Multiple Choice
Which of the following is a pure substance?
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1. Intro to General Chemistry
Classification of Matter
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The drawing shows two water molecules. Which statement is correct?
A
Each water molecule is a pure substance composed of two hydrogen atoms and one oxygen atom.
B
Each water molecule contains two oxygen atoms and one hydrogen atom.
C
The two water molecules together form a heterogeneous mixture.
D
Water molecules are classified as elements.
Verified step by step guidance1
Identify the composition of a single water molecule by recalling its chemical formula, which is H\_2O, meaning each molecule contains two hydrogen atoms and one oxygen atom.
Understand that a pure substance consists of only one type of molecule or compound, so each water molecule is a pure substance made up of H\_2O molecules.
Recognize that water molecules do not contain two oxygen atoms; they have only one oxygen atom bonded to two hydrogen atoms.
Know that a mixture involves two or more different substances physically combined, so two water molecules together do not form a mixture but remain the same pure substance.
Recall that elements are substances made of only one type of atom, whereas water molecules are compounds made of different atoms chemically bonded, so water molecules are not elements.
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