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Questions and Answers
What coefficients would balance the equation Al + O2 → Al2O3?
What coefficients would balance the equation Al + O2 → Al2O3?
4Al + 3O2 → 2Al2O3
What coefficients would balance the equation C2H6 + O2 → CO2 + H2O?
What coefficients would balance the equation C2H6 + O2 → CO2 + H2O?
2C2H6 + 7O2 → 4CO2 + 6H2O
Classify the chemical reaction: Mg + H2SO4 → MgSO4 + H2.
Classify the chemical reaction: Mg + H2SO4 → MgSO4 + H2.
Single replacement
Classify the chemical reaction: CaCO3 → CaO + CO2.
Classify the chemical reaction: CaCO3 → CaO + CO2.
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Which of the following is an example of a double replacement reaction?
Which of the following is an example of a double replacement reaction?
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Study Notes
Balancing Chemical Equations
- To balance the equation Al + O2 → Al2O3, use coefficients 4, 3, and 2 respectively: 4Al + 3O2 → 2Al2O3.
- For the combustion reaction C2H6 + O2 → CO2 + H2O, the balanced equation is 2C2H6 + 7O2 → 4CO2 + 6H2O.
Types of Chemical Reactions
- The reaction Mg + H2SO4 → MgSO4 + H2 is classified as a single replacement reaction, where magnesium displaces hydrogen.
- The decomposition reaction CaCO3 → CaO + CO2 breaks down calcium carbonate into calcium oxide and carbon dioxide.
Identifying Reaction Types
- An example of a double replacement reaction is BaCl2 + K2CO3 → BaCO3 + 2KCl, where two compounds exchange partners.
- Other reactions include combinations (like 3Fe + 2O2 → Fe3O4) and decompositions (like NiCO3 → NiO + CO2).
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