The Percentage Yield (Leaving Cert Chemistry): Quizzes
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Practise the questions
12 questions from this quiz
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Practise the questions
12 questions from this quiz
What does percentage yield measure in a chemical reaction?
What does percentage yield measure in a chemical reaction?
The efficiency of the reaction
What is theoretical yield?
What is theoretical yield?
Maximum possible product if perfect
What is actual yield?
What is actual yield?
Product actually obtained in practice
What is the formula for percentage yield?
What is the formula for percentage yield?
What unit requirement exists for percentage yield calculations?
What unit requirement exists for percentage yield calculations?
Actual and theoretical in same units
Why are incomplete reactions a problem for yield?
Why are incomplete reactions a problem for yield?
They don't go to completion
Which is NOT a reason for actual yield being less than theoretical?
Which is NOT a reason for actual yield being less than theoretical?
Using a balanced equation
What percentage yield is considered very good in industrial processes?
What percentage yield is considered very good in industrial processes?
80-90%
What is the first step in percentage yield calculations?
What is the first step in percentage yield calculations?
Write the balanced equation
What formula converts mass to moles?
What formula converts mass to moles?
In the ethanol example, 20g ethanol gave 8g ethene. What was the percentage yield?
In the ethanol example, 20g ethanol gave 8g ethene. What was the percentage yield?
65.68%
Why are percentage yields usually less than 100%?
Why are percentage yields usually less than 100%?
Reactions are rarely perfect