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Questions and Answers
What is a word equation?
What is a word equation?
An equation in which the reactants and products in a chemical reaction are represented by words.
What is a formula equation?
What is a formula equation?
An equation in which the reactants and products of the chemical reaction are represented by symbols.
What does a chemical equation represent?
What does a chemical equation represent?
Represents, with symbols and formulas, the identities and relative molecular or molar amounts of the reactants and products in a chemical reaction.
What is a coefficient in a chemical equation?
What is a coefficient in a chemical equation?
What is a reversible reaction?
What is a reversible reaction?
What is electrolysis?
What is electrolysis?
What is a precipitate?
What is a precipitate?
What is the formula for a double-replacement reaction?
What is the formula for a double-replacement reaction?
What occurs in a double-replacement reaction?
What occurs in a double-replacement reaction?
What is the formula for a single-replacement reaction?
What is the formula for a single-replacement reaction?
Single-replacement is also known as ________.
Single-replacement is also known as ________.
What occurs in a single-replacement reaction?
What occurs in a single-replacement reaction?
What is the formula for a synthesis reaction?
What is the formula for a synthesis reaction?
Synthesis reaction is also known as _______.
Synthesis reaction is also known as _______.
What occurs during a synthesis reaction?
What occurs during a synthesis reaction?
What is an activity series?
What is an activity series?
Give four examples that describe the indications that a chemical reaction has occurred.
Give four examples that describe the indications that a chemical reaction has occurred.
Balance the equation C₂H₄ + O₂ → CO₂ + H₂O.
Balance the equation C₂H₄ + O₂ → CO₂ + H₂O.
Combustion happens when you add ______.
Combustion happens when you add ______.
Balance the equation CaCl₂ + KOH → KCl + Ca(OH)₂.
Balance the equation CaCl₂ + KOH → KCl + Ca(OH)₂.
In a single-replacement reaction always remember to ______ when completing the replacement.
In a single-replacement reaction always remember to ______ when completing the replacement.
For the single-replacement reaction use the ______ chart.
For the single-replacement reaction use the ______ chart.
In the activity series chart the most active are located at the ______ of the chart.
In the activity series chart the most active are located at the ______ of the chart.
Name and balance the chemical reaction: Mg + N₂ → Mg₃N₂.
Name and balance the chemical reaction: Mg + N₂ → Mg₃N₂.
Name and balance the chemical reaction: Co(NO₃)₂ + H₂S → CoS + HNO₃.
Name and balance the chemical reaction: Co(NO₃)₂ + H₂S → CoS + HNO₃.
Name and balance the chemical reaction: C₄H₁₀ + O₂ → CO₂ + H₂O.
Name and balance the chemical reaction: C₄H₁₀ + O₂ → CO₂ + H₂O.
Name and balance the chemical reaction: Cl₂ + NaI → NaCl + I₂.
Name and balance the chemical reaction: Cl₂ + NaI → NaCl + I₂.
Name and balance the chemical reaction: NaClO₃ → NaCl + O₂.
Name and balance the chemical reaction: NaClO₃ → NaCl + O₂.
Using your activity series, balance the equation: I₂ + KF →
Using your activity series, balance the equation: I₂ + KF →
Using your activity series, balance the equation: Mg + ZnCl₂ →
Using your activity series, balance the equation: Mg + ZnCl₂ →
Using your activity series, balance the equation: Al + H₂O (l) →
Using your activity series, balance the equation: Al + H₂O (l) →
Using your activity series, balance the equation: Al + H₂O (s) →
Using your activity series, balance the equation: Al + H₂O (s) →
What has iron been replaced by in the following reaction? 2Al(s) + 3Fe(NO₃)₂ (aq) → 3Fe(s) + 2Al(NO₃)₃ (aq)
What has iron been replaced by in the following reaction? 2Al(s) + 3Fe(NO₃)₂ (aq) → 3Fe(s) + 2Al(NO₃)₃ (aq)
Of the following chemical equations, the only reaction that is both synthesis and combustion is: C(s) + CO₂.
Of the following chemical equations, the only reaction that is both synthesis and combustion is: C(s) + CO₂.
Of the following chemical equations, the only reaction that is both combustion and decomposition is: 2H₂O₂(l) → 2H₂O(l) + O₂.
