When elements with four electrons in the outermost shell react chemically, they

A. Always gain 4 electrons

B. Always lose 4 electrons

C. May lose, gain, or share 4 electrons

D. May lose or gain 4 electrons

Describe a situation where bacteria would be desirable/undesirable

A pure substance is found to be a good conductor of electricity in both its solid and liquid phases. The bonding in the substance is which one of the following? (a) ionic (b) covalent molecular (c) metallic (d) covalent network

How many moles of sodium atoms are contained in 3.5 moles of sodium sulfide

Describe, in detail, how to make 2.0 liters of a 1.0 molar HCl solution from a 12.5 molar HCl stock solution.

A solution contains 0.115 mol h2o and an unknown number of moles of nacl. the vapor pressure of the solution at 30°c is 25.7 torr. the vapor pressure of pure water at 30° c is 31.8 torr. calculate the number of moles of nacl

Determine the number of moles of sulfur trioxide produced when 3.5 moles of oxygen gas is consumed in the reaction

For each of the following balanced oxidation-reduction reactions, (i) identify the oxidation numbers for all the elements in the reactants and products and (ii) state the total number of electrons transferred in each reaction. 1.

Hypervitaminosis is a serious health threat associated with excessive amounts of ingested fat-soluble vitamins. why do water-soluble vitamins not commonly pose the same threat?

Hydrogen is an element with two naturally occurring isotopes: 2 H and 3 H. This means that 2 H, which has a mass number of 2, has fewer than 3 H, which has a mass number of 3. True/False

C₂H₂ + O2 - CO₂ + H₂ How many moles of oxygen are necessary to react completely with 4.0 moles of propane (CH) ?