Module 4 DBA & Exam Review 
Edited questions 6, 9, 20 on 02/02/23 

This review is neither a replica of the exam nor does it contain every concept in the module.  It is always best practice to review all lessons and assessments and ensure you have your comprehensive notes. Resubmitting is a great way to review/learn and improve your grade.   In this review, questions 1 – 25 are the general topics for the multiple choice type questions on the module exam; questions 26-27 are covered as an essay on the exam. Questions 27-34 are the honors extension questions. The number in parenthesis is the corresponding lesson. Please contact your instructor with any questions (Answer key).
Segment 1 Formula Sheet - Google Copy 	
Segment 1 Formula Sheet - RTF download
Module 4 Overview "Cheat Sheet" (Google Doc)
Module 4 Overview "Cheat Sheet" (RTF download)

●	Module 4 Regular Exam: There are 18 questions on the actual exam
○	16 multiple choice and 2 essay/free responses.
●	Module 4 Honors Exam: There are 21 questions on the actual exam
○	18 multiple choice and 3 essay/free responses.
Multiple Choice format questions:
1.	Which of the following is a balanced equation? (4.01)  
a.	6LiOH   +  Ca3(PO4)2 →   2Li3PO4   +  3Ca(OH)2 
b.	2AlCl3  +  2F2  ⇾  2Cl2 + 2AlF3                     	
c.	3Mg(ClO3)2  +  AlPO4  →   Al(ClO3)3  +  Mg3(PO4)2
d.	2Ca + Al2(SO4)3 →  2Al + 2CaSO4 	

2.	What type of system do we need for the law of conservation of mass? (4.01)
a.	Open system			c. Isolated system
b.	Closed system			d. Any type of system

3.	What coefficients must be added to balance the following reaction? (4.01) 
 Na2SO4  +  HBr  →  NaBr  +  H2SO4
a.	3, 2, 1, 2                           	c.  1, 2, 2, 1
b.	1, 3, 2, 1                           	d. 3, 2, 2, 1

4.	Which of the following equations violates the law of conservation of mass? (4.01)
a.	2NH3   →  N2 + 3H2
b.	3Sn + 2H3PO4   →    3H2   +   Sn3(PO4)4
c.	4(NH4)3PO4 + 3Pb(NO3)4 → Pb3(PO4)4 + 12NH4NO3
d.	2H2S + 3O2 → 2H2O + 2SO2

5.	Look at the unbalanced chemical equation:   MgO + 2HCl →  MgCl2 + H2O  (4.01)
How many atoms of hydrogen (H) are present on both sides of the equation?
a.	1				c.  3
b.	2				d.  4

6.	Which of the following shows a valid unbalanced reaction Na2O and H2O react together? (4.02)
a.	Na2O and H2O →   Na(OH)2  + H2
b.	NaO and H2O →   H2   +  NaOH  
c.	Na2O and H2O →   NaOH  
d.	Na2O and H2O →   Na2OH  + H2

7.	What is always true of a combustion reaction? (4.02)
a.	In a combustion, carbon dioxide gas, CO2, is always a reactant
b.	We always form oxygen gas, O2
c.	Water is always a reactant
d.	A lot of energy is released

8.	Which of the following statements is true of the combustion of an organic compound? (4.02)
a.	Water is always a reactant
b.	Oxygen gas, O2 is always a reactant
c.	It can be considered a synthesis reaction
d.	It doesn’t release a lot of energy.

9.	Which of the following is produced when Lithium (Li) combusts? (4.02)
a.	O2                                       	c.  Li2O
b.	LiO                                      	d. H2O

10.	Which of the following is produced when propane (CH4) is combusted completely? (4.04)
a.	CH4O                                 	b. H2O
b.	O2                                       	d. C2O2

11.	Which of the following shows the balanced equation for the reaction that represents the decomposition of calcium carbonate CaCO3? (4.02)
a.	2CaCO3  → 2CaO + H2O
b.	CaCO3 →  Ca2O2 + H2O
c.	CaO + H2O → CaCO3
d.	CaCO3 →  CaO + CO2

12.	Which of the following is a product formed when PO3 and H2O react together? (4.02)
a.	PO4
b.	H2O
c.	H3PO4
d.	HPO4 

13.	Two chemical reactions are shown: (4.02)
A.	2H2O → 2H2 + O2 
B.	2H2 + O2 → 2H2O
Which statement is true?
a.	A is decomposition, B is synthesis
b.	A is synthesis, A is decomposition
c.	Both are decomposition reactions
d.	Both are synthesis reactions

14.	Which of the following best describes the following reaction:
H+   +   Cl+   +   Na+    +  OH+ → Na+   + Cl+   +   H+   + OH+

a.	It is a single replacement reaction because hydrogen is highly reactive
b.	It is a double replacement reaction because H and sodium switch places
c.	It is a redox reaction because there are ions present
d.	It is a combustion reaction because oxygen is a reactant.

