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a combination of 2 or more substances that are note chemically combined

*Chemicals can form mixtures

*No chemical change happens when a mixture is made

a mixture is a physical change

solution is a homogeneous mixture

*The component that is present in the largest amount is called the solvent

*Substances present in smaller amounts are called solutes

*A measure of the amount of solute in a given amount of solvent is concentration

*Solubility refers to the ability of a solute to dissolve in solvent at a certain temperature

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*a pure substance composed of 2 or more elements that are chemically combined

chemical change,or reaction,happens when one or more substance are changed into one or more other substance

*properties of  compound can be very different from those of its elements

chemical reactions,two or more elements combined to form a compound

*Chemical properties include changes that occur when compounds are exposed to other chemicals or heat or light

properties of a compound differ,not only from those of other compounds,but also from those of its elements

*some compounds can be broken down into their elements by applying heat or using electricity

*Every compound has a unique set of properties

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*a pure substance that cannot be separated into simpler substance by chemical or physical methods

*a material in which all of the basic particles are identical

* physical properties include hardness,melting point,and density

* Chemical properties include reactivity and flammability

* major categories or elements; Metals,nonmetals and metalloids

* Metals conduct heat or electric current well

*Nonmetals do not conduct heat and electric current very well

*Metalloids have some of the properties of metal and some of the   properties of nonmetals