Chemistry and Solutions for Nursing School Entrance Exam Practice Problems

The study guide for these practice questions can be found at:

Chemistry and Solutions for Nursing School Entrance Exam Study Guide

Questions

1. In a dilute solution of sodium chloride in water, the sodium chloride is the
   1. solvent.
   2. solute.
   3. precipitate.
   4. reactant.
2. To prepare 100 ml of 0.20 M NaCl solution from stock solution of 1.00 M NaCl, you should mix
   1. 20 ml of stock solution with 80 ml of water.
   2. 40 ml of stock solution with 60 ml of water.
   3. 20 ml of stock solution with 100 ml of water.
   4. 25 ml of stock solution with 75 ml of water.
3. How many grams of NaOH would be needed to make 250 ml of 0.200 M solution? (molecular weight of NaOH = 40.0)
   1. 8.00 g
   2. 4.00 g
   3. 2.00 g
   4. 2.50 g
4. The number of moles of NaCl in 250 ml of a 0.300 M solution of NaCl is
   1. 0.0750
   2. 0.150
   3. 0.250
   4. 1.15
5. Which of the following properties of water is not dependent on the polar nature of water?
   1. color
   2. high boiling point
   3. solvent power
   4. high heat of vaporization
6. A substance has the formula MgSO₄ × 7H₂O. How many grams of water are in 5.00 moles of this substance?
   1. 7.00
   2. 35.0
   3. 126
   4. 630
7. How many grams of sugar are needed to make 500 ml of a 5% (weight/volume) solution of sugar?
   1. 20
   2. 25
   3. 50
   4. 10
8. Which of the following types of bonds forms when a hydrogen atom binds to a highly electronegative atom and also partially binds to another atom?
   1. coordinate covalent bond
   2. hydrogen bond
   3. ionic bond
   4. covalent bond
9. Which of the following is NOT true of a solution?
   1. Each component of a solution retains its original properties.
   2. A solution is a heterogeneous mixture.
   3. A solution is composed of a solute and solvent.
   4. A solution involves two or more pure substances.
10. Which of the following is NOT a factor that affects solubility?
    1. temperature
    2. pressure
    3. particle size
    4. properties of the solvent

Answers

1. b.   The substance being dissolved is the solute, by definition.
2. a.   You need 20 ml of stock solution; you would fill the container with water to the 100 ml mark (80 ml H₂O).

M_i × V_i = Mf × V_f

1.0 M × V_i = 0.2 M × 100 ml

1.0 V_i = 20



3. c.   250 ml × = 0.05 mol; 0.05 moles × 40 g = 2.00 g
4. a.   250 ml × = 0.0750 mol
5. a.   The other properties listed are due to the polar nature of water.
6. d.   There are 5 moles of MgSO₄ × 7H₂O. There are 7 moles of water of MgSO₄ × 7H₂O; 7 × 5 = 35 moles; 35 × 18 g = 630 g.
7. 





25 g = x

8. b.   Hydrogen atoms are capable of forming a partial bond between a highly electronegative atom and another atom.
9. b.   A solution is a homogeneous mixture.
10. c.   Temperature, pressure, and the properties of the solvent all affect solubility.