SAT Subject Test Chemistry

PART 2

REVIEW OF MAJOR TOPICS

CHAPTER 6

Stoichiometry (Chemical Calculations) and the Mole Concept

Practice Exercises

Often there are some equations on a chemistry test to either complete or complete and balance. The following list includes representative equations that you should be capable of completing and balancing:

1. zinc + sulfuric acid →

2. iron(III) chloride + sodium hydroxide → iron(III) hydroxide(s) + sodium chloride

3. aluminum hydroxide + sulfuric acid → aluminum sulfate + water

4. potassium + water →

5. magnesium + oxygen →

6. silver nitrate + copper → copper(II) nitrate + silver(s)

7. magnesium bromide + chlorine → magnesium chloride + bromine

Answers and Explanations

Below the word equations are the complete balanced equations.

1. zinc + sulfuric acid → zinc sulfate + hydrogen(g)
Zn + H2SO→ ZnSO+ H2(g)

2. FeCl+ 3NaOH → Fe(OH)3(s) + 3NaCl

3. 2Al(OH)+ 3H2SO→ Al2(SO4)+ 6H2O

4. potassium + water → potassium hydroxide + hydrogen(g)
2K + 2H2O → 2KOH + H2(g)

5. magnesium + oxygen → magnesium oxide
2Mg + O→ 2MgO

6. 2AgNO+ Cu → Cu(NO3)+ 2Ag(s)

7. MgBr+ Cl→ MgCl+ Br2