POST UTME ACHIEVERS UNIVERSITY 2017 Chemistry | Objective
Practice these randomly selected questions to test your readiness.
Question 1
The enthalpy change (ΔH) for the reaction: 2H2(g) + O2(g) -> 2H2O(l) is -572 kJ/mol. Calculate the enthalpy change for the reaction: H2(g) + 1/2O2(g) -> H2O(l).
Question 2
The s\tandard enthalpy of formation of CO2(g) is -393.5 kJ/mol. Calculate the s\tandard enthalpy of combustion of 1.5 mol of C(s) to form CO2(g).
Question 3
A 1.00-L sample of a solution containing 0.100 M NaCl is mixed with 1.00 L of a solution containing 0.100 M NaOH. What is the concentration of the resulting solution?
Question 4
A sample of a solid is heated to 100°C and then cooled to 0°C. The resulting solid has a melting point of 100°C.
Question 5
The diagram below shows a molecular structure.
Question 6
A 1.00-L sample of a solution containing 0.100 M NaCl is mixed with 1.00 L of a solution containing 0.100 M NaOH. What is the concentration of the resulting solution?
Question 7
A 0.5 M solution of HCl is mixed with a 0.5 M solution of NaOH. The reaction is carried out in a calorimeter. If the temperature of the solution increases by 5°C, what is the value of ΔH for the reaction?
Question 8
The s\tandard enthalpy of formation of CO2(g) is -393.5 kJ/mol. Calculate the s\tandard enthalpy of combustion of 1.5 mol of C(s) to form CO2(g).
Question 9
A 0.5 M solution of HCl is mixed with a 0.5 M solution of NaOH. The reaction is carried out in a calorimeter. If the temperature of the solution increases by 5°C, what is the value of ΔS for the reaction?
Question 10
The s\tandard enthalpy of formation of H2O(l) is -285.8 kJ/mol. Calculate the s\tandard enthalpy of vaporization of 1 mol of H2O(l) at 100°C.
Question 11
A 1.00-L sample of a solution containing 0.100 M NaCl is mixed with 1.00 L of a solution containing 0.100 M NaOH. What is the concentration of the resulting solution?
Question 12
The atomic radius of an element is the dis\tance from the nucleus to the outermost electron. Which of the following elements has the largest atomic radius?
Question 13
A 2.5 M solution of sodium hydroxide (NaOH) is prepared by dissolving 12.5 g of NaOH in 1 L of water. What is the molarity of the solution?
Question 14
A polymer is a large molecule composed of many repeated subunits called monomers. Which of the following is an example of a polymer?
Question 15
A colloidal solution of silver is prepared by the reduction of silver nitrate with sodium citrate. The resulting particles have a diameter of 10 nm.
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