front 1 physical properties | back 1 can be observed without changing a substance into another substance boiling point, density, mass, volume |
front 2 examples of physical properties | back 2 boiling point, density, mass, volume |
front 3 chemical properties | back 3 can only be observed when a substance is changed into another substance |
front 4 example of chemical properties | back 4 flammability, corrosiveness, reactivity with acid |
front 5 intensive properties | back 5 independent of the amount of the substance that is present |
front 6 examples of intensive properties | back 6 density, boiling point, color |
front 7 extensive properties | back 7 dependent upon the amount of the substance present |
front 8 example of extensive properties | back 8 mass, volume, energy |
front 9 physical changes | back 9 changes in matter that do not change the composition of a substance |
front 10 examples of physical changes | back 10 change of state, temperature, volume |
front 11 chemical changes | back 11 changes that result in new substances |
front 12 example of chemical changes | back 12 combustion, oxidation, decomposition |
front 13 dalton's postulates | back 13 concept that matter is conserved and made up of unique elemental substances formed by atoms |
front 14 who discovered electron by the cathode-ray tubes | back 14 jj thompson |
front 15 who measured the electron by the oil drop experiment | back 15 robert millikan |
front 16 Who discovered the radioactivity? | back 16 Becquerel and the Curies |
front 17 Who discovered the nucleus protons by the gold-foil experiment | back 17 ernest rutherford |
front 18 Who discovered neutrons | back 18 Chadwick |
front 19 atomic number | back 19 number of electrons or protons |
front 20 atomic mass | back 20 number of protons + neutrons |
front 21 isotopes | back 21 same element, different number of neutrons |
front 22 Group 1 | back 22 alkai metal |
front 23 Group 2 | back 23 akaline earth metal |
front 24 Group 6 | back 24 chalcogens |
front 25 group 7 | back 25 halogens |
front 26 group 8 | back 26 noble gas |
front 27 empirical formulas | back 27 give the lowest whole number of ratio of atoms of each element in a compound |
front 28 molecular formulas | back 28 give the exact number of atoms of each element in a compound |
front 29 formula weight | back 29 sum of the atomic weights for the atoms in a chemical formula |
front 30 molecular weight | back 30 sum of the atomic weights of the atoms in a molecule |
front 31 limiting reactants | back 31 reactant present in the smallest stoichiometric amount |