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Unit 2 6th Grade

Matter and Its Properties

TermDefinition
matter anything that has mass and takes up space
atom the smallest particle of an element that still has the same chemical properties of the element
physical property a property that can be observed without changing the identity of a substance
mass the amount of matter in an object
weight the measurement of the pull of gravity on an object
volume the amount of space that matter takes up
density the measurement of how much mass fits within a certain volume
fluid a material that can flow and has no definite shape
buoyancy the upward push of a liquid or a gas on an object placed in it
Archimedes' Principle the idea that the buoyant force on an object is equal to the weight of the fluid displaced by the object
solid matter that has a definite shape and occupies a definite amount of space
liquid matter that takes up a definite amount of space but has no definite shape
gas matter that has no definite shape and does not take up a definite amount of space
temperature a measurement of how hot or cold something is
melting point the temperature at which a solid melts to become a liquid
freezing point the temperature at which a liquid changes into a solid
boiling point temperature at which a liquid becomes a gas
chemical property the way a substance reacts with other substances
reactivity how easily something reacts with something else
acid a substance that has a pH below 7, tastes sour, and makes blue litmus paper turn pink or red
base a substance that has a pH above 7, tastes bitter, and makes red litmus paper turn blue
neutralization the chemical change of an acid and a base into water and a salt
physical change a change in size, shape, or state that does not form a new substance
chemical change a change in matter that produces a new substance with different properties from the original
precipitate a solid formed by the chemical reaction of two liquids
chemical bonds a force that holds atoms together
chemical reaction a process that produces chemical change, resulting in new substances that have properties different from those of the original substances
reactants an original substance at the beginning of a chemical reaction
products the new substance produced in a chemical reaction
chemical equation a way to represent a chemical reaction by using symbols for the amounts of reactants and products in the change
law of conservation of mass a physical law states that matter is not created or destroyed during a chemical reaction
Created by: SSmith01
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