Multiple Choice
Which of the following is a characteristic of all mixtures?
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1. Intro to General Chemistry
Classification of Matter
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Which of the following substances is classified as an element?
A
Carbon dioxide (CO2)
B
Oxygen (O2)
C
Sodium chloride (NaCl)
D
Water (H2O)
Verified step by step guidance1
Understand the definition of an element: An element is a pure substance consisting of only one type of atom, and it cannot be broken down into simpler substances by chemical means.
Analyze each substance given: Carbon dioxide (CO2) is composed of carbon and oxygen atoms chemically bonded, so it is a compound, not an element.
Sodium chloride (NaCl) consists of sodium and chlorine atoms bonded together, making it a compound as well.
Water (H2O) is made of hydrogen and oxygen atoms chemically combined, so it is also a compound.
Oxygen (O2) consists of only oxygen atoms bonded together, meaning it is a molecule of a single element, thus classifying it as an element.
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