A Bohr model of an atom of hydrogen is shown in the figure. Which transition(s) depicted by arrows result in energy emission, found as a line in the atomic emission spectrum?  

How much time (in seconds) is needed to deposit 0.0125 g of chromium from a solution of Cr(NO3)3 with a current of 1.50 A? The molar mass of chromium is 52.00 g/mol.  

What isotope is depicted in the figure?      

Which set of quantum numbers is correct and consistent with n = 3?

A mixture is made of 100.0 mL of water and 1.0 g of silver chloride, AgCl.  What does this solution look like and what mass of silver chloride is in the solution? The molar solubility of AgCl is 1.3×10–5 and the molar mass is 143.32 g/mol.

The formation of hydrazine, N2H4, is: N2(g) + 2H2(g) ⇌ N2H4(l) This reaction has the energy diagram shown. Which change will increase the value of K?

What is the equilibrium expression for the reaction below? 2Fe(s) + 3CO2(g)  ⇌ Fe2O3(s) + 3CO(g)

Which condition(s) will increase the concentration of dissolved oxygen (O2) in water? decrease the temperature of the solution. increase the total external pressure on the solution by adding more N2 gas

What are the Brønsted-Lowry acids in this reaction? NH3(aq) + H2O(l) ⇌ NH4+(aq) + OH–(aq)

A first-order decay process for a radioactive isotope is shown below. Which figure shows the composition at 12 years?