CHM 2045C Name: _________________

Module 5i Homework Packet-Jespersen 7th

 

Module Five Part I:Chemical Equations & Stoichiometry (Chap 3-4)

E._____(03) Basic Reaction Symbols-Chapter 3 Section 3.1 Answers ef

E1.____(02) Classifying Chemical Reactions- Section 3.1-Lecture

F._____(05) Balancing Chemical Equations -Sections 3.1 Answers ef

G._____(05) Predicting Single Replacement Products Sections 4.8 Answers

H._____(05) Predict Double Replacement Sections 4.1, 4.3, 4.5 Answers h

H1____ (05) Neutralization/Gas Forming Reactions Section 3.8-3.9-4.5 Lecture Answers

______(25) Total = ______%

 

M-5i Required Homework:

______(30) M-5i Pretest Hardcopy Homework Packet

______(30) M-5i Multiple Choice (MC) Homework/Exam (Blackboard Online)

 

Evidence for Chemical Reactions

 

There are four observations that indicate a chemical reaction is taking place:

 

1.      A gas is produced.

Gas may be observed in many ways in a reaction from light fizzing to heavy bubbling.

 

2.      An insoluble solid is produced in a solution.

a.    A substance dissolves in water to give an aqueous solution.

b.    If we add two aqueous solutions together, we may observe the production of a solid substance.

c.    The insoluble solid formed is called a precipitate

 

3.      A permanent color change is observed.

a.    Many chemical reactions involve a permanent color change.

b.    A change in color indicates that a new substance has been formed

 

4.      An energy change is observed

a.    A reaction that releases heat is an exothermic reaction.

b.    A reaction that absorbs heat is an endothermic reaction.

c.    Examples of a heat energy change in a chemical reaction are heat and light being given off.

 

 

 

 

Module Five-Part E Basic Stoichiometry Definitions 3 points

 

 

 

 

 

 

 

 

 

CHM 2045C Module Five I Homework Packet

Module Five-Part E Basic Stoichiometry Definitions 3 points

 

Fill in the following with the symbols used in chemical equations which has the stated translation or meaning(s) :

 

 

_________1. Produces, yields, gives

 

 

_________2. Reacts with, added to, plus

 

 

_________ and _________ 3. Solid substance or precipitate forms

 

 

_________and _________4. Gaseous substance formed

 

 

_________5. Liquid Substance

 

 

________5a. Water or aqueous solution

 

 

_________6. Reversible Reaction

 

 

_________7. No Reaction

 

 

 

8. Show the symbol for heat:__________

 

 

9. How would you show a catalyst in a chemical reaction where A plus B forms products D and E, but is catalyzed by substance C

 

 

A + B D + E

 

10. Define Catalyst (See Section 7.2 page 191)

 

Reference:

Jespersen 7th Chapter 3 Section 3.1

 

 

M-5i Homework Packet

Module 5 E1: Classification of Chemical Reactions 2 Points

(Sections 3.1)

 

 

Classify Each of the following (unbalanced) chemical reactions as:

  1. Combination (or synthesis)
  2. Decomposition (or Anaylsis)
  3. Single Replacement
  4. Double Replacement (Precipitation)
  5. Double Replacement (Neutralization)
  6. Double Replacement (Gas Forming)

 

______1. Fe + FeCl3 FeCl2

 

____2. HCl + Mg(OH)2 MgCl2 + HOH

 

_____3. Mg + HNO3 Mg(NO3)2 + H2

 

_____4. H2 + N2 NH3

 

____5. NaHCO3 + HCl NaCl + CO2 + H2O

 

____6. Ca(NO3)2 + K3PO4 Ca3(PO4)2 + KNO3

 

____7. KClO3 KCl + O2

 

____8. Na + H2O NaOH + H2

 

 

 

M-5i Homework Packet

 

Reference:

Jespersen 7th Chapter 3 Section 3.1

 

Writing Chemical Reactions (Section 3.1) 1 point

 

9. Write a chemical equation or solid cadmium hydrogen carbonate decomposing to yield solid cadmium carbonate, water, and carbon dioxide gas:

 

 

 

10. Write a chemical equation for the reaction of aqueous solutions of potassium chromate and calcium sulfate to give the precipitate calcium chromate and aqueous potassium sulfate.

M-5i Homework Packet

 

Reference: McMurry: Section 3.1

 

Module Five-Part F Balancing Chemical Equations 5 points

 

 

 

M-5i Homework Packet

Module Five-Part F Balancing Chemical Equations 5 points

 

Balance the following chemical equations (write the chemical formulas in #10 then balance):

 

1. Fe + FeCl3 FeCl2

 

 

2. Al + O2 Al2O3

 

 

3. Na2CO3 + C + N2 NaCN + CO

 

 

4. FeS + O2 Fe2O3 + SO2

 

 

5. IBr + NH3 NI3 + NH4Br

 

 

 

6. Cl2 + HOH HCl + HClO

 

 

 

7. AgNO3 AgNO2 + O2

 

 

 

8. HClO4 + P4O10 H3PO4 + Cl2O7

 

 

 

9. HCl + Mg(OH)2 MgCl2 + HOH

 

 

 

10. Sodium hydroxide + Hydrochloric acid sodium chloride + water

 

 

 

Reference:

Jespersen 7th Chapter 3 Section 3.1

 

 

M-5i Homework Packet

Module Five-Part F Balancing Chemical Equations

 

 

 

 

 

 

 

 

 

