Multiple Choice
Which of the following substances is classified as an element?
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1. Intro to General Chemistry
Classification of Matter
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Which of the following statements is true about a mixture?
A
A mixture consists of two or more substances that are physically combined and can be separated by physical means.
B
A mixture can only be separated by chemical reactions.
C
A mixture is always homogeneous throughout.
D
A mixture has a fixed composition and definite chemical properties.
Verified step by step guidance1
Understand the definition of a mixture: A mixture is a combination of two or more substances that are physically combined, not chemically bonded.
Recall that mixtures can be separated by physical means such as filtration, distillation, or decantation because the components retain their individual properties.
Recognize that mixtures can be either homogeneous (uniform composition) or heterogeneous (non-uniform composition), so they are not always homogeneous throughout.
Note that mixtures do not have a fixed composition; the ratio of components can vary, unlike pure substances which have definite chemical properties and fixed composition.
Conclude that the true statement about mixtures is that they consist of two or more substances physically combined and can be separated by physical means.
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