Chemistry Essentials
Chapter 8 Types of Reactions
Review Assignment
Reactions:
For each of the following reactions give the type of reaction. If the reaction would occur 1)
predict the product(s) and balance the equation (show your work) 2) if it is a redox reaction
determine which species is oxidized and which species is reduced (show your work.) If it is not a
redox reaction, write NOT A REDOX REACTION. If no reaction would occur, write NO
REACTION and give a reason.
1) 2 HNO3(aq) + Sr(OH)2(aq) → Sr(NO3)2(aq) + 2 HOH(l)
Double Replacement – Acid Base
NOT A REDOX REACTION
2) Fe(s) + Al2O3(s) → NO REACTION, Fe below Al in Activity Series
Single Replacement
3) 2 Mg(s) + 3N2(g) → 2 MgN3(s)
Synthesis
Mg0 → Mg2+ + 2e- loss of electrons oxidation
N0 + 2e- → N2- gain of electrons reduction
4) 2 Na(s) + Cl2(g) → 2 NaCl(s)
Synthesis
Na0 → Na+ + 1e- loss of electrons oxidation
Cl20 + 2e- → 2Cl- gain of electrons reduction
5) Sn(s) + 2AgNO3(aq) → 2Ag(s) + Sn(NO3)2(aq)
Single Replacement
Sn0(s) → Sn2+ + 2e- loss of electrons oxidation
Ag+ + 1e- → Ag0 gain of electrons reduction
6) CH4(g) + 2 O2(g) → CO2(g) + 2 H2O(l)
Combustion
Hydrogen and carbon are oxidized, and oxygen is reduced (we didn’t learn how to
treat covalent compounds)
7) AgNO3(aq) + NaCl(aq) → AgCl(s) + NaNO3(aq)
Double Replacement -- Precipitation
NOT A REDOX REACTION
8) 2 Al(s) + 3 H2(g) → 2 AlH3(s)
Synthesis
Al0 → Al3+ + 3e- loss of electrons oxidation
H20 + 2e- → 2H- gain of electrons reduction
9) H2SO4(aq) + 2 KOH(aq) → K2SO4(aq) + 2 HOH(l)
Double replacement acid-base
NOT A REDOX REACTION
10) Na2CO3(aq) + NH4Cl(aq) → NO REACTION ALL POSSIBLE PRODUCTS SOLUBLE
Double Replacement -- precipitation
11) C6H12O6(aq) + 6O2(g) → 6 CO2(g) + 6 H2O(l)
Combustion
Hydrogen and carbon are oxidized, and oxygen is reduced(we didn’t learn how to
treat covalent compounds)
12) 2 HgO(s) → 2 Hg(s) + O2(g)
Decomposition
Hg2+ + 2e- → Hg0 gain electrons reduced
O2- → O20 + 2e- loss electrons oxidized
13) 2Cr(s) + 3Pb(NO3)2(aq) → 3 Pb(s) + 2 Cr(NO3)3(aq)
Single Replacement
Cr0 → Cr3+ + 3e- loss of electrons oxidation
Pb2+ + 2e- → Pb0 gain of electrons reduction
14) 2 KOH(aq) + MgI2(aq) → 2 KI(s) + Mg(OH)2(s)
Double Replacement – Precipitation
NOT A REDOX REACTION
15) 2 HCl(aq) + Ba(OH)2(aq) → BaCl2(aq) + 2 HOH(l)
Double Replacement – acid-base
NOT A REDOX REACTION
16) HBr(aq) + NaOH(aq) → NaBr(aq) + HOH(l)
Double Replacement – acid-base
NOT A REDOX REACTION
17) Ag(s) + Zn(NO3)2(s) → NO REACTION, Ag below Zn in Activity Series
Single Replacement
18) 2 K(s) + Cl2(g) → 2 KCl(s)
Synthesis
K0 → K+ + 1e- loss of electrons oxidation
Cl20 + 2e- → 2Cl- gain of electrons reduction
19) 2 Mg(s) + O2(g) → 2 MgO(s)
Oxidation
Mg0 → Mg2+ + 2e- loss of electrons oxidation
O20 + 2e- → 2O2- gain of electrons reduction
20) 2 Na3PO4(aq) + 3 Ca(OH)2(aq) → 6 NaOH(aq) + Ca3(PO4)2(s)
Double Replacement – precipitation
NOT A REDOX REACTION
For each of the following reactions give the type of reaction. If it is a redox reaction determine
which species is oxidized and which species is reduced (show your work.) If it is not a redox
reaction, write NOT A REDOX REACTION.
21) KClO3(s) → KCl(s) + O2(g)
Decomposition
This is a redox reaction, but we didn’t learn how to do these
22) C(s) + O2(g) → CO2(g)
Combustion
Carbon is oxidized and oxygen is reduced; we did not learn how to deal with
covalent compounds
23) CaCO3(s) → CaO(s) + CO2(g)
Decomposition
This is a redox reaction, but we didn’t learn how to do these
24) K2SO3(s) → K2O(s)+ SO2(g)
Decomposition
This is a redox reaction, but we didn’t learn how to do these
Completion:
25) A chemical equation is balanced by adding _coefficients_ as needed.
26) When a chemical equation is balanced, there are the _same types of atoms and the _same_
numbers of each type of atom on _both_ sides of the equation.
27) Balancing a chemical equation satisfies the Law of Conservation of Matter.
28) When an atom gains or loses electrons_, an ion is formed.
29) An anion has more electrons than _protons__.
30) A cation has more _protons_ than _electrons____.
31) The driving forces for a chemical reaction are formation of a solid, formation of a gas,
formation of water, and transfer of electrons.
32) The loss of electrons is oxidation.
33) The gain of electrons is reduction.
34) The formula for an acid begins with H, and the formula for a base ends with OH_. Both of
these types of compounds are ionic.
35) A (n) indicator_ is a chemical that has two or more colors depending upon what type of
ions are around it.
36) When a substance dissolves in water, it is considered soluble_, and when it does not
dissolve in water it is considered _insoluble__.
37) When a calcium atom becomes a calcium ion, it _loses 2 electrons.
38) When a bromine atom becomes a bromine ion, it gains_ 1 electron.
39) The charge on any atom is _zero.
40) The charge on any compound is zero_.