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1. What is 0.000 020 3 expressed in scientific notation? a. 2.03 x 10^5 b. 2.03 x 10^-5 c. 2 030 000 d. 203 2. What is 976.23 expressed in scientific notation? a. 976.23 b. 976.23 x 10^2 c. 976.23 x 10^-2 d. 976.23 x 10^4 3. Avogadro's number is a. 6.022 x 10^23 b. 1.602 x 10^-24 c. 3.1416...

SAYS: 1.) Dalton's atomic theory does NOT support which of the following observations? a. Matter is neither created nor destroyed in chemical and physical changes. b. Atoms of most elements are made up of protons, neutrons, and electrons. c. NO and NO2 are compounds of nitrogen and oxygen...