Which formula represents a polar molecule?

(1) O2

(2) CO2

(3) NH3

(4) CH4

The minimum amount of energy necessary to start a chemical reaction is activation energy kinetic energy enthalpy entropy

2H2S (g) ⇌2H2 (g) + S2 (g), Kc=1.67*10-7 at 800∘C is carried out at 800 ∘C with the following initial concentrations: [H2S]=0.100M, [H2]=0.100M, and [S2]=0.00 M. Find the equilibrium concentration of S2.

Which element is shiny and silver colored and compounded with sulfur is bright red

Choose the Brønsted-Lowry acids and bases in the following equation: HCN + OH=H2O + CNC A) acids HCN, CNº bases OH, H20 B) acids CN, OH bases HCN, H2O C) acids HCN, H20 bases OH", CN D) acids OH", H20 bases CN", HCN E) acids HCN, OH bases H20, CN

When 1.57 mol o2 reacts with h2 to form h2o, how many moles of h2 are consumed in the process?

Write the equilibrium constant: Pb3 (PO4) 2 (s) = 3Pb2 + (aq) + 2PO2 (aq)

How many orbitals are there in the shell with n = 4?

Using the balanced equation shown below, calculate the mass of c3h8 that must react in order to release 2.45*106 * 106 kj of heat. δhrxn = - 2219.9 kj

True or False Aluminum does not perform well at elevated temperatures

What is its pressure if its volume is changed to 10.1 L? Express your answer using two significant figures.