to the surroundings
closed system a system in which no matter is to enter or leave
coefficient he numbers in front of the formulas.
synthesis two or more chemical species combine to form a more complex product.
decomposition The separation of a substance into simpler substances or basic elements
replacement where an element reacts with a compound and takes the place of another element in that compound
activation energy the reversible transition of a molecule into a nearly identical chemical or physical state
concentration the amount of a substance per defined space
catalyst a substance that speeds up a chemical reaction, but is not consumed by the reaction
enzymes Proteins that speeds up the rate of a chemical reaction in a living organism
inhibitor a substance that decreases the rate of, or prevents, a chemical reaction
combustion a chemical change that produces heat and light
fuel any compound that has stored energy
Created by: 088103