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Questions and Answers
What type of reaction involves the transfer of electrons?
What type of reaction involves the transfer of electrons?
What is the purpose of a catalyst in a chemical reaction?
What is the purpose of a catalyst in a chemical reaction?
Which of the following reactions is an example of an exothermic reaction?
Which of the following reactions is an example of an exothermic reaction?
What is the effect of increasing the temperature of a chemical reaction?
What is the effect of increasing the temperature of a chemical reaction?
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What is an oxidizing agent in a redox reaction?
What is an oxidizing agent in a redox reaction?
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Which of the following reactions is an example of a decomposition reaction?
Which of the following reactions is an example of a decomposition reaction?
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Study Notes
Chemical Reactions
Chemical Equation
- A chemical equation is a symbolic representation of a chemical reaction
- It uses chemical formulas of reactants and products to represent the reaction
- Reactants are written on the left, and products are written on the right, separated by an arrow (→)
Types of Chemical Reactions
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Combination Reaction: two or more substances combine to form a new compound
- Example: 2H2 + O2 → 2H2O
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Decomposition Reaction: a single compound breaks down into two or more substances
- Example: 2H2O → 2H2 + O2
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Displacement Reaction: one element displaces another element from a compound
- Example: Zn + CuSO4 → ZnSO4 + Cu
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Oxidation-Reduction (Redox) Reaction: involves the transfer of electrons
- Example: 2CuO + H2 → Cu + H2O
Oxidation and Reduction
- Oxidation: a substance loses one or more electrons
- Reduction: a substance gains one or more electrons
- Oxidizing Agent: a substance that causes oxidation (gains electrons)
- Reducing Agent: a substance that causes reduction (loses electrons)
Exothermic and Endothermic Reactions
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Exothermic Reaction: a reaction that releases heat energy
- Example: CaO + H2O → Ca(OH)2 + Heat
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Endothermic Reaction: a reaction that absorbs heat energy
- Example: CaCO3 + Heat → CaO + CO2
Factors Affecting Chemical Reactions
- Temperature: increased temperature can increase reaction rate
- Concentration: increased concentration of reactants can increase reaction rate
- Surface Area: increased surface area of reactants can increase reaction rate
- Catalyst: a substance that speeds up a reaction without being consumed
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Description
Test your knowledge of chemical reactions, including types such as combination, decomposition, displacement, and oxidation-reduction reactions. Learn about oxidation and reduction, exothermic and endothermic reactions, and factors that affect reaction rates.