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7th grade chemistry

absolute zero the temperature at which all molecular motion stop
amorphous solid a solid that is , when the molecules in the liquid slowly stop movie but do not corm any type of pattern
atomic mass unit the average mass of one proton or one neutron
atomic number the number of proton found in the nucleus of an atom
boiling change from a liquid to a gas is happening withing the liquid and not just at the surface
chemical change a change that occurs at the molecular level when the process is don e there is a totally new substance with properties and characteristies
chemical properties properties of matter that can not be observed or measured without changing the substance
condensation the change of state where energy is lost and molecules no longer have enough energy to fly around,making them come together they can still flow past one another but they can not break free
crystalline solid a solid that is formed when the molecules in the liquid slowly stop moving and arranged themselves i a regular, repeating pattern
density a physical property of matter that describes how much matter can be found in a given volume
electron negatively charged particle that is found zipping around the outside of an atom, responsible for holding and creates the volume of an atom
endothermic a chemical reaction in which energy is absorbed will feel cold to the volume of an atom
evaporation the change of state where the molecules at the surface of a liquid are gaining enough energy to break away even if the needed temperature is not reached
exothermic a chemical reaction in which energy is released usually in the form of heat,light
family or group words used to identify a column on the periodic table
fluid the word used to describe any substance whose molecules are able to flow past one another
freezing the change of state where energy is lost and molecules be one fixed in a position no longer able to go freely past one another
ion word used to describe an atom that has gained or lost an electron resulting in an electric charge
isotope word used to describe an atom that has a different number of proton and neutron in the nucleus
law of conservation of mass/matter this law states that matter can not b created or destroyed it will only change the arrangement of all the molecules but there will not be more less
melting good conductors of heat and electricity they are ductile and malleable and tend to found as solids at room temperature
metal good conductor of heat and electricity
metalloid element that have properties of both metals and non-metals
period a row on the periodic table
solubility the amount of one substance that will dissolve into another substance
sublimation when molecules at the surface of a solid gain enough energy to change directly to a gas, by passing the liquid state
vapor word used to describe a gas that is usually found in a liquid at room temperature
Created by: midnightt