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Questions and Answers
What is stoichiometry primarily concerned with?
What is stoichiometry primarily concerned with?
In a balanced equation, coefficients represent the ratio of grams of each substance.
In a balanced equation, coefficients represent the ratio of grams of each substance.
False
What does the law of conservation of mass state?
What does the law of conservation of mass state?
Mass is neither created nor destroyed in a chemical reaction.
The molar mass of CO2 is _____ g/mol.
The molar mass of CO2 is _____ g/mol.
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Match the following substances with their molar mass:
Match the following substances with their molar mass:
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What method is a shortcut for solving proportions in stoichiometry?
What method is a shortcut for solving proportions in stoichiometry?
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The coefficients in balanced equations represent the ratio of grams only.
The coefficients in balanced equations represent the ratio of grams only.
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What is the first step in using the big bridge method in stoichiometry?
What is the first step in using the big bridge method in stoichiometry?
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To find the number of slices of bread needed for 12 slices of cheese using the bridge method, first divide by the coefficient of the ______ substance.
To find the number of slices of bread needed for 12 slices of cheese using the bridge method, first divide by the coefficient of the ______ substance.
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Match the types of bridges with their primary usages:
Match the types of bridges with their primary usages:
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If we have 4 moles of carbon monoxide, we need 3 moles of oxygen.
If we have 4 moles of carbon monoxide, we need 3 moles of oxygen.
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How many liters of O2 do we need for 12 liters of CO2 based on the little bridge?
How many liters of O2 do we need for 12 liters of CO2 based on the little bridge?
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The total mass of the reactants in a chemical reaction is equal to the total mass of the ______.
The total mass of the reactants in a chemical reaction is equal to the total mass of the ______.
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Match the following stoichiometry problems with their answers:
Match the following stoichiometry problems with their answers:
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What is the first operation performed in the Big Bridge method?
What is the first operation performed in the Big Bridge method?
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In the Big Bridge method, the order of operations is crucial to obtaining the correct result.
In the Big Bridge method, the order of operations is crucial to obtaining the correct result.
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What result do you get when you follow the Big Bridge method with the number 112, using the factors: divided by 2, divided by 28, times 32, times 1?
What result do you get when you follow the Big Bridge method with the number 112, using the factors: divided by 2, divided by 28, times 32, times 1?
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The Little Bridge method is used for ______, liters, or moles.
The Little Bridge method is used for ______, liters, or moles.
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Match the following methods with their primary usage:
Match the following methods with their primary usage:
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What is the balanced equation for the reaction between carbon monoxide and oxygen?
What is the balanced equation for the reaction between carbon monoxide and oxygen?
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The Big Bridge method includes only multiplication operations.
The Big Bridge method includes only multiplication operations.
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What is the first step in using the Big Bridge method?
What is the first step in using the Big Bridge method?
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In the Big Bridge method, to find grams of cheese given grams of bread, we multiply by the factor of _____ from the balanced equation.
In the Big Bridge method, to find grams of cheese given grams of bread, we multiply by the factor of _____ from the balanced equation.
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Match the following elements with their usage in the reaction.
Match the following elements with their usage in the reaction.
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If 60 grams of bread are used, what would be the grams of sandwich produced using the Big Bridge method with a factor of 35?
If 60 grams of bread are used, what would be the grams of sandwich produced using the Big Bridge method with a factor of 35?
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The Big Bridge method can be applied without a balanced equation.
The Big Bridge method can be applied without a balanced equation.
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What does the Big Bridge method primarily solve for?
What does the Big Bridge method primarily solve for?
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Study Notes
Stoichiometry
- Stoichiometry is the study of quantitative relationships between reactants and products in chemical reactions
- It comes from Greek words: stoichio (element) and metri (measure)
Understanding Coefficients
- Coefficients in balanced equations indicate the ratio of moles, gas volumes (same temperature and pressure), and particles (molecules or atoms) of each substance
- Coefficients do not represent the ratio of grams, because molar masses are different
Law of Conservation of Mass
- The total mass of reactants equals the total mass of products
- Mass is neither created nor destroyed in a chemical reaction, only converted
Using Proportions
- Proportions can solve stoichiometry problems
- Example: 12 slices of bread require 6 slices of cheese (12/2 = x/1, x = 6)
The Bridge Method
- A shortcut for solving proportions
- Involves dividing and multiplying
- Divide by the coefficient of the starting substance
- Multiply by the coefficient of the ending substance
- Example: Finding cheese for 12 slices of bread (12/2 * 1 = 6)
Examples Using the Bridge Method
- Different examples demonstrate the method
- Example: 9 slices cheese = 18 slices bread
Stoichiometry Basics
- Stoichiometry studies the amounts of substances in reactions
- Two types of bridges are used: Little Bridge and Big Bridge
Little Bridge
- Used for moles, liters, or particles
- Formula: (given coefficient * coefficient of unknown * molar mass of unknown) / (coefficient of given)
- No molar mass required for moles or liters
Big Bridge
- Used for grams
- Formula: (given mass * coefficient of given * molar mass of unknown) / (coefficient of given * molar mass of given)
- Requires molar mass information
Examples
- Provides examples in different contexts (moles of O2, liters of O2, grams problems)
Double Checking
- Double check by using additional calculations
- Results of Big Bridged method can be added to another calculation to get the expected answer
Balancing Equations
- Balanced equations are needed for stoichiometry problems
- Example: 2CO + O2 → 2CO2 (balanced for the reaction between carbon monoxide and oxygen)
Big Bridge Method
- Method for solving problems involving grams
- A series of division and multiplication steps to calculate the desired amount
Key Differences Between Methods
- Big Bridge: used for grams
- Little Bridge: used for molecules, liters, or moles
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Description
Test your understanding of stoichiometry and the quantitative relationships in chemical reactions. This quiz covers essential concepts like coefficients, the law of conservation of mass, and methods for solving stoichiometry problems. Perfect for students studying chemistry!
