Percentage Yield Flashcards
Quantitative Chemistry (16 cards)
What is yield in the context of a chemical reaction?
The amount of product you get from a reaction.
How does the amount of reactants affect actual yield?
The more reactants you start with, the higher the actual yield.
What is the formula for calculating percentage yield?
percentage yield = (mass of product actually made / maximum theoretical mass of product) × 100
What does a 100% yield indicate?
You got all the product you expected.
What does a 0% yield indicate?
No reactants were converted into product.
Why should industrial processes aim for high percentage yields?
To reduce waste and reduce costs.
Is it possible to achieve a 100% yield in real-life reactions?
No, yields are always less than 100%.
What is one reason why yields are less than 100%?
Not all reactants react to make a product.
What happens in reversible reactions that affects yield?
Products can turn back into reactants, preventing 100% yield.
Give an example of a reversible reaction.
The Haber process: N2 + 3H2 ⇌ 2NH3
What is a second reason for less than 100% yield?
There might be side reactions.
What can cause side reactions in a chemical process?
Reactants may react with gases in the air or impurities.
What is a third reason for product loss in yield?
You lose some product when separating it from the reaction mixture.
What happens when you filter a liquid to remove solid particles?
You nearly always lose a bit of liquid or solid.
What is a common issue when transferring materials between containers?
Some material always gets left behind on the inside surface.
Fill in the blank: Percentage yield is always somewhere between _____ and 100%.
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