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Questions and Answers
What is the primary characteristic that distinguishes a chemical reaction from a physical change?
What is the primary characteristic that distinguishes a chemical reaction from a physical change?
- Change in temperature
- Change in state
- Change in chemical composition (correct)
- Change in color
Which of the following is an example of a combustion reaction?
Which of the following is an example of a combustion reaction?
- Zn + CuSO4 → ZnSO4 + Cu
- 2CH4 + 3O2 → 2CO2 + 3H2O (correct)
- 2H2 + O2 → 2H2O
- 2H2O → 2H2 + O2
What is the purpose of coefficients in a chemical reaction equation?
What is the purpose of coefficients in a chemical reaction equation?
- To balance the equation (correct)
- To indicate the direction of the reaction
- To identify the reactants
- To identify the products
Which of the following factors can affect the rate of a chemical reaction?
Which of the following factors can affect the rate of a chemical reaction?
What is the term for a substance that speeds up a chemical reaction without being consumed?
What is the term for a substance that speeds up a chemical reaction without being consumed?
In a chemical reaction equation, what is written on the left side of the equation?
In a chemical reaction equation, what is written on the left side of the equation?
What is the term for a reaction in which a single reactant breaks down into two or more products?
What is the term for a reaction in which a single reactant breaks down into two or more products?
What is the principle that states that the total mass of the reactants equals the total mass of the products?
What is the principle that states that the total mass of the reactants equals the total mass of the products?
Which of the following is an example of a synthesis reaction?
Which of the following is an example of a synthesis reaction?
What is the term for a reaction in which one element or group of elements replaces another element or group of elements in a compound?
What is the term for a reaction in which one element or group of elements replaces another element or group of elements in a compound?
Study Notes
Chemical Reaction
A chemical reaction is a process in which one or more substances (reactants) are converted into new substances (products).
Types of Chemical Reactions:
- Synthesis Reaction: Two or more reactants combine to form a single product.
- Example: 2H2 + O2 → 2H2O
- Decomposition Reaction: A single reactant breaks down into two or more products.
- Example: 2H2O → 2H2 + O2
- Replacement Reaction: One element or group of elements replaces another element or group of elements in a compound.
- Example: Zn + CuSO4 → ZnSO4 + Cu
- Combustion Reaction: A reaction between a substance and oxygen, resulting in heat and light.
- Example: 2CH4 + 3O2 → 2CO2 + 3H2O
Characteristics of Chemical Reactions:
- Chemical Change: A change in the chemical composition of the reactants.
- Conservation of Mass: The total mass of the reactants equals the total mass of the products.
- Energy Change: Chemical reactions often involve the absorption or release of energy.
Factors Affecting Chemical Reactions:
- Concentration: The amount of reactants present can affect the rate of reaction.
- Temperature: An increase in temperature can increase the rate of reaction.
- Pressure: An increase in pressure can increase the rate of reaction.
- Catalysts: Substances that speed up chemical reactions without being consumed.
Chemical Reaction Equations:
- Reactants: Written on the left side of the equation.
- Products: Written on the right side of the equation.
- Arrow: Indicates the direction of the reaction.
- Coefficients: Numbers in front of formulas to balance the equation.
Chemical Reaction
- A process in which one or more substances (reactants) are converted into new substances (products)
Types of Chemical Reactions
- Synthesis Reaction: two or more reactants combine to form a single product, example: 2H2 + O2 → 2H2O
- Decomposition Reaction: a single reactant breaks down into two or more products, example: 2H2O → 2H2 + O2
- Replacement Reaction: one element or group of elements replaces another element or group of elements in a compound, example: Zn + CuSO4 → ZnSO4 + Cu
- Combustion Reaction: a reaction between a substance and oxygen, resulting in heat and light, example: 2CH4 + 3O2 → 2CO2 + 3H2O
Characteristics of Chemical Reactions
- Chemical Change: a change in the chemical composition of the reactants
- Conservation of Mass: the total mass of the reactants equals the total mass of the products
- Energy Change: chemical reactions often involve the absorption or release of energy
Factors Affecting Chemical Reactions
- Concentration: the amount of reactants present can affect the rate of reaction
- Temperature: an increase in temperature can increase the rate of reaction
- Pressure: an increase in pressure can increase the rate of reaction
- Catalysts: substances that speed up chemical reactions without being consumed
Chemical Reaction Equations
- Reactants: written on the left side of the equation
- Products: written on the right side of the equation
- Arrow: indicates the direction of the reaction
- Coefficients: numbers in front of formulas to balance the equation
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Description
Learn about the different types of chemical reactions, including synthesis, decomposition, and replacement reactions, and their examples.
