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Balancing Chemical Equations: Skeleton Equations and Coefficients, Exams of Chemistry

Pennsylvania State University - ScrantonChemistry

A series of chemical reactions with their corresponding word equations. For each reaction, the student is asked to write the skeleton equation and then balance the equation by adding the correct coefficients. Various types of reactions and compounds, including gases, solids, liquids, and aqueous solutions.

Typology: Exams

2021/2022

Uploaded on 09/12/2022

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hambery 🇺🇸

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Writing and Balancing Chemical Equations
Balancing chemical equations gets easier with practice. It is a basic guess-and-check method, often called
“Balancing by Inspection”.
Important notes:
Hydrogen gas = H2
Nitrogen gas = N2
Oxygen gas = O2
Fluorine gas = F2
Chlorine gas = Cl2
Bromine liquid = Br2
Iodine solid = I2
Unless otherwise
stated, water is in liquid form.
For each of the following word equations, write the skeleton equation and then balance the equation. Be sure to use
all proper symbols like (s), (l), (g), and (aq). If the skeleton equation is already provided, then simply balance the
equation by writing the correct coefficients in the blanks. If the equation is already balanced, write “Balanced”.
Example:
Hydrogen sulfide gas reacts with oxygen gas to yield sulfur dioxide gas and water.
Skeleton equation: H2S(g) + O2(g) → SO2(g) + H2O(l)
Balanced equation: 2H2S(g) + 3O2(g) → 2SO2(g) + 2H2O(l)
(You need not write the equation twice, just balance the skeleton equation.)
PLEASE USE PENCIL! PLEASE USE PENCIL!
1. Liquid carbon disulfide reacts with oxygen gas to yield carbon dioxide gas and sulfur dioxide gas.
2. Methane (CH4) gas reacts with oxygen gas to yield carbon dioxide gas and water.
3. Solid zinc (Zn+2) sulfide reacts with oxygen gas to yield solid zinc oxide and sulfur dioxide gas.
4. ____ Na + ____ Cl2 → ____ NaCl
5. ____ Sr + ____ AuNO3 → ____ Sr(NO3)2 + ____ Au
6. ____ SO3 + ____ H2O → ____ H2SO4
7. ____ KOH + ____ H3PO4 → ____ K3PO4 + ____ H2O
8. ____ Li + ____ H2O → ____ LiOH + ____ H2
9. ____ Li2O + ____ H2O → ____ LiOH
10. ____ Hg(MnO4)2 + ____ Al2(Cr2O7)3 → ____ HgCr2O7 + ____ Al(MnO4)3
11. ____ Ba + ____ P4 → ____ Ba3P2
12. ____ F2 + ____ BiCl3 → ____ Cl2 + ____ BiF3
13. ____ Pb(NO3)4 + ____ K2S → ____ KNO3 + ____ PbS2
14. Water is decomposed with electricity to yield hydrogen gas and oxygen gas.
15. Solid magnesium reacts with oxygen gas to yield solid magnesium oxide.
16. Carbon dioxide gas reacts with water to yield solid glucose (C6H12O6) and oxygen gas.
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Download Balancing Chemical Equations: Skeleton Equations and Coefficients and more Exams Chemistry in PDF only on Docsity!

Writing and Balancing Chemical Equations Balancing chemical equations gets easier with practice. It is a basic guess-and-check method, often called “Balancing by Inspection”.

Important notes: Hydrogen gas = H 2 Nitrogen gas = N 2 Oxygen gas = O 2

Fluorine gas = F 2 Chlorine gas = Cl 2 Bromine liquid = Br 2

Iodine solid = I 2 Unless otherwise stated, water is in liquid form.

For each of the following word equations, write the skeleton equation and then balance the equation. Be sure to use all proper symbols like (s), (l), (g), and (aq). If the skeleton equation is already provided, then simply balance the equation by writing the correct coefficients in the blanks. If the equation is already balanced, write “Balanced”.

Example: Hydrogen sulfide gas reacts with oxygen gas to yield sulfur dioxide gas and water. Skeleton equation: H 2 S(g) + O 2 (g) → SO 2 (g) + H 2 O(l) Balanced equation: 2H 2 S(g) + 3O 2 (g) → 2SO 2 (g) + 2H 2 O(l) (You need not write the equation twice, just balance the skeleton equation.)

PLEASE USE PENCIL! PLEASE USE PENCIL!

