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science chapter 2 vo
vocab for ch 2
| Question | Answer |
|---|---|
| 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 |
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zube
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