If the atomic number of an element is 6 and its mass number is 4 how many neutrons are contained in the nucleus? A. 14 B. 6 C. 8 D. 20

For each pair of gases, select the one that most likely has the highest rate of effusion. Use the periodic table if necessary.

Explain why the pH of a hydrochloric acid increases when pure water is added

Based on this reaction, find how many moles of co can be obtained starting with 7 mol ch4?

A compound has a formula mass of 61.98 amu and is comprised of atoms of sodium and oxygen in a definite ratio. the name of the compound described here is

Determine the mole fraction of the solute if you have 3.4 grams KCl in 8.1 grams H2O A) 0.092 B) 0.420 C) 0.101 D) 0.63

When filling degenerate orbitals, electrons fill them singly first, with parallel spins is known as When filling degenerate orbitals, electrons fill them singly first, with parallel spins is known as: A. Hund's rule B.

How much energy must be supplied to break a single 21ne nucleus into separated protons and neutrons if the nucleus has a mass of 20.98846 amu?

How many moles of solute are contained in a 250 ml solution that has a concentration of. 85 m? A) 210 B) 0.21 C) 3.4 D) 0.29 E) 0.85

Classify the bonds formed between each pair as ionic, polar covalent, or nonpolar covalent based solely on each element's position on the periodic table. O-O, Fe-O, Al-N, O-I, S-I, Br-Br, P-Br, Be-Cl

If one starts with pure NO2 (g) at a pressure of 0.500 atm, the total pressure inside the reaction vessel when 2NO2 (g) 2NO (g) + O2 (g) reaches equilibrium is 0.674 atm. Calculate the equilibrium partial pressure of NO2.