Warm Up 1. What is the phase change associated with turning ice into liquid water? 2. What is the phase change associated with “sweat” on a soda bottle?

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Presentation transcript:

Warm Up 1. What is the phase change associated with turning ice into liquid water? 2. What is the phase change associated with “sweat” on a soda bottle? 3. What is the phase change associated with how deodorant works? 4. What is plasma? Why is plasma a good conductor of electricity?

Properties of Matter

Matter Definition - anything that has mass or takes up space ex. everything

Properties of Matter Two types of properties - chemical and physical

Physical Properties of Matter Definition - a characteristic of a substance that can be observed or measured without changing the composition of the substance ex. viscosity, conductivity, malleability melting point, boiling point - remain the same for all pure substances

Physical Properties of Matter Viscosity - the tendency of a liquid to keep from flowing - the greater the viscosity, the slower the liquid moves ex. oil vs. honey - will usually decrease when it is heated Conductivity - materials ability to allow heat to flow ex. metal vs. wood

Physical Properties of Matter Malleability - ability of a solid to be hammered without shattering ex. silver vs. glass Hardness - can be compared by examining which object scratched ex. knife against copper sheet copper sheet will scratch

Physical Properties of Matter Melting/Boiling points - Melting pt.: temperature at which a substance changes from a solid to liquid ex. ice cube at room temperature - Boiling Pt.: temperature at which a substance boils ex. water boils at 100o C Density - the ratio of a materials mass to its volume - D= M/V

Physical Properties of Matter What do we use physical properties for? - identify a material - chose a material for a specific purpose - to know the best method to separate the substances in a mixture filtration: separates materials based on size

Physical Properties of Matter When does a physical change occur? - some of the properties of the material have changed, but the material remains the same ex. tearing/crumpling a piece of paper cutting your hair **ask yourself is it still the SAME substance**

Chemical Properties of Matter Definition - any ability to produce a change in the composition of matter - can only be observed when the substances in a sample of matter are changing into a different substance

Chemical Properties of Matter Cont. Reactivity - describes how readily a substance combines chemically with other substances ex. iron turns to rust in the presence of oxygen Flammability - material’s ability to burn in the presence of oxygen ex. newspaper, gasoline