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Physical properties- measured without changing the identity and composition of the substance(color, odor, density, hardness, melting and boiling pt.) Chemical properties - describe the way a substance may change or react to form other substances (flammability) Intensive properties - used to identify substances, do not depend on the amount of the sample being examined - temp., melting pt, and density Extensive properties - depend on the quantity of the sample and include measurements of mass and volume, relate to the amount of substance present. Precision - a measure of how closely ones measurements agree with one another Accuracy - how closely ones measurements agree with the correct or true value Celsius scale - the everyday scale of temperature in most countries 0 degrees celsius - feezing, 100 degrees celsius - boiling pt of water, 37 degrees celsius - normal body temp. Kelvin scale - the SI temp. scale, and the SI unit of temp. is the kelvin K =degrees C + 273.15 Heterogeneous mixture - do not have the same composition properties and appearance throughout the mixture(sand, rocks, wood) Homogeneous mixture - mixtures that are uniform throughout(seawater, gasoline) Law of constant composition - in a given compound the relative numbers and kinds of atoms are constant Law of conservation of mass - the total mass of materials present after a chemical reaction is the same as the total mass before the reaction Law of multiple proportions - if two elements A and B combine to form more than one compound, the masses of B that can combine with a given mass of A are in the ratio of small whole numbers.
Approximate Word count = 1012
Approximate Pages = 4
(250 words per page double spaced)
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