The periodic table is organized by a) atomic mass. b) atomic size. c) atomic number. d) atomic periodicity.

Who answers the three economic questions in a market economy? How is this different from command economy?

Explain how the biosphere, geosphere and atmosphere are interconnected

The nucleus of an atom is a. the central core and is composed of protons and neutrons. b. positively charged and has more protons than neutrons. C. negatively charged and has a high density. d. negatively charged and has a low density.

Which sub shell is likely to be filled after the rest of the sub shells at a particular energy level? 1. p 2. f 3. d 4. s

Moles of Cu in 7.8 * 10^21 atoms of Cu

What defines a material as being a mixture?

What do igneous rocks form from? (20pts!)

A gas at STP has a volume of 1.0 liter. If the pressure is doubled and the temperature remains constant, the new volume of the gas will be ... ?

Combustion analysis of toluene, a common organic solvent, gives 8.20 mg of co2 and 1.92 mg of h2o. if the compound contains only carbon and hydrogen, what is its empirical formula?

Why does the moon have phases? What are the four main phases of the moon? How long does it take to change from one to another?