N/A — Exam Answers

Which is an example of ionization?

The molar mass of NaOH is 40 point 0 0 g/mol If 5 point 2 0 g NaOH are dissolved in 0 point 5 0 0 liters of solution, what is the molarity of the solution? Use molarity is equal to moles of solute over liters of solution

Which is the formula mass of Na sub 2 SO sub 4 ?

An experimental procedure requires 10 ml of acid to be dissolved into a beaker of water. An additional 5 ml of acid is added to the solution. Which statement best describes the new solution?

Which statement best describes what makes a base weak?

The chemical equation for the combustion of acetylene open paren cap c sub 2 cap h sub 2 close paren is given. 2 cap c sub 2 cap h sub 2 g plus 5 cap o sub 2 g rightarrow 4 CO sub 2 g plus 2 cap h sub 2 cap o g What volume of oxygen at STP is required for the complete combustion of 100 point 5 0 milliliters of cap c sub 2 cap h sub 2 ?

Consider the combustion reaction, 2 cap c sub 4 cap h sub 2 g plus 5 cap o sub 2 g rightarrow 4 CO sub 2 g plus 2 cap h sub 2 cap o g where cap c sub 2 cap h sub 2 , Δ⁢H_f=227.4kJ/mol , CO sub 2 , Δ⁢H_f=−393.5kJ/mol , and cap h sub 2 cap o , Δ⁢H_f=−241.82kJ/mol What is the enthalpy of the reaction? Use Δ⁢H_rxn=∑(Δ⁢H_f_1p⁢r⁢o⁢d⁢u⁢c⁢t⁢s)−∑(Δ⁢H_f_1r⁢e⁢a⁢c⁢tan⁡t⁢s)

In an experiment, a student wants to increase the rate of a reaction that involves gases. Which change to the reactants would accomplish this?

Catalysts are used in the oil industry to increase octane ratings in gasoline. Octane ratings tell how much fuel has to be compressed to promote better fuel ignition in some cars. Which of these catalytic effects would be most beneficial for the oil industry?

Which statement best describes the diagram?