What is the number after an elements name, representing the sum of its protons and neutrons

Illustrate the phases in a homogeneous solution. A) Both solute and solvent are in the same phase in a homogeneous solution. Eliminate B) In a homogeneous solution, the solute and solvent are in different phases.

Consider the reaction: 8H2S (g) + 4O2 (g) →8H2O (g) + S8 (g) Δ[H2S]/Δt = - 0.085 M/s. Δ[H2O]/Δt

A piston contains 5.00 L of gas at a pressure of 101 kPa. The piston is compressed until the gas occupies 2.00 L of space. What is the new pressure of gas inside the piston?

Which reaction will produce a solution that does not conduct electricity? A. CH3OH (l) CH3OH (aq) B. CaBr2 (s) Ca2 + (aq) + 2Br (aq) C. HF (g) + H2O (l) H3O + (aq) + F - (aq) D. NH3 (g) + H2O (l) NH4 + (aq) + OH - (aq)

What is the molar mass of a compound if 25.0 g of the compound dissolved in 750. Ml gives a molarity of 0.290 m?

The volume, in liters, of 538 g of CO2

9.86 x 10²⁸ O-atoms require what volume (L) N₂O₂ at STP?

What is a group of elements that form salts called

Which number represents an acidic pH, 4 or 9?

What would make the risk of these cancers even worse for someone who drinks alcohol?