2 How Are You Identified? Eye Color Hair Color* Skin Color Fingerprints DNAThese are all characteristics you have that will stay with you for life and can be used to identify you.*may change due to age or vanity
3 Matter is stuff First, A Quick Review Matter is anything that has mass and takes up space.Matter is the “stuff” (atoms and molecules) that makes up the universeMatter is stuff
4 Examples of Stuff (aka matter) Plants, animals, rocks, water, soda, air, oxygen are all examples of matterMatter can be living or non livingMatter can be solid, liquid or gasThey are all made of atoms and moleculesThey all have mass and take up spaceThey are all “stuff”. Yet all of the examples of stuff listed above are differentThey all have different characteristics or properties that can be used to identify themCharacteristics of matter can be either physical properties or chemical properties
5 Characteristic Properties of Matter Characteristic properties help scientists identify a particular substanceCharacteristic properties are always the same for each kind of matterCharacteristic properties do not change even though the shape or amount of matter may changeCharacteristic properties are like the eye color, hair color, skin color, fingerprints and DNA of matter
6 property= an attribute, quality, or characteristic of something. physical property=A quality of a substance that can be observed or measured.chemical property= A quality of a substance that has to do with the way it reacts with other substances
7 What Are Some Physical Characteristic Properties? Physical properties can beseen or measured without changing the identity of the substanceidentified or described with your sensesMelting point, boiling point, freezing pointState of matter at room temperature (solid, liquid or gas)DensityMagnetic propertiesSolubility (will it dissolve in another substance?)Conductivity (will it conduct heat, electricity)Ductility, malleability (can it be drawn into a wire or pounded into a thin sheet)
8 What Are Some Physical Characteristic Properties?
9 What Are Some Chemical Characteristic Properties? Chemical propertiesmay not be observed with your senses.determines how a substance interacts with another substance.determine if the substance can change into a new substance with different properties.FlammabilityReactivity (how it behaves in the presence of another substance)Oxidation (another word for rust and tarnish)
10 What Are Some Chemical Characteristic Properties?
11 Can You Identify? Physical Properties: Liquid at room temperature Boiling point is 100 0CColorlessDensity is 1 g/cm3That was easy!
12 Let’s Try Another! Physical Properties Density is 8.96 g/cm3 Insoluble in H2ODuctile, malleableChemical PropertiesOxidizesReacts with acidsHint?What do you think the flame is made of?Does gold (Au) oxidize? How do you know?