Presentation on theme: "Properties of Matter All forms of matter have properties."— Presentation transcript:
1 Properties of Matter All forms of matter have properties. Examples: hardness, texture, odor, color, flammability, etc.Two categories:pure substance-made of only one kind of material and has definite propertiesmixture-two or more substances mixed together but not chemically combinedex: concrete, salt water-solutions – best mixed of all possible mixturesex: sugar water
2 Properties of Matterelements – pure substances that cannot be broken down into other substances by any chemical meanselements can be chemically combined to form compoundsex: hydrogen, oxygen.. Periodic Tablecompound – a pure substance formed from chemical combinations of elementscompounds have different properties from the elements that formed themex: water (H2O), carbon dioxide (CO2)
3 Properties of Mattercharacteristic property – a property that always holds true for a substancecharacteristic properties never change, they can be used to identify unknown matter.ex: boiling & melting pointsComparing boiling and melting points can be used to identify different substances.
4 Properties of Matter physical property -characteristics of a substance that can be observed without changing the identity of the substanceex: color, size, texture, density, volume & massphysical change:-a change in any physical property of a substance, not in the substance itself
5 Phase change - Physical When matter changes from one form to another, the substance does not change.Only the arrangement, space and movement of molecules.Define the following:-melting-freezing-boiling-evaporation-sublimation-condensation-deposition
6 Phase change - Physical melting- solid becomes a liquid (particles gain energy)*melting point- temp at which a solid begins to meltfreezing- liquid becomes a solid (particles lose energy)*freezing point- temp at which a liquid begins to freeze***melting and freezing point of a substance are the same***
7 Phase change - Physical boiling- liquid becomes a gas (produces bubbles)*boiling point- temp at which a liquid begins to turn to gasevaporation- liquid becomes a gas (occurs at surface of a liquid)sublimation – solid changes directly to a gasex: dry ice (solid CO2) – turns to gas
8 Phase change - Physical condensation- gas changes to a liquiddeposition- gas changes directly to a solid“The Chem Life”
9 Properties of Matter chemical property -describes how one or more substances can form new substancesex: combustibility, rusting and tarnishingchemical change:-when one or more substances change into a different substance-combinations of atoms rearrange to make new substances
10 Properties of Matterproduction of an odor- some chemical changes produce new smellschange in temperature- chemical changes often are accompanied by a change in temperature (increase or decrease)change in color- a change in color often indicates a chemical change (color change will not be reversible)formation of bubbles- the formation of gas bubbles is an indicator that a chemical change has occurredformation of a solid- when two liquids combine, a solid called a precipitate may form, indicating a chemical change
11 Properties of Matter Pop Quiz Decide whether each statement describes aphysical or chemical change.A bicycle left out in the rain begins to rust.A match burns, leaving only a charred stick of wood.A copper wire is cut into five smaller pieces.An ice cube melts.A glowing splint placed in a test tube causes a loud “pop”.Food coloring is added to cake icing to make it pink.
12 Properties of Matter Pop Quiz Gasoline burns in a car engine.Antifreeze is added to a car radiator to lower the freezing point.A spoonful of sugar is dissolved in cup of coffee.A silver knife and fork tarnish when they are exposed to air for several weeks.Leaves of a maple tree turn bright red as winter approaches.A water molecule gains enough energy to enter the vapor phase.