3.2: Practice Classifying Matter

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Exercise \(\PageIndex{1}\)

Classify each of the following as an element, a compound, a homogeneous mixture, or a heterogeneous mixture.

a) liquid hand soap (transparent, not creamy)

b) carbonated water (fizzing, not flat)

c) ascorbic acid (also known as vitamin C, C₆H₈O₆)

Answer a: homogeneous mixture (has water, various soap molecules, possibly antimicrobial agents)
Answer b: heterogenous mixture (CO₂ gas bubbles are distinct phase, not uniformly mixed)
Answer c: compound (has chemical formula)

Classify each of the following as an element, a compound, a homogeneous mixture, or a heterogeneous mixture.

d) isopropanol (C₃H₈O)

e) a bottle of 70% isopropanol

f) sulfur

Answer d: compound
Answer e: homogeneous mixture (has 70% isopropanol, 30% water)
Answer f: element

Classify each of the following as an element, a compound, a homogeneous mixture, or a heterogeneous mixture.

g) bronze (metal alloy of copper and tin)

h) silver

i) oxygen gas (O₂)

Answer g: homogeneous mixture
Answer h: element
Answer i: element (some elements exist in nature as diatomic molecules)