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PT 7th Science
Chapter 2/3 Science Vocabulary
Question | Answer |
---|---|
a pure substance that cannot be separated into simpler substances by physical or chemical means; grouped into categories by the properties they share | element |
a substance in which there is only one type of particle | pure substance |
properties that do not depend on the amount of the element present; a unique set of properties | characteristic properties |
elements that are shiny and are good conductors of thermal energy and electric current | metals |
elements that are usually dull and that are poor conductors of thermal energy and electric current | nonmetals |
semiconductors, elements that have properties of both metals and nonmetals | metalloids |
a pure substance composed of two or more elements that are chemically combined | compound |
the only way to break down a compound is through a | chemical change |
a combination of two or more substances that are not chemically combined | mixture |
a mixture that appears to be a single substance; composed of particles of two or more substances that are distributed evenly among each other | solution |
the process in which particles of substances separate and spread evenly throughout a mixture | dissolving |
the substance that is dissolved | solute |
the substance in which the solute is dissolved | solvent |
a substance that is not able to dissolve | insoluble |
solid solutions of metals or nonmetals dissolved in metals | alloys |
a measure of the amount of solute dissolved in solvent | concentration |
the amount of solute needed to make a saturated solution using a given amount of solvent at certain tempature | solubility |
a mixture in which particles of a material are dispersed throughout a liquid or gas, but the particles are large enough that they settle out | suspension |
a mixture in which the particles are dispersed throughout but are not heavy enough to settle out | colloids |
having a regular, repeating pattern | periodic |
the smallest particle in which an element can be divided and still retain its properties | atom |
law that states that the repeating chemical and physical properties of elements relate to and depend on the element's atomic numbers | periodic law |
horizontal row of elements(from left to right) on the periodic table | period |
each column of elements (from top to bottom) on the periodic table, also called a family | group |
a property that can be observed or measured without changing the identity of the matter | physical property |
a property of matter that describes a substance based on its ability to change into a new substance with different properties | chemical property |
the ability of a substance to react with one or more other substances to produce a chemical change | reactivity |
a table of elements created by Dmitri Mendeleev; given this name because the properties of the elements repeat in a periodic way | periodic table of the elements |
a substance that conducts thermal energy or electrical charges well | conductor |
able to be drawn or pulled into wire | ductile |
able to be pounded into thin sheets without shattering | malleable |