  1. Liquid carbon disulfide reacts with oxygen gas to yield carbon dioxide gas and sulfur dioxide gas.
  2. Methane (CH 4 ) gas reacts with oxygen gas to yield carbon dioxide gas and water.
  3. Solid zinc (Zn+2) sulfide reacts with oxygen gas to yield solid zinc oxide and sulfur dioxide gas.
  4. ____ Na + ____ Cl 2 → ____ NaCl
  5. ____ Sr + ____ AuNO 3 → ____ Sr(NO 3 ) 2 + ____ Au

6. ____ SO 3 + ____ H 2 O → ____ H 2 SO 4

7. ____ KOH + ____ H 3 PO 4 → ____ K 3 PO 4 + ____ H 2 O

  1. ____ Li + ____ H 2 O → ____ LiOH + ____ H 2
  2. ____ Li 2 O + ____ H 2 O → ____ LiOH
  3. ____ Hg(MnO 4 ) 2 + ____ Al 2 (Cr 2 O 7 ) 3 → ____ HgCr 2 O 7 + ____ Al(MnO 4 ) 3
  4. ____ Ba + ____ P 4 → ____ Ba 3 P 2
  5. ____ F 2 + ____ BiCl 3 → ____ Cl 2 + ____ BiF 3
  6. ____ Pb(NO 3 ) 4 + ____ K 2 S → ____ KNO 3 + ____ PbS 2
  7. Water is decomposed with electricity to yield hydrogen gas and oxygen gas.
  8. Solid magnesium reacts with oxygen gas to yield solid magnesium oxide.
  9. Carbon dioxide gas reacts with water to yield solid glucose (C 6 H 12 O 6 ) and oxygen gas.
  1. ____ H 3 PO 3 + ____ (NH 4 ) 2 CrO 4 → ____ (NH 4 ) 3 PO 3 + ____ H 2 CrO 4 18.. ____ Sn(OH) 2 → ____ SnO + ____ H 2 O

19. ____ H 2 SO 4 → ____ SO 3 + ____ H 2 O

20.. ____ P 2 O 3 + ____ H 2 O → ____ H 3 PO 3

  1. ____ Zn(BrO 3 ) 2 + ____ Pb 3 (AsO 4 ) 4 → ____ Zn 3 (AsO 4 ) 2 + ____ Pb(BrO 3 ) 4
  2. ____ Rb + ____ Al(IO 4 ) 3 → ____ RbIO 4 + ____ Al 23.. ____ NaNO 3 → ____ NaNO 2 + ____ O 2
  3. ____ Fe(NO 3 ) 3 → ____ Fe 2 O 3 + ____ NO 2 + ____ O 2
  4. ____ Cd + ____ HF → ____ CdF 2 + ____ H 2
  5. ____ Sn + ____ Cl 2 → ____ SnCl 2
  6. Solid potassium fluoride reacts with aqueous sulfuric acid to yield aqueous potassium hydrogen sulfate (KHSO 4 ) and hydrogen fluoride gas.
  7. Solid copper(II) oxide reacts with hydrogen gas to yield solid copper metal and water.
  8. Solid manganese(IV) oxide reacts with hydrogen gas to yield solid manganese(II) oxide and water.
  9. ____ (NH 4 ) 2 C 2 O 4 + ____ Hg 3 (PO 3 ) 2 → ____ HgC 2 O 4 + ____ (NH 4 ) 3 PO 3
  10. ____ K 2 CO 3 + ____ MnCl 4 → ____ KCl + ____ Mn(CO 3 ) 2
  11. ____ Co 2 S 3 + ____ O 2 → ____ Co 2 O 3 + ____ S
  12. ____ (NH 4 ) 2 SO 4 + ____ Fe(NO 3 ) 3 → ____ NH 4 NO 3 + ____ Fe 2 (SO 4 ) 3
  13. ____ BaCO 3 + ____ HClO 3 → ____ Ba(ClO 3 ) 2 + ____ H 2 CO 3

35. ____ K + ____ H 2 O → ____ H 2 + ____ KOH

  1. ____ Al + ____ HCl → ____ H 2 + ____ AlCl 3
  2. ____ F 2 + ____ AsCl 3 → ____ Cl 2 + ____ AsF 3
  3. ____ Al + ____ Pb(NO 3 ) 2 → ____ Pb + ____ Al(NO 3 ) 3
  4. ____ Bi 2 S 5 + ____ SbBr 3 → ____ BiBr 5 + ____ Sb 2 S 3
  5. Methane (CH 4 ) gas reacts with water to yield carbon monoxide gas and hydrogen gas.
  6. Carbon monoxide gas reacts with water to yield carbon dioxide gas and hydrogen gas.