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science chapter 2 vo

vocab for ch 2

physical property viscosity, conductivity, malleability, hardness, melting point, boiling point, density
viscosity the tendency of a liquid to keep from flowing - its resistance to flowing
conductivity a materials ability to allow heat to flow
malleability the ability of a solid to be hammered without shattering
melting point the temperature at which a substance changes from solid to liquid
boiling point the temperature at whcih a substance boils
filtration the process that separates materials based on the size of their particles
distillation a process that separates the substances in a solution based on their boiling points
physical change occurs when some properties of a material change but the substances in the material don't change
chemical property is any ability to produce a change in the composition of matter
chemical properties can be observed only when the substances in a sample of matter are changing into different substances
flammability materials ability to burn in the presence of oxygen
reactivity the property that describes how readily a substance combines chemically with other substances
chemical change occurs when a substance reacts and forms one or more new substances
precipitate a solid that aforms and separates from a liquid mixture
pure substance matter that always has the same composition
element a substance that cannot be broken down into simplier substances
atom the smallest particle of an element
an element has a fixed composition because it contains only one type of atom
compound a substance that is made from two ormore simpler substances and can be broken down into simpler substances
a compound always contains two or more elelments joined in a fixed proportion
heterogeneous misture parts of the mixture are noticeably different from one another
the properties of a mixture can vary because the composition of a mixture is not fixed
homogeneous mixture substances are evenly distributed , it is difficult to distinguish one substance in the mixture from another
solution when substances dissolve and form a homogeneous mixture
suspension a heterogeneous mixture that separates into layers over time
colloid contains particles that are intermediate in size between the small particles in a solution and the larger particles in a suspension
Created by: zube