HMS 7th grade Chemistry Vocabulary – Flashcards
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In the 400s, Nubian chiefs established three small kingdoms that prospered in large measure as a result of the rapid spread of ________________.
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animal-driven waterwheels
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the change of appearance, shape, or phase of matter of a substance but do not change its chemical make-up; still same substance
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physical change
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a combination of two or more substances that are not chemically combined; can easily separate the parts through physical means
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mixture
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a substance that conducts thermal energy(heat) or electric charges well
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conductor
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able to be drawn or pulled into a wire
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ductility
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a neutral group of atoms held together by covalent bonds; group of 2 or more atoms chemically combined
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molecule
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a property of matter that describes a substance based on its ability to change into a new substance with different properties
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chemical property
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the amount of matter in a given space or volume; the mass per unit volume of a substance
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density
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able to be pounded into thin sheets without shattering
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malleability
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the amount of solute needed to make a saturated solution using a given amount of solvent at a certain temperature; able to dissolve
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solubility
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creates new and different substances
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chemical change
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a pure substance composed of two or more elements that are chemically combined
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compound
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a mixture that appears to be a single substance but is composed of particles of two or more substances
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solution
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a property of matter than can be observed or measured without changing the identity of the matter
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physical property
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an arrangement of the elements according to their atomic numbers
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periodic table of elements
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the smallest unit of an element that has all the properties of that element
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atom
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elements that are shiny, malleable and good conductors of heat energy and an electric current
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metals
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the number of protons in the nucleus of an atom
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atomic number
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elements that are not shiny and are poor conductors of heat(thermal) energy and electric current
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nonmetals
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elements that have properties of both metals and nonmetals; sometimes referred to as semiconductors
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metalloids
