This document contains a review exam for a 4th period chemistry class. It covers chapters on chemical reactions, acids, bases and salts. The exam contains multiple choice and short answer questions testing vocabulary, chemical equations, reaction types, factors affecting reaction rates, and acid/base concepts like pH, indicators, and neutralization reactions. It asks students to define terms, identify reactants and products, classify reactions, describe concepts like conservation of mass, and balance chemical equations.

1. Colegio San Patricio
Review 4th Period Exam
Name _______________________________________________ Date ____________________
Vocabulary words: Define the following terms.
1.- Chemical reaction:
2.- Reactant
3.- Product
4.- Chemical equation
5.- precipitate
6.- catalyst
7.- coefficient
8.- subscript
9.- Law of Conservation
10.- endothermic reaction
11.- exothermic reaction
12.- neutralization reaction
13.- acid
14.- base
15.- pH
16.- pH scale
CHAPTER 3 CHEMICAL REACTIONS
1.- What is the basis of all chemical reaction?
_______________________________________________________________________________________
2.- Identify the reactants and the products in the following equations:
a) NH3  N2 + H2 __________________________________________________________
b) Al + HCl  AlCl3 + H2 ____________________________________________________________
3.- List 4 types of evidence of a chemical reaction.
________________________________________________________________________________________
4.- Classify the following reactions.
a) C4H8 + 6O2 ---> 4CO2 + 4H2O
b) 2KNO3 ---> 2KNO2 + O2
c) AgNO3 + NaCl ---> NaNO3 + AgCl
d) HCl + NaOH ---> H2O + NaCl
e) Cl2 + 2KBr ---> 2KCl + Br2
f) 2Mg + O2 ---> 2MgO
5.- Describe how the following factors affect the rate of a reaction:
a) Concentration __________________________________________________________________
b) Temperature ___________________________________________________________________
c) Surface area ___________________________________________________________________

2. d) Catalyst _______________________________________________________________________
6,. State the Law of Conservation of Mass.
___________________________________________________________________________________
7.- How does a chemical equation show the conservation of mass?
____________________________________________________________________________________
8.- Balance the following chemical equations:
______NH3  ______N2 + ______H2
______ C + ______ O2  ______ CO2
______ H2S + ______ O2  ______ H2O + ______ S
______ CH2O + ______ HCl  ______ CH4O + ______ Cl2
9.- Why must equations be balanced?
______________________________________________________________________________________
______________________________________________________________________________________
10.- How is a chemical equation balanced? ____________________________________________
11.- Symbols are used in chemical equations. Fill in the table with the corresponding symbol
description symbol description symbol
 heating
With, and (aq)
(s) Precipitate
liquid catalyst
solid
12.- Write a chemical equation:
a) When lithium hydroxide is added to a solution of sulfuric acid, lithium sulfate and water
are formed.
_____________________________________________________________________________________
b) When crystalline C6H12O6 is burned in oxygen, carbon dioxide and water vapor are
formed.
_______________________________________________________________________________________
c) metallic sodium and water react to form a solution of sodium hydroxide and hydrogen
gas
_____________________________________________________________________________________
d) sodium bromide and chlorine gas react to produce sodium chloride solutions and liquid
bromine
____________________________________________________________________________________
13.- Review Nomenclature. Write the name or the formula.

3. Ionic or Covalent Name Formula
Sodium Iodide
MgCO3
Aluminum nitrate
Ba(OH)2
Dinitrogen tetrahydride
Cl2O7
Phosphorous pentabromide
BCl3
Lithium chlorate
KHSO4
Ammonium phosphate
CHAPTER 4 ACIDS, BASES AND SALTS
1.- Identify the following as acid, base or both:
a) turn litmus paper blue ____________________
b) sour taste ____________________
d) conduct electricity when dissolved _______________
e) react with metals to produce hydrogen gas ______________
f) bitter taste ______________
g) turn litmus paper red _____________
h) react with carbonates to produce carbon dioxide gas ___________
i) dissolve in water __________
j) donate H ions _____________
k) proton acceptors ____________
2.- Name and write the formula of 3 strong acids and 2 strong bases.
_____________________________________________________________________
3.- Name and write the formula of a weak acid and a weak base.
____________________________________________________________________
4.- Distinguish between a strong acid and a weak acid.
___________________________________________________________________
4.- Fill in the table showing the colors of indicators in acids and bases

4. Indicator Color in acidic solutions Color in basic solutions
litmus
phenolphtalein
Red cabbage juice
5.- What are the products of a neutralization reactions?
_______________________________________________________________________________
6.- What is an antacid? Name examples.
________________________________________________________________________________
7.- Match the reactants with the products of the following neutralization reactions.
_____NaOH + HCl a) H2O + Mg3(PO4)2
_____ HF + KOH b) NaCl + H2O
_____ H2SO4 + Ca(OH)2 c) KF + H2O
_____ Mg(OH)2 + H3PO4 d) H2O + CaSO4
8.- Identify the following as acidic, Basic or neutral
a) water pH = 7
b) coffee pH = 4
c) drain cleaner pH = 11.5
d) H < OH
e) H > OH
f) H = OH