We are being asked to classify each of the following molecular diagrams as either a pure substance or a mixture.
Recall: Matter can be classified as either pure substance or mixture.
A pure substance has a single composition. If a pure substance can be separated into simpler substances, it is a compound such as CO2. If it cannot be separated into simpler substances, it is an element such as He, Cl2 and O3.
A mixture has a variable composition. If a mixture does not have a uniform composition, it is heterogeneous such as a mixture of water and oil. If it has a uniform composition, it is homogenous such as air.
Classify each of the following molecular diagrams as a pure substance or a mixture.
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What scientific concept do you need to know in order to solve this problem?
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