The ground state electron configuration for sodium is:

a. 1s2 2s2 2p8.

b. 1s2 2s2 2p6 3s2 3p6 4s1.

c. 1s2 2s2 2p6 3s2 3p4.

d. 1s2 2s2 2p6 3s1.

Is methylene chloride more or less dense than water?

The air in a hot-air balloon at 735 torr is heated from 22.0°C to 46.0°C. Assuming that the moles of air and the pressure remain constant, what is the density of the air at each temperature? (The average molar mass of air is 29.0 g/mol.)

Calcium reacts with hydrochloric acid, HCI, to make calcium chloride and hydrogen gas (H2). 1) write a word equation for this reaction. 2) write a balanced symbol equation for this reaction.

Which sample contains the greater number of atoms, a sample of Li that contains 6.8 x 10^22 atoms or a 1.97 mole sample of Na?

Methane combines with oxygen in the air to make carbon dioxide and water vapor. Which of the chemical equations matches the reaction above? A. CH4 + 2O2 CO2 + 2H2O B. C2H4 + 2O2 2CO + 2H2O C. CH4 + 2CO2 2CO2 + 2H2O D. CH4 + 2O 2CO + 2H2O

Find the ratio of speeds of an electron and a negative hydrogen ion (one having an extra electron) accelerated through the same voltage, assuming non-relativistic final speeds. Take the mass of the hydrogen ion to be 1.67*10^{-27} kg.

A type of rock that undergoes changes because of heat and pressure

How many milliliters of a 1.25 molar HCL solution would be needed to react completely with 60 g of calcium metal Ca+2HCl - - > CaCl2 + H2

What mass of copper is required to replace silver from 4. oog ogre silver nitrate dissolved in water

What kind of bond would two nonmetals typically make?