2.) Determine the concentration of citric acid if a 20.00 mL sample is titrated with 29.06 mL of 0.385 M sodium hydroxide. (10 points)
C, H,O(COOH)2 (aq) + 3 OH' (aq) - C, H,O(COO), (aq) + 3 H20 (1) (net-ionic reaction)

Compare and contrast the bohr model and the electron cloud models of the atom.

The bond energy for the van der waals bond between two helium atoms is 7.9×10−4ev. assuming that the average kinetic energy of a helium atom is (3/2)kbt, at what temperature is the average kinetic energy equal to the bond energy between two helium atoms

Why does earth rotate? because earth is formed from cold gases collapsing due to gravity because the matter in the nebula that formed earth was spinning because earth forms more than 99% of the mass of the solar system because the hydrogen atoms inside the nebula fused to form helium