Test 8 Review

The pH of a solution is 8.43. What is the [H₃O⁺]concentration?

• 3.7 x 10 ^-9

• 1.0 x 10^-8.43

• 2.7 x 10^-6

• 1.0 x 10^-14

If the [OH^-] of a solution is 2.7 x 10^-4 M, the pOH of the solution is

• 10.44

• 1.00

• 3.57

• -4.43

*A 0.050L solution of Ba(OH)₂ is neutralized by 0.072 L of a 0.55 M HNO₃ solution. What is the concentration of the Ba(OH)₂ solution?

• 2 M.0

• 0.40 M

• 1.2 M

• None of the above

A 0.025L solution of HCl is neutralized by 0.018L of a 1.0 M NaOH solution. What is the concentration of the HCl solution?

• 1.4 M

• 4.0 M

• 0.72 M

• None of these

Increase in temperature of the reactants can do one of the following

• Slow collision frequency
• Allow less effective collision between the particles
• Neutralise the reaction
• increase collision between the particles thus increasing the rate.

To slow down a chemical reaction you will do one of the following:

• Place the reactants in hot water
• Crush the reactants

• Place the reactants in a ice bath
• Keep stirring the reactants with a stirring rod

Which one of the following is NOT a key concept of the collision theory:

• particles must collide in order to react

• particles must move slowly when they collide, otherwise they simply “bounce off” one another

• particles must collide with the proper orientation

• particles must collide with sufficient energy to reach the activated complex in order to react

What is the ΔH of this reaction?

• 40 kJ

• 20 kJ

• 80 kJ

• -60 kJ

What is the energy of the activated complex?

• 75 kJ
• 225 kJ
• 300 kJ
• 225 kJ

What is the activation energy?

• 40 kJ
• 20 kJ
• 100 kJ
• 60 kJ