How many valence electrons do the alkaline earth metals have?

How many moles are in. 5g of sodium bromide?

What substance can act as catalysts in the body?

Humpty Dumpty weighs 400 Newtons. He falls off a wall 3 m high. How much work was done by gravity on Humpty Dumpty?

This form of matter has no definite shape but it has volume. A. Liquid B. Gas and Liquid C. Solid E. Solid D. Liquid and Solid F. Gas

Which of the following pairs of elements is most likely to form an ionic compound? nitrogen and sulfur sodium and aluminum magnesium and fluorine oxygen and chlorine

Ice (H2O) melting at 273 K and 1 atm has = 6.01 kJ/mol and = 6.01 kJ/mol while water vaporizing under the same conditions has = 37.6 kJ/mol and = 40.7 kJ/mol. Why is there such a large difference between and, but not for and?

What happens to the charges when an ionic compound forms

We dissolve 93 grams of sodium sulfate (Na2SO4) in 20 grams of water. What is the percent by mass of sodium sulfate in this solution? Answer in units of %.

The modern atomic model includes electrons orbiting the nucleus. which of the following parts of dalton's atomic model was disproved by the discovery of the electron? - atoms are tiny particles. - atoms cannot be divided into smaller parts.

tandard reduction potentials are 1.455 V for the PbO2 (s) / Pb (s) couple, 1.82 V for Co3 (aq) / Co2 (aq), 3.06 V for F2 (g) / HF (aq), 1.07 V for Br2 (l) / Br - (aq), and 1.77 V for H2O2 (aq) / H2O (l).