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# Chemistry and Chemical Equations for Nursing School Entrance Exam Practice Problems

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Updated on Aug 12, 2011

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

Chemistry and Chemical Equations for Nursing School Entrance Exam Study Guide

### Questions

1. The molecular weight (in amu) of aluminum carbonate, Al2(CO3)3, is
1. 55
2. 114
3. 234
4. 201
2. The formula of carbon dioxide is CO2. Its molecular weight is 44 amu. A sample of 11 grams of CO2 contains
1. 1.0 mole of carbon dioxide.
2. 1.5 grams of carbon.
3. 3.0 grams of carbon.
4. 6.0 grams of oxygen.
3. How many grams are contained in 0.200 mol of calcium phosphate, Ca3(PO4)2?
1. 6.20
2. 62.0
3. 124
4. 31.0
4. The symbol 5 O2 signifies
1. 5 atoms of oxygen.
2. 80 grams of oxygen.
3. 160 grams of oxygen.
4. 5 grams of oxygen.
5. In the reaction CaCl2 + Na2CO3 → CaCO3 + 2NaCl, if 0.5 mole of NaCl is to be formed,
1. 1 mole of Na2CO3 is needed.
2. 0.5 mole of CaCO3 is also formed.
3. 0.5 mole of Na2CO3 is needed.
4. 0.25 mole of CaCl2 is needed.
6. In the reaction 2Cu2S + 3O2 → 2Cu2O + 2SO2, if 24 moles of Cu2O are to be prepared, then how many moles of O2 are needed?
1. 24
2. 36
3. 16
4. 27
7. Which of the following equations is balanced?
1. 2H2O2 → 2H2O + O2
2. Ag + Cl2 → 2AgCl
3. KClO3 → KCl + O2
4. Na + H2O → NaOH + H2
8. Butane (C4H10) burns with oxygen in the air according to the following equation:
9. 2C4H10 + 13O2 → 8CO2 + 10H2O.

In one experiment, the supply of oxygen was limited to 98.0 g. How much butane can be burned by this much oxygen?

1. 15.1 g C4H10
2. 27.3 g C4H10
3. 54.6 g C4H10
4. 30.2 g C4H10
10. What type of chemical equation is 2NH3 → N2 + 3H2?
1. combination reaction
2. decomposition reaction
3. single displacement reaction
4. double displacement reaction
11. Which of the following equations is balanced?
1. Mg + N2 → Mg3N2
2. Fe + O2 → Fe2O3
3. C12H22O11 → 12C + 11H2O
4. Ca + H2O → Ca(OH)2 + H2

1. c.   There are 2 atoms of Al; 3 atoms of C; and 9 atoms of O. Look at the atomic weights in the periodic table:
2. 2 × Al = 2 × 27 = 54 amu

3 × C = 3 × 12 = 36 amu

9 × O = 9 × 16 = 144 amu

Then add them up to get the formula weight, which is 234 amu.

3. c.
4. b.
5. c.
6. d.  l; One mole of CaCl2 would be needed to get 2 mol NaCl. Since 0.5 mol of NaCl, or 25% of 2 moles, is to be formed, 0.25 mol CaCl2 (25% of 1 mole) is needed.
7. b.
8. a.   There are 4 H in the reactants and 4 H in the products, and 4 O in the reactants and 4 O in the products.
9. b.   Normally, 2 moles of C4H10 react with 13 moles of O2. The supply of oxygen is limited to 98 g, or 3.06 moles;
10. b.   A decomposition reaction takes the form C → A + B.
11. c.   There are 12 C on both sides, 22 H on both sides, and 11 O on both sides.