Chemistry final review questions and answers well illustrated.

Chemistry final review questions and answers well illustrated. intensive properties - correct ds on what type of matter (ex: denisty, composition, atomic structure) extensive properties - correct ds on how much matter you have (amount of matter), ex: mass, volume, shape homogenous mixtures - correct phase (part that you can see), individual parts not visible (ex: solutions) heterogenous mixture - correct re does not appear the same throughout (ex: colloids, suspenisons, and blood) pure substances - correct only be separated by chemical means separation techniques - correct r 2. magnet 3. distillation (separation of boiling points) separation 5. chromotography 6. centrifuge law of conservation of matter - correct r is not created or destroyed, it just changes forms accuracy - correct answers.a measure of how a close measuremnet come to the actual or true value precision - correct answers.a measure of how close a series of measurements are to one another percent error - correct answers.(|experimental value-accepted value|/accepted value) x 100 adding or subtracting sig figs - correct to the least # of decimal places multiply/ divide sig figs - correct answer to least # of sig figs evidence of a chemical change - correct change, gas, water is a new product density - correct intensive property that depends on the composition of a substance, used to identify a substance, d=m/v atom - correct smallest particle of an element that retains its identity in a chemical reaction Democritus - correct answers.1st person to identiy the atom John Dalton - correct answers.1st theory to relate chemical changes to events at the atomic level. his theory: 1. all elements are composed of tiny indivisible molecules called atoms 2. atoms of the same element are the same 3. atoms of different elements can physically mix together 4. atoms of different elements can chemically combine to form a compound William Crookes - correct ted the cathode ray tube J.J. Thompson - correct vered the electron. Thought the atom was a positive sphere with negatively charged electrons throughout: plum pudding model Ernest Rutherford - correct the nucleus; gold foil experiment, used (positive) alpha particles and a narrow beam of particles directed at a sheet of gold Neils Bohr - correct rons move in a circular orbit at fixec distances from the nucleus, an electron can gain or lose energy by changing its orbit; planetary model CHADWICK - correct neutron Erwin Schrodinger and quantum mechanics - correct ron clouds Medeleev - correct shed a table of elements (periodic table), arranged the elements in order of increasing atomic mass; found repating patterns in properties, and left empy spaces in the table Moseley - correct mined atomic # for each known element; arrangted the elements in order of increasing atomic number; "father of the modern perodic table" period - correct ontal row of elements arranged in order of increasing atomic number's family - correct ns of related elements proton - correct answers.+1 charge, 1 amu, located in the nucleus