15. Leni was told by her teacher that one of the water samples below (figure 1) is a seawater while the other is a pure water. The teacher told her to figure out the identity of these substances by testing its boiling point. As Leni heated the samples, after 10 minutes, unknown substance A started to boil. Another 10 minutes had passed but substance A had boiled completely, while substance B is still the same, as if nothing happened. So, Leni figured out the identity of both substances and concluded that Unknown A is pure water, while Unknown B is seawater. And her answers were correct. What concept has led Leni to her answerg? Lent's answers Unknown A Unknown B Unknown A Pure water Unknown B Seawater Figure 1. Water Samples A. Pure water is a pure substance, while seawater is a mixture, B. Pure substances do not contain any other substances or impurities hence it boils at a fix rate. C. Mixtures boil at a slower rate, giving them higher boiling points due to their impurities as opposed to pure substances. D. Mixtures and pure substances are the two main types of compounds that can boil at the same time if the same amount of heat is applied.
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Answer:
15. D.Mixtures and pure substances are the two main types of compounds that can boil at the same time if the same amount of heat is applied.
Explanation:
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