This document contains four types of chemistry worksheets (Types A, B, C, D) with the following questions: 1. Classify chemical reactions as exothermic or endothermic. 2. Rewrite chemical reactions as balanced equations. 3. Name given chemical compounds. The worksheets provide practice classifying reaction types, writing balanced equations, and naming compounds, which are fundamental skills in chemistry.

1. Colegio San Patricio
Name _____________________________________ Date ___________________
TYPE A
1.- Classify the following reactions as exothermic or endothermic
a) N2 + O2 + E  NO
b) H2 + N2  NH3 + E
2.- Rewrite the following as chemical equation:
a) Aluminum oxide reacts with carbon to form aluminum metal and carbon dioxide
gas
b) Aqueous solutions of K2SO4 and barium chloride react to form a precipitate of
BaSO4 and a solution of potassium chloride
c) Calcium carbonate (CaCO3) decomposes when burned to produce carbon
dioxide gas and calcium oxide solid
d) Hydrogen peroxide (H2O2) decomposes in presence of MnO2 as a catalyst to
form liquid water and oxygen gas
3.- Name the following compounds.
a) NaHCO3 c) Ca(NO3)2
b) K2SO4 d) Al(C2H3O2)3
Colegio San Patricio
Name _____________________________________ Date ___________________
TYPE B
1.- Classify the following reactions as exothermic or endothermic
a) SO2 + O2  SO3 + E
b) CaCO3 + E  CaO + CO2
2.- Rewrite the following as chemical equation:
a) Nitrogen monoxide gas and oxygen gas react to form nitrogen dioxide gas
b) Carbon monoxide gas and oxygen gas react in the presence of platinum as a catalyst
to form carbon dioxide gas.
c) Solutions of AgNO3 and potassium chloride react to form a solution of KNO3 and a
precipitate of AgCl
d) C2H2 burns with oxygen gas to form carbon dioxide gas and water vapor
3.- Name the following compounds.
a) MgCO3 c) Li2Cr2O7
b) Na2SO3 d) KCN

2. Colegio San Patricio
Name _____________________________________ Date ___________________
TYPE C
1.- Classify the following reactions as exothermic or endothermic
a) KClO3 + E  KCl + O2
b) H2 + N2  NH3 + E
2.- Rewrite the following as chemical equation:
e) Aqueous solutions of KOH and FeCl3 react to form a precipitate of Fe(OH)3 and
a solution of potassium chloride
f) Magnesium carbonate (MgCO3) decomposes when burned to produce carbon
dioxide gas and magnesium oxide solid
g) Hydrogen peroxide (H2O2) decomposes in presence of MnO2 as a catalyst to
form liquid water and oxygen gas
h) Phosphorus reacts with liquid bromine to produce aluminum bromide
3.- Name the following compounds.
a) KHCO3 c) MgNO3
b) Li2SO4 d) Ba(C2H3O2)2
Colegio San Patricio
Name _____________________________________ Date ___________________
TYPE D
1.- Classify the following reactions as exothermic or endothermic
a) SO2 + O2  SO3 + E
b) CaCO3 + E  CaO + CO2
2.- Rewrite the following as chemical equation:
a) Nitrogen dioxide gas and liquid water react to form HNO3 solution and nitrogen
monoxide gas
b) Carbon monoxide gas and oxygen gas react in the presence of platinum as a catalyst
to form carbon dioxide gas.
c) Aqueous solutions of KOH and FeCl3 react to form a precipitate of Fe(OH)3 and a
solution of potassium chloride
d) Calcium carbonate (CaCO3) decomposes when burned to produce carbon dioxide gas
and calcium oxide solid
3.- Name the following compounds.
a) CaCO3 c) K2Cr2O7
b) Li2SO3 d) Al(OH)3