Of the following chemical equations, the only reaction that is both combustion and decomposition is: 2H₂O₂(l) → 2H₂O(l) + O₂.
Balance the following chemical reaction: Ca₃(PO₄)₂ + 3H₂SO₄ → 2H₃PO₄ + 3CaSO₄.
Balance the following chemical reaction: Ca₃(PO₄)₂ + 3H₂SO₄ → 2H₃PO₄ + 3CaSO₄.
Balance the following chemical reaction: Ca + 2H₂O → Ca(OH)₂ + H₂.
Balance the following chemical reaction: Ca + 2H₂O → Ca(OH)₂ + H₂.
Balance the following chemical reaction: 2ZnS + 3O₂ → 2ZnO + 2SO₂.
Balance the following chemical reaction: 2ZnS + 3O₂ → 2ZnO + 2SO₂.
Balance the following equations: 2H₂ + O₂ → H₂O.
Balance the following equations: 2H₂ + O₂ → H₂O.
Balance the following equations: S₈ + O₂ → SO₃.
Balance the following equations: S₈ + O₂ → SO₃.
Balance the following equations: C₇H₆O₂ + O₂ → CO₂ + H₂O.
Balance the following equations: C₇H₆O₂ + O₂ → CO₂ + H₂O.
Balance the following equations: C₂H₂ + O₂ → CO₂ + H₂O.
Balance the following equations: C₂H₂ + O₂ → CO₂ + H₂O.
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Study Notes
Chemical Equations and Reactions
- Word Equation: Represents reactants and products using words.
- Formula Equation: Uses chemical symbols for reactants and products.
- Chemical Equation: Displays reactants and products with symbols and molecular amounts, indicating their identities.
- Coefficient: A small whole number before a formula, indicating the amount of a reactant or product.
Types of Reactions
- Reversible Reaction: Products can reform into original reactants.
- Electrolysis: Decomposition caused by an electric current.
- Precipitate: A solid formed in a solution during a chemical reaction.
Reaction Types Definitions
- Double-Replacement Reaction: Ions in two compounds exchange places, forming two new compounds (AX + BY → AY + BX).
- Single-Replacement Reaction: An element replaces a similar element in a compound (A + BX → AX + B).
- Synthesis Reaction: Two or more substances combine to form a new compound (A + X → AX).
- Combustion Reaction: A substance combines with oxygen, producing heat and light (e.g., 2H₂ + O₂ → 2H₂O).
Indicators of Chemical Reactions
- Heat release
- Color change
- Formation of a precipitate
- Production of gas or bubbles
Balancing Chemical Equations
- C₂H₄ + O₂ → CO₂ + H₂O balanced to C₂H₄ + 3O₂ → 2CO₂ + 2H₂O.
- Balancing must preserve the number of atoms on both sides.
Activity Series
- A list ranking elements based on their reactivity, with more active elements at the top.
- Used to predict reactions in single-replacement reactions.
Examples of Balanced Reactions
- Synthesis: 3Mg + N₂ → Mg₃N₂.
- Double-Replacement: Co(NO₃)₂ + H₂S → CoS + 2HNO₃.
- Decomposition: 2NaClO₃ → 2NaCl + 3O₂.
- Combustion: 2C₄H₁₀ + 13O₂ → 8CO₂ + 10H₂O.
Specialized Reactions
- Single-Replacement Reaction: Chlorine replaces iodine in 2NaI to form 2NaCl.
- Combustion and Decomposition: Combustion of hydrocarbons like in 2C₄H₁₀ + 13O₂ → 8CO₂ + 10H₂O demonstrates both processes.
Notable Chemical Transformations
- Sulfuric Acid in Phosphoric Acid Production: Ca₃(PO₄)₂ + 3H₂SO₄ → 2H₃PO₄ + 3CaSO₄.
- Calcium Metal Reaction with Water: Ca + 2H₂O → Ca(OH)₂ + H₂.
- Zinc Oxide Production: 2ZnS + 3O₂ → 2ZnO + 2SO₂.
Balancing Additional Equations
- H₂ + O₂ → H₂O balanced to 2H₂ + O₂ → 2H₂O.
- S₈ + O₂ → SO₃ balanced to S₈ + 12O₂ → 8SO₃.
- C₂H₂ + O₂ → CO₂ + H₂O balanced to 2C₂H₂ + 5O₂ → 4CO₂ + 2H₂O.
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