Do electrons fill up the lowest or highest level

Of the reactions below, which one is a double-replacement reaction? A. NH4Cl - > NH3 + HCl B. 2 Mg + O2 - > 2 MgO C. 2 N2 + 3 H2 - > 2 NH3 D. Cd (NO3) 2 + Na2S - > CdS + 2 NaNO3

How many atoms of H are in 93.2 grams of PH3?

A 1.345-g sample of a compound of barium and oxygen was dissolved in hydrochloric acid to give a solution of barium ion, which was then precipitated with an excess of potassium chromate to give 2.012 g of barium chromate, BaCrO4.

Which atom is more reactive, sodium or sulfur, why

Which branch of science provide the proof that earth is approximately 4.6 billion years old

What happens to a reactant molecules when forming product molecules

Which is the atomic number of an atom with six valence electrons

O2 + CS2 → CO2 + SO2 Which of the following shows the equation balanced?

Convert 970. mm Hg to atm.

The addition of a catalyst in a chemical reaction (A) increases the concentration of products at equilibrium. (B) increases the fraction of reactant molecules with a given kinetic energy.