Chapter 9 Chemistry Study Guide
According to the law of conservation of mass, if two atoms of hydrogen are used as a reactant, how many atoms of hydrogen must be part of the product? ____
2
How many total atoms are in 3Na2SO4?
21 atoms
Al + HCl ---->AlCl3 + H2
2Al + 6HCl ---->2AlCl3 + 3H2
What are the correct coefficients when this equation is balanced? K + Br2 ® KBr
2K + Br2 yields 2KBr
KClO3 ----> KCl + O2
2KClO3 ----> 2KCl + 3O2
Mg(s) + O2(g) ----> MgO(s)
2Mg(s) + O2(g) ----> 2MgO(s)
Al + O2 ----> Al2O3
4Al + 3O2 ----> 2Al2O3
Sb + O2 ----> Sb4O6
4Sb + 3O2 ----> Sb4O6
C3H8 + O2 ----> CO2 + H2O
C3H8 + 5O2 ----> 3CO2 + 4H2O
CaO + H2O ----> Ca(OH)2
CaO + H2O ----> Ca(OH)2
List four indications that a chemical reaction has occurred.
Change of temperature, color change, precipitation, evolution of a gas.
Cl2(g) + KBr(aq)----> 2KCl(aq) + Br2(l)
Cl2(g) + 2KBr(aq)----> 2KCl(aq) + Br2(l)
To balance a chemical equation, it may be necessary to adjust the _____________
Coefficient
Type of Reaction? C3H8 + 5O2 ----> 3CO2 + 4H2O
Combustion
Which type of reaction takes place in the presence of oxygen and produces carbon dioxide and water?
Combustion
In what kind of reaction does a single compound produce two or more simpler substances?
Decomposition
Type of Reaction? 2KClO3 ----> 2KCl + 3O2
Decomposition
Type of Reaction? MgCO3(s) ----> MgO(s) + CO2(g)
Decomposition
Type of Reaction? Fe2(SO4)3 + 6KOH ---->3K2SO4 + 2Fe(OH)3
Double Replacement
Type of Reaction? SiO2 + 4HF ----> SiF4 + 2H2O
Double Replacement
Fe2(SO4)3 + KOH ---->K2SO4 + Fe(OH)3
Fe2(SO4)3 + 6KOH ---->3K2SO4 + 2Fe(OH)3
In writing an equation that produces hydrogen gas, the correct representation of hydrogen gas is _____
H2
MgCO3(s) ----> MgO(s) + CO2(g)
MgCO3(s) ----> MgO(s) + CO2(g)
NH4NO2(s) ----> N2(g) + H2O(l)
NH4NO2(s) ----> N2(g) + 2H2O(l)
P4 + O2 ---->P2O5
P4 + 5O2 ---->2P2O5
Pb(NO3)2(aq) + KI(aq) ---->PbI2(s) + KNO3(aq)
Pb(NO3)2(aq) + 2KI(aq) ---->PbI2(s) + 2KNO3(aq)
What is a solid produced by a chemical reaction in solution that separates from the solution called?
Precipitate
In this equation, which are the reactant(s), product(s)? Mg(s)+O2(g) yields MgO(s)
Reactants: Mg(s)+ O2(g) Products: MgO(s)
SiO2 + HF ----> SiF4 + H2O
SiO2 + 4HF ----> SiF4 + 2H2O
In what kind of reaction does one element replace a similar element in a compound?
Single Replacement
Type of Reaction? Cl2(g) + 2KBr(aq)----> 2KCl(aq) + Br2(l)
Single Replacement
Type of Reaction? NH4NO2(s) ----> N2(g) + 2H2O(l)
Single Replacement
Type of reaction? 2Al + 6HCl ---->2AlCl3 + 3H2
Single Replacement
In what kind of reaction do two or more substances combine to form a new compound?
Synthesis
Type of Reaction? 2Mg(s) + O2(g) ----> 2MgO(s)
Synthesis
Type of Reaction? 4Al + 3O2 ----> 2Al2O3
Synthesis
Type of Reaction? CaO + H2O ----> Ca(OH)2
Synthesis
Type of Reaction? P4 + 5O2 ---->2P2O5
Synthesis
Type of Reaction? Sb + O2 ----> Sb4O6
Synthesis
Which types of reactions are essentially opposites of one another? _________
Synthesis and Decomposition
In an equation, the symbol for a substance in water solution is followed by ___.
aq
A chemical equation is balanced when the same number of each kind of _____ appears in the ________ and in the products.
atoms, reactants
A(n) ____ chemical equation has the same number of atoms of each element on each side of the equation.
balance
Which equation is NOT balanced? a. 2H2 + O2®2H2O b. 4H2 + 2O2®4H2O c. H2 + H2 + O2®H2O + H2O d. 2H2 + O2®H2O
d. 2H2 + O2 yields H2O
AB----------.> A + B
decomposition
Gas may be formed, water may be produced, and a precipitate is formed are all signs that a ____________ displacement reaction has occurred.
double
AB + CD--------> AD + CB
double replacement
Type of Reaction? Pb(NO3)2(aq) + 2KI(aq) ---->PbI2(s) + 2KNO3(aq)
double replacement
According to the law of conservation of mass, the total mass of the reacting substances is always __________ to the total mass of the products.
equal
Each substance on the left side of the arrow in a chemical equation is a ____.
reactant
AB+C------------> AC + B
single replacement
A+ B--------->AB
synthesis
