Chemistry Chapter 2 Quiz 2 Critical Analysis – Flashcards
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Which best describes a compound such as sodium chloride?
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NOT A mixture of two common elements that can be separated by physical means
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A teacher makes the following statement. "Gasoline boils at a relatively low temperature (about 150°C). The kerosene is removed at around 200°C, followed by diesel oil at 300°C and fuel oil at around 370°C." What topic is the teacher most likely talking about?
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NOT evaporation of a mixture
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Which is a pure substance?
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NOT salt water
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When a drawing made with a black marker gets wet, the marker bleeds and more separates into several colors. What method of separation does this describe?
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NOT filtration
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Which method would be best for separating the components of a mixture that is made from two different liquids?
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distillation
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The table shows the percentages of hydrocarbons that are found in a sample of crude oil. Hydrocarbons Percentage Paraffins 30 Naphthenes 49 Aromatics 15 Asphaltics 6 Based on the given information, what is the best classification for this sample of crude oil?
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NOT a pure compound
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Which cannot be separated into simpler substances?
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element
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Which pure substance can be classified as an element?
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H2
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Which physical method can be used for obtaining a sample of salt from a small beaker of salt water?
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evaporation
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Which is a characteristic of mixtures?
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They can be separated by physical processes.
