How many valence electrons are in the electron-dot structures for the elements in group 3a (13) ?

The physical change of liquid water to water vapor is called a. desalination. c. condensation. b. evaporation. d. precipitation.

How many pizzas will you need if 32 people eat 3 slices per person and there are 8 slices per pizza

Chlorine has two naturally occuring isotopes - chlorine-35 and chlorine-37. Elaborate on how the atomic mass is determined given that chlorine-35 has an abundance of 75.78% and has a mass of 34.969 amu and that chlorine-37 has an abundance of 24.

What is the volume of an object with the mass of 7.9 grams in the density of 1.28g/ml.

Which statement is false? 1. Lone pairs of electrons repel each other more strongly than they repel bonding pairs. 2. Lone pairs of electrons repel each other more strongly than bonding pairs repel each other. 3.

Pure aluminum metal has a density of 2.70 g/cm

A 0.250-g chunk of sodium metal is cautiously dropped into a mixture of 50.0 g of water and 50.0 g of ice, both at 08C. The reaction is 2Na (s) 1 2H2O (l) 88n 2NaOH (aq) 1 H2 (g) DH 5 2368 kJ

How many moles of N are in 0.203 g of N2O?

An atom has a charge of +1 in its nucleus. Which statement must be true in order for this atom to have no net charge? A. The one positive proton has no influence on the overall charge of the atom. B.

A chemist uses 0.25 L of 2.00 M H2SO4 to completely neutralize a 2.00 L of solution of NaOH. The balanced chemical equation of the reaction is given below. What is the concentration of NaOH that is used?