PropertiesDensity Mass/Volume QuantitativeViscosity A liquid’s resistance to ﬂowing QualitativeConducti How well something conducts heat/vity electricity QualitativeMalleabili The ability to be hit with a hammerty without shattering QualitativeHardness Whether one object scrapes another QualitativeMelting The temperature at which matter meltsPoint QuantitativeBoiling The temperature at which matter boilsPoint Quantitative
Physical Change A physical change is when you cut your hair or boil water. It’s when some of the properties change but the substance in it stays the same.
Separation• Filtration, if the particles are large enough to get stuck in a ﬁlter.• Distillation, separation based on different boiling points.
Distillation• Separating mixtures by their boiling points.• Ex: Separation of a unknown liquid 8
Filtration• Separating liquids based on particle size• Ex: Sulfur and salt lab 9
Evaporation• Extracting a dissolved solid from the liquid.• Ex: Sugar in water 10
Observing Chemical Properties• Can only be observed when the substance is changing into another substance.• Flammability: The ability to burn in the presence of oxygen. Paper in alcohol.• Reactivity: How easily a substance combines chemically with other substances. Rust with oxygen. 11
Recognizing Chemical Changes• You can tell when it changes because it may; Change Color - Produce Gas - Formation of a Precipitate. 12
Is it a Physical change or Chemical change• If it is a physical the composition stays the same.• If it is a chemical change the composition changes 13
Is curdling milk a Chemical or Physical change? 14
Which element is morereactive, oxygen or nitrogen? 15