Chemistry Chapter 2 Quiz 2 Critical Analysis – Flashcards

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question
Which best describes a compound such as sodium chloride?
answer
NOT A mixture of two common elements that can be separated by physical means
question
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?
answer
NOT evaporation of a mixture
question
Which is a pure substance?
answer
NOT salt water
question
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?
answer
NOT filtration
question
Which method would be best for separating the components of a mixture that is made from two different liquids?
answer
distillation
question
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?
answer
NOT a pure compound
question
Which cannot be separated into simpler substances?
answer
element
question
Which pure substance can be classified as an element?
answer
H2
question
Which physical method can be used for obtaining a sample of salt from a small beaker of salt water?
answer
evaporation
question
Which is a characteristic of mixtures?
answer
They can be separated by physical processes.
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