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Quantitative Relationships in Chemical Change

Accounting10 CardsCreated 3 months ago

This deck covers key concepts in chemical analysis, gravimetric analysis, and the calculation of limiting and excess reagents, as outlined in CHEM 20 Unit D.

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What is the difference between qualitative and quantitative analysis?

Qualitative analysis identifies the presence of a substance, while quantitative analysis measures the amount of a substance present.

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Key Terms

Term
Definition
What is the difference between qualitative and quantitative analysis?
Qualitative analysis identifies the presence of a substance, while quantitative analysis measures the amount of a substance present.
What is gravimetric analysis?
Gravimetric analysis is a quantitative technique that involves measuring the mass of a substance to determine the amount of a reactant or product.
What is the role of a limiting reagent in a chemical reaction?
The limiting reagent is completely consumed first, stopping the reaction and determining the maximum amount of product that can be formed.
What is an excess reagent?
An excess reagent is any reactant that remains after the limiting reagent is completely consumed in a chemical reaction.
How can you identify a limiting reagent in a reaction?
Calculate the moles of each reactant and determine which produces the least amount of product; this is the limiting reagent.
What is colorimetry used for in chemical analysis?
Colorimetry is a qualitative tool used to identify substances based on their distinct colors.

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Quantitative Relationships in Chemical Change
TermDefinition
What is the difference between qualitative and quantitative analysis?
Qualitative analysis identifies the presence of a substance, while quantitative analysis measures the amount of a substance present.
What is gravimetric analysis?
Gravimetric analysis is a quantitative technique that involves measuring the mass of a substance to determine the amount of a reactant or product.
What is the role of a limiting reagent in a chemical reaction?
The limiting reagent is completely consumed first, stopping the reaction and determining the maximum amount of product that can be formed.
What is an excess reagent?
An excess reagent is any reactant that remains after the limiting reagent is completely consumed in a chemical reaction.
How can you identify a limiting reagent in a reaction?
Calculate the moles of each reactant and determine which produces the least amount of product; this is the limiting reagent.
What is colorimetry used for in chemical analysis?
Colorimetry is a qualitative tool used to identify substances based on their distinct colors.
What is a precipitate in the context of gravimetric analysis?
A precipitate is a solid that forms when two aqueous solutions react, often used to determine the amount of a substance in gravimetric analysis.
What is the purpose of a flame test in qualitative analysis?
A flame test is used to identify elements based on the color they emit when heated in a flame.
Describe the process of calculating excess reagent.
Calculate the mass of the excess reagent using the moles of the limiting reagent, then subtract from the original amount.
What is the significance of stoichiometry in gravimetric analysis?
Stoichiometry allows for the calculation of product amounts based on the complete consumption of the limiting reagent.