Which Is the Best Definition of a Pure Substance

question 68

Multiple Choice

Which is the best definition of a pure substance?

• A) A material that contains two or more types of atoms
• B) A material in the gas phase
• C) A material whose properties cannot be changed by further physical separation
• D) A material whose properties have been measured
• E) A material that has been heated

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Definitions:

Additive Strategy

A problem-solving technique that involves systematically adding all possible elements together to find a solution.

Representativeness Heuristic

A cognitive shortcut that involves judging the probability of an event by how much it resembles what we consider to be a typical example of that event.

Availability Heuristic

A quick-thinking process that depends on the first examples that pop into someone's head when they are considering a particular subject, idea, approach, or choice.

Relative Comparisons

The act of evaluating something in relation to another similar item.