Why are alkali metals unsafe to hadle.

Which of the following is true for an exothermic reaction? A. The enthalpy of the products is greater than that of the reactants. B. The enthalpies of the reactants and the products are equal. C.

Calculate the number of molecules and atoms present in 124 g of phosphorus

The density of a liquid can be determined by weighing a known volume of the liquid in a graduated cylinder. The data from the experiment is as follows: weight of cylinder 10.8 grams; weight of cylinder and liquid 12 grams; reading from cylinder 7.

What is the molarity of a solution of nitric acid if 0.283 g of barium hydroxide is required to neutralize 20.00 mL of nitric acid?

An organic compound contains only carbon, hydrogen, and chlorine. Combustion of a 1.50-g sample produces 3.52 g of CO2. In a separate reaction, a 1.00-g sample reacts with Ag+, producing 1.27 g of AgCl. What is the compound's empirical formula?

What is the molar mass of ethanol (C2H60) ?

J. J. Thomson A) Electrons are in orbital levels. John Dalton B) Atoms are the smallest unit of an element. Ernest Rutherford C) Electrons are scattered within the atom. Niels Bohr D) Protons are at the center of an atom.

What is the total number of protons and neutrons in an atom called?

Which of the following has to remain constant to allow you to use the combined gas law for calculations?

For the first ionization energy for an N2 molecule, what molecular orbital is the electron removed from