15.	 Which of the following is an acid-base reaction? (4.03)
a.	PO3 + 3H2O → 2H3PO3
b.	KOH + HCl  → KCl  + H2O
c.	CaCO3 →  CaO + CO2
d.	2Al + 6HCl  → 2AlCl + 3H2

16.	What is most likely the result of this reaction: Zn + AuCl2?    (4.03)
a.	ZnCl3 + Au
b.	Cl2 + AuZn
c.	ZnCl2 + Au
d.	No reaction

17.	Which statement is correct about the reaction that occurs between Li and CuO? (4.03)
a.	It is a combustion reaction because oxygen is a reactant.
b.	It is a single replacement reaction because lithium replaces oxygen 
c.	It is a synthesis reaction because only one product is formed.
d.	It is a single replacement reaction because lithium is more reactive than copper

18.	Which of the following is true for reduction-oxidation (redox) reactions? (4.04)
a.	The reduced element gains electrons and the oxidized element loses electrons
b.	The oxidized element gains electrons and the reduced element loses electrons
c.	The reduced element gains protons and the oxidized element loses protons
d.	The reduced element gains neutrons and the oxidized element loses neutrons

19.	Read the following chemical equation.  (4.04)
Na(s)  +   Mg+2   F- →  Na+ F-  + Mg(s)
What most likely happens during this reaction?
a.	Sodium gains one electron
b.	Fluorine gains one electron
c.	Sodium loses one electron
d.	Magnesium loses one electron

20.	In which of the following reactions is Mg oxidized?  (4.04)
a.	Ca3(PO4)2  +  3Mg(OH)2   →  Mg3(PO4)2  + 3Ca(OH)2
b.	Mg2+ O2-     +   2 H+ 2Cl-    →   Mg2+  2Cl-   + H2O
c.	Mg  →   Mg2+ + 2e-  
d.	Ca3P2   +  3MgS  →  Mg3P2  + 3CaS

21.	Classify the following balanced reaction. (4.02 – 4.04)     MgO + 2HCl →  MgCl2 + H2O
a.	Single replacement   	  	c. Acid-base
b.	Double replacement 	  	d. Combustion

22.	According to the activity series, which of the following single replacement reactions will NOT take place? (4.02 - 4.04)
a.	Zn + MgCl2 →  Mg + ZnCl2
b.	Li + AgNO3 → Ag  + LiNO3
c.	CaCl2 + 2Na  → 2NaCl  +  2Ca
d.	Pb(NO3)2 + Ni → Ni(NO3)2  +  Pb

23.	Classify the following balanced reaction. (4.02 – 4.04)    	2H2 + N2 → 2NH3
a.	Single replacement  	   	c. Synthesis
b.	Double replacement  	 	d. Decomposition

24.	Which of the following is true for fission reactions? (4.05)
a.	It is more powerful than fusion reactions
b.	It is the type of nuclear reaction that occurs in the sun and other stars.
c.	It changes the chemical identity of the element
d.	No mass is changed

25.	What is true for chemical reactions, but not nuclear reactions? (4.05)
a.	A nucleus splits apart.
b.	Two smaller nuclei come together.
c.	Only the valence electrons are involved.
d.	A lot of energy is produced.
Essay format questions:
26.	What coefficients should be added to balance the equation below: 
LiCl + Al2(CO3)3   ⇾      AlCl3+ Li2CO3
Use complete sentences to explain your answer.  (4.01)

27.	Compare and contrast the two types of nuclear reactions.  (4.05) 

Honors Extension (MC and Essay):
28.	 (4.06H) Select the force that governs nuclear decay and radioactivity.
a.	Gravity			c. Electromagnetic
b.	Strong nuclear			d. Weak nuclear

29.	(4.06H) Which of the following is in the correct order of increasing penetrating power. 
a.	Beta < alpha < gamma		b.  Alpha < beta < gamma
b.	Gamma < alpha < beta		d.  Gamma < beta < alpha

30.	(4.06H)  Which of the following is in the correct order of decreasing force? 
a.	Gravitational > electromagnetic > strong nuclear > weak nuclear
b.	Electromagnetic > strong nuclear > gravitational  > weak nuclear
c.	Strong nuclear > electromagnetic > weak nuclear > gravitational  
d.	Strong nuclear > Gravitational > electromagnetic > > weak nuclear

31.	(4.06H) If it takes 150 days for a sample to decay from 80 grams to 10 grams, what is the half-life of this isotope? 
a.	19 days		c. 100 days
b.	50 days		d. 300 days

32.	(4.06H) What can happen if a neutron strikes a heavy atom and what is the scientific term for this process? 

33.	(4.06H)  Compare and contrast beta particles, alpha particles and gamma rays.

34.	(4.06H) The table shows the amount of radioactive element remaining in a sample over a period of time.

Radioactive Decay Rate		
Amount of Radioactive Sample (g)	Time (minutes)	
1024	0	
896	3.5	
768	7.0	
640	10.5	
512	14.0	
384	17.5	

a.	Part 1: What is the half-life of the element? Explain how you determined this.
b.	Part 2: How long would it take 1745 g of the sample to decay to 218.13 grams? Show your work or explain your answer.