Question

masteryconnect
dtal-ch- term 1 - unit 1 assessment - 25-26
a pure substance containing multiple atoms that cannot be changed into a simpler substance except by a chemical reaction.
heterogeneous mixture
element
compound
homogeneous mixture
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Explanation:

1. Analyze each option:

• Heterogeneous mixture: A mixture with non - uniform composition, can be separated physically, not a pure substance. Eliminate.
• Element: A pure substance made of only one type of atom, not multiple atoms. Eliminate.
• Compound: A pure substance made of two or more different atoms (multiple atoms) chemically combined, and can only be broken down by chemical reactions. This fits the description.
• Homogeneous mixture: A mixture with uniform composition, can be separated physically, not a pure substance. Eliminate.

Answer:

C. compound