1-Calculate the molality of a 5.86 M ethanol (C2H5OH) aqueous solution whose density is 0.927 g/mol. (EXAMPLE 13.3). 2. Calculate the molality of a 44.6 percent (by mass) aqueous solution of sodium chloride. (EXAMPLE 13.4).

3. Calculate the molar concentration of oxygen in water at 25°C for a partial pressure of 0.22 atm. The Henry's law constant for oxygen is 1.3 3 1023 mol/L ? atm. (EXAMPLE 13.5).

When a scientific theory has been tested and proved by the scientific community, it becomes a law

Astable electron arrangement for an atom is one that does not easily change. how is this arrangement arrived at? a. valence electrons are transferred or shared to create a full outer shell of electrons. b. valence electrons are discarded into space to create a full outer shell of electrons. c. protons (positive charge) pair with valence electrons (negative charge) to create a strong bond. d. outer shells with valence electrons are transferred or shared.

State one important difference between a physical change and a chemical change?