In which time period did ancient greek philosophers propose that all matter was composed of four fundamental substances: earth, air, water, and wind? 8000 b. c. – 1000 b. c. 1000 b. c. – 450 b. c. 300 b. c. – 1400 a. d. 1774 – 1794 a. d. time period 1 time period 2 time period 3 time period 4 time period 1 time period 2 time period 3 time period 4

Which statements correctly match a chemical name with its formula? use the list of polyatomic ions and the periodic table to you answer. the chemical formula for ammonium carbonate is nh4hco3. the chemical formula for ammonium hypochlorite is nh4clo. the chemical formula for ammonium nitrate is nh4no3. the chemical formula for ammonium phosphate is nh4(po4)3. the chemical formula for ammonium sulfate is (nh4)2so3.