Evaporation and Crystallization
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Objective
I can explain how to obtain pure crystals from a solution using evaporation and crystallization techniques, and relate it to separating mixtures like magnesium chloride from calcium sulfate.
Part 1 of 3
Warm-up video
Unknown Channel · 5:00
We don't generate video — this one is by Unknown Channel on YouTube. The practice questions and exit ticket below were drafted by AI for this objective, and every question is editable in the teacher guide.
Part 2 of 3
Practice
6 questions
Explain the difference between evaporation and crystallization as methods for separating a soluble solid from a liquid. When would you choose crystallization over evaporation?
Imagine you are trying to separate salt (sodium chloride) from a mixture of salt, sand, and water. Describe the steps you would take, including the techniques you would use and why.
Part 3 of 3
Exit ticket
Quick comprehension check
“You have a solution of potassium nitrate (KNO₃) in water. Describe the steps you would take to obtain pure crystals of potassium nitrate from this solution using crystallization. A company is trying to obtain pure copper(II) sulfate (CuSO₄) crystals from a solution. They are concerned that heating the copper(II) sulfate too much might cause it to decompose. Which separation technique, evaporation or crystallization, would be more suitable in this situation, and why?”
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