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Science Chapter 2


anything that has mass and takes up space matter
3 ways that every sample of matter is classified as element, compound, or a mixture
a substance that cannot be broken down into simpler substances by chemical means. (example: Carbon) element
the smallest unit of an element that keeps the element's chemical properties atom
single type of matter pure substances
a substance made up of atoms of different elements chemically combined. (example: H2O) compound
each molecule of a compound contains how many elements that are chemically combinged 2 or more
study of the composition structure and properties of matter and the changes it undergoes chemistry
2 or more atoms joined together. The smallest unit of a substance that behaves like the substance molecule
not mixed with anything pure
matter that has a fixed compostition and definite properties pure substance
combination of substances that are not chemically conbined mixture
these are pure substances, but mixtures are not elements and compounds
substances are not evenly distributed (ex. salad) heterogeneous
components are evenly distributed (ex. gasoline & vinegar) homogeneous
properties of matter that are observed or measured without altering chemical makeup of substance physical properties
the temperature at which a substance changes from a solid to a liquid melting point
the temperature at which a liquid changes to a gas boiling point
measure of amount of matter contained in a certain volume of substance density
depends on gravity and mass weight
depends on volume and mass. Is a physical property density
properties of matter that depend on specific elements that make up substances. Describes two a substance changes into a new substance either by combining with other elements or breaking apart into new substances chemical properties
ability of substance to chemically combine with another substance reactivity
ability of a substance to burn flammability
properties that are most useful in identifying object that never change characteristic properties
characteristic properties can be what to things physical or chemical properties
What is the density equation D = M / V (Density = Mass / Volume)
density of a liquid or solid is usually expressed in.... g / cm3 (grams per cubic centimeter)
properties of compound are completely different elements chemically combined unique properites
a physical change affects one or more physical properties of a substance without changing the identity of the substance physical change
these can be separated by chemical changes mixtures
must be broken down by chemical changes compounds
combination of 2 or more substances that are not chemically combinded (retain identity) impure substances/mixtures
is the end of the flash cards? Yes
Created by: craig1823