M-5i Homework Packet

Module Five-Part F Balancing Chemical Equations Continued

Reference: McMurry: Chapter 3 Section 3.1

You may check your work using the online chemical equation balancer at: http://people.emich.edu/bramsay1/ccc-release/chem.html

Reference:

Jespersen 7th Chapter 3 Section 3.1


M-5i Homework Packet

Part G Single Replacement Reactions 5 points

 

Given the following Activity Series:

Li > K > Ba > Sr > Ca > Na > Mg > Al > Mn > Zn > Fe > Cd > Co > Ni >

Sn > Pb > (H) > Cu > Ag > Hg > Au

 

Given the following Active Metals:

Li > K > Ba > Sr > Ca > Na

 

 

 

 

 

M-5i Homework Packet

Part G Single Replacement Reactions

 

 

 

 

M-5i Homework Packet

Part G Single Replacement Reactions

 

 

If you were to (H2O) in the activity series like an acid is shown as (H), where would you put it? Show below:

 

Given the following Activity Series:

 

Li > K > Ba > Sr > Ca > Na > Mg > Al >

Mn > Zn > Fe > Cd > Co > Ni > Sn >

 

Pb > (H) > Cu > Ag > Hg > Au

 

 

 

 

 

M-5i Homework Packet

Part G Single Replacement Reactions 5 points

 

Given the following Activity Series:

Li > K > Ba > Sr > Ca > Na > Mg > Al > Mn > Zn > Fe > Cd > Co > Ni >

Sn > Pb > (H) > Cu > Ag > Hg > Au

 

Given the following Active Metals:

Li > K > Ba > Sr > Ca > Na

 

 

Complete the products of the following reactions, then balance the equation (If no reaction write NR):

 

1. Cu (s) + Al(NO3)3 (aq)

 

 

 

 

 

2. Al (s) + Cu(NO3)2 (aq)

 

 

 

 

 

3. Au (s) + H2SO4 (aq)

 

 

 

 

 

4. Ca (s) + H2O (l)

 

 

 

 

 

5. Mn (s) + H2O (l)

 

 

Reference:
Jespersen 7th Sections 4.8

 

M-5i Homework Packet

 

 

Part H Double Replacement Reactions 5 points

Given the following Solubility Rules for Ionic Compounds:

Compounds containing the following ions are generally soluble in water:

1. Alkali metal ions and ammonium ions, Li+ , Na+ , K+ , NH4+

2. Acetate ion, C2H3O2-

3. Nitrate ion, NO3-

4. Halide ions (X), Cl- , Br- , I- (AgX, Hg2X2 , and PbX2 are insoluble exceptions)

5. Sulfate ion, SO4 2- (SrSO4, BaSO4 , and PbSO4 are insoluble exceptions)

 

Compounds containing the following ions are generally insoluble in water:

6. Carbonate ion,CO32- (see rule 1 exceptions which are soluble)

7. Chromate ion CrO42- (see rule 1 exceptions which are soluble)

8. Phosphate ion PO43- (see rule 1 exceptions which are soluble)

9. Sulfide ion, S2- (CaS, SrS, BaS, and rule 1 exceptions are soluble in water)

10. Hydroxide ion, OH- [ Ca(OH)2 , Sr(OH)2 , Ba(OH)2 , and rule 1 exceptions are soluble)

 

Complete and balance the following reactions using the above solubility table (write no reaction or NR if both products are soluble or a covalent compounds is not formed)

 

1. AlCl3 (aq) + K2CO3 (aq)

 

 

 

 

2. NiSO4 (aq) + Li3PO4 (aq)

 

 

 

 

3. NaCl (aq) + AgNO3 (aq)

 

 

 

 

4. H2SO4 (aq) + NaOH (aq)

 

 

 

 

5. H3PO4 (aq) + Ba(OH)2 (aq)

 

 

 

Reference:
Jespersen 7th:
Sections 4.1, 4.3, 4.5

 

 

 

M-5i Homework Packet

Part H1 Double Replacement Reaction:

Neutralization/Gas Forming Reactions 5 points

 

Complete and balance the following precipitation reactions using the above solubility table

(write no reaction if both products are soluble or a covalent compounds is not formed)

 

1. Mg(OH)2 (s) + H2SO4 (aq)

 

 

 

2. H3PO4 (aq) + KOH (aq)

 

 

 

 

3. NH4NO3 (aq) + Ba(OH)2 (aq)

 

 

 

 

4. HBr (aq) + Pb(CO3)2 (aq)

 

 

 

 

5. LiOH (aq) + H3PO4 (aq)

 

 

 

6. Na2CO3 (aq) + HCl (aq)

Note for M-5H1:
Neutralization ion Exchange Reaction:

1.     When an acid reacts with a base, salt plus water are the products

 

Gas Forming Ion Exchange Reactions:

2.     When either H2SO3; H2CO3 or NH4OH is formed as a product it immediately

decomposes thus demonstrating a gas forming reaction.

 

3.     Most books do not show either H2CO3 or NH4OH as products, just the

decomposed products of the gases and water in the answer.

 

If H2CO3 is a predicted product in ion exchange, it is written as

CO2 and H2O.

 

For example:

Na2CO3 (aq) + HCl (aq) [H2CO3](aq) + NaCl (aq)

 

Should be written:

Na2CO3 (aq) + HCl (aq) CO2(g) + H2O (l) + NaCl (aq)

 

Two other products which are shown differently:

[NH4OH] NH3 + H2O

 

[H2SO3 ] SO2 + H2O

 

reactions

Reference:

McMurry: Section 3.1;

Jespersen 7th: Chapters 3 & 4Sections 3.8-3.9-4.5