Calculate the wavelength, in nanometers, of the spectral line produced when an electron in a hydrogen atom undergoes the transition from the energy level n = 5 to the level n = 2.

Why is atomic number better than atomic mass for organizing the elements in the periodic table?

7.02 CaO (s) + H2O (l) → Ca (OH) 2 (s) : ΔH = - 65.2 kJ Which statement about the reaction between calcium oxide and water is correct? 65.2 kJ of heat are released for every mole of CaO that reacts.

Often causes slow movements and loss of sense of balance.

In the graph, which two regions show the particle undergoing zero acceleration and negative acceleration respectively? A. BC shows zero acceleration, and AB shows negative acceleration. B.

If the pH is 3.94 what is the concentration of H

Benzene, C6H8, has an enthalpy of fusion = 10.19 kJ/mol. Calculate the amount of energy which is needed to change 88.0 g of solid benzene at 5.53°C into liquid benzene, also at 5.53°C?

What is the H3O + ion concentration of a solution that has an OH - ion concentration of 1.0 * 10^-3M? A) 1.0 * 10^-3M B) 1.0 * 10^-7M C) 1.0 * 10^-11M D) 1.0 * 10^-14M

Given the following chemical reaction: 2 O2 + CH4 CO2 + 2 H2O In the reaction of 6 moles of CH4 with excess oxygen, how many moles of water could be produced? 6 C 12.01 Carbon 1 H 1.01 Hydrogen 8 O 16.00 Oxygen A. 4 B. 6 C. 8 D. 12

Most mutagens have what kind of an effect on an organism?

According to the hess's law, the enthalpy of solution is: δhsoln = δhsolute + δhsolvent + δhmix. considering dissolving a small drop of nonpolar pentane oil in water which term (s) in the equation will experience the largest enthalpy change.