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Question 1
Copper sulfate crystals are blue and highly soluble in water. A student places copper sulfate crystals at the bottom of a beaker containing water. |
a) | Predict the changes in the appearance of the crystals and the resulting solution as the crystals of copper sulfate dissolve.
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b) | What is the name of the process that occurs as the crystals dissolve to form a solution? A melting B boiling C diffusion D crystallisation
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The student repeats the experiment using cold, lukewarm, and hot water. The image below shows the beakers containing water and copper sulfate crystals at different temperatures. |
c) | Which of the beakers, A, B, or C, contain cold water? Justify your answer.
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d) | Which of the beakers, A, B, or C, contains hot water? Justify your answer.
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e) | Explain, in terms of particles, why the observed differences occur when hot water is used instead of cold water.
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