Last night’s homework:

Problems 4-6 on page 282 Questions 7-11 on page 283

Write chemical equations for each of the following reactions.

4. In water, iron(III) chloride reacts with sodium hydroxide, producing solid iron(III) hydroxide and sodium chloride.

4. In water, iron(III) chloride reacts with sodium hydroxide, producing solid iron(III) hydroxide and sodium chloride.

4. In water, iron(III) chloride reacts with sodium hydroxide, producing solid iron(III) hydroxide and sodium chloride.

FeCl 3 + NaOH → Fe(OH) 3 + NaCl

4. In water, iron(III) chloride reacts with sodium hydroxide , producing solid iron(III) hydroxide and sodium chloride.

FeCl 3 + NaOH → Fe(OH) 3 + NaCl

4. In water, iron(III) chloride reacts with sodium hydroxide , producing solid iron(III) hydroxide and sodium chloride.

FeCl 3 + NaOH → Fe(OH) 3 + NaCl

4. In water, iron(III) chloride reacts with sodium hydroxide, producing solid iron(III) hydroxide and sodium chloride.

FeCl 3 + NaOH → Fe(OH) 3 + NaCl

4. In water, iron(III) chloride reacts with sodium hydroxide, producing solid iron(III) hydroxide and sodium chloride.

FeCl 3 + NaOH → Fe(OH) 3 + NaCl

4. In water, iron(III) chloride reacts with sodium hydroxide, producing solid iron(III) hydroxide and sodium chloride .

FeCl 3 + NaOH → Fe(OH) 3 + NaCl

4. In water, iron(III) chloride reacts with sodium hydroxide, producing solid iron(III) hydroxide and sodium chloride .

FeCl 3 + NaOH → Fe(OH) 3 + NaCl

FeCl 3 + NaOH → Fe(OH) 3 + NaCl

FeCl 3 + NaOH → Fe(OH) 3 + NaCl Fe Cl Na O H Fe Cl Na O H

FeCl 3 + NaOH → Fe(OH) 3 + NaCl Fe 1 Cl 3 Na 1 O 1 H 1 Fe 1 Cl 1 Na 1 O 3 H 3

FeCl 3 + NaOH → Fe(OH) 3 + NaCl Fe 1 Cl 3 Na 1 O 1 H 1 Fe 1 Cl 1 Na 1 O 3 H 3

FeCl 3 + NaOH → Fe(OH) 3 + 3 NaCl Fe 1 Cl 3 Na 1 O 1 H 1 Fe 1 Cl 1 Na 1 O 3 H 3

FeCl 3 + NaOH → Fe(OH) 3 + 3 NaCl Fe 1 Cl 3 Na 1 O 1 H 1 Fe 1 Cl 3 Na 3 O 3 H 3

FeCl 3 + NaOH → Fe(OH) 3 + 3NaCl Fe 1 Cl 3 Na 1 O 1 H 1 Fe 1 Cl 3 Na 3 O 3 H 3

FeCl 3 + 3 NaOH → Fe(OH) 3 + 3NaCl Fe 1 Cl 3 Na 1 O 1 H 1 Fe 1 Cl 3 Na 3 O 3 H 3

FeCl 3 + 3 NaOH → Fe(OH) 3 + 3NaCl Fe 1 Cl 3 Na 3 O 3 H 3 Fe 1 Cl 3 Na 3 O 3 H 3

FeCl 3 + 3NaOH → Fe(OH) 3 + 3NaCl Fe 1 Cl 3 Na 3 O 3 H 3 Fe 1 Cl 3 Na 3 O 3 H 3

5. Liquid carbon disulfide reacts with oxygen gas, producing carbon dioxide gas and sulfur dioxide gas.

5. Liquid carbon disulfide reacts with oxygen gas, producing carbon dioxide gas and sulfur dioxide gas.

CS

2

+ O

2 →

CO

2

+ SO

2

CS

2

+ O

2 →

CO

2

+ SO

2

C O S

CS

2

+ O

2 →

CO

2

+ SO

2 C O S

C 1 O 2 S 2

CS

2

+ O

2 →

CO

2

+ SO

2 C 1 O 4 S 1

CS

2

+ O

2 →

CO

2

+

2

SO

2 C 1 O 2 S 2 C 1 O 4 S 1

CS

2

+ O

2 →

CO

2

+

2

SO

2 C 1 O 2 S 2 C 1 O 6 S 2

CS

2

+

3

O

2 →

CO

2

+

2

SO

2 C 1 O 2 S 2 C 1 O 6 S 2

CS

2

+

3

O

2 →

CO

2

+

2

SO

2 C 1 O 6 S 2 C 1 O 6 S 2

CS

2

+ 3O

2 →

CO

2

+ 2SO

2 C 1 O 6 S 2 C 1 O 6 S 2

6. Solid zinc and aqueous hydrogen sulfate react to produce hydrogen gas and aqueous zinc sulfate.

6. Solid zinc and aqueous hydrogen sulfate react to produce hydrogen gas and aqueous zinc sulfate.

Zn + H

2

SO

4 →

H

2

+ ZnSO

4

Zn H S O

Zn + H

2

SO

4 →

H

2

+ ZnSO

4 Zn H S O

Zn + H

2

SO

4 →

H

2

+ ZnSO

4 Zn 1 H 2 S 1 O 4 Zn 1 H 2 S 1 O 4

7. List three types of evidence that a chemical reaction has occurred.

7. List three types of evidence that a chemical reaction has occurred.

• •

Changes in: Temperature Color

• • •

Appearance of: Odor Gas bubbles Solid precipitate

8. Compare and contrast a skeleton equation and a chemical equation.

8. Compare and contrast a skeleton equation and a chemical equation.

Both show formulas of reactants and products.

Chemical equation also shows relative amounts.

9. Why is it important that a chemical equation be balanced?

9. Why is it important that a chemical equation be balanced?

Mass is neither created nor destroyed.

10. When balancing a chemical equation, can you adjust the number that is subscripted to a substance formula?

10. When balancing a chemical equation, can you adjust the number that is subscripted to a substance formula?

No

10. When balancing a chemical equation, can you adjust the number that is subscripted to a substance formula?

No H

2

O → H

2

+ O

2

10. When balancing a chemical equation, can you adjust the number that is subscripted to a substance formula?

No H

2

O → H

2

H

2

O

2

→ H

2

+ O

2

+ O

2

11. Why is it important that to reduce the coefficients in a balanced equation to the lowest possible whole-number ratio?

11. Why is it important that to reduce the coefficients in a balanced equation to the lowest possible whole-number ratio?

Clearly shows the relative amounts.

.