Problem: Which of these mixtures are heterogeneous? a. oil and water b. salt and water c. brass (an alloy of copper and zinc) d. granite (a type of rock with multicolor spots)

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Heterogenous → visually not uniform, distinct layers

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Problem Details

Which of these mixtures are heterogeneous? 

a. oil and water 

b. salt and water 

c. brass (an alloy of copper and zinc) 

d. granite (a type of rock with multicolor spots)

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Based on our data, we think this problem is relevant for Professor Skipworth's class at WKU.