Chemistry Chapter 2 Quiz 2

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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