Multiple Choice
Which of the following is NOT true about mixtures?
3
views
1. Intro to General Chemistry
Classification of Matter
Struggling with General Chemistry?
Join thousands of students who trust us to help them ace their exams!Watch the first videoMultiple Choice
Which of the following is best classified as a mixture?
A
Pure water (H_2O)
B
Carbon dioxide (CO_2)
C
Sodium chloride (NaCl)
D
Air
Verified step by step guidance1
Understand the difference between a pure substance and a mixture. A pure substance has a fixed composition and distinct chemical properties, while a mixture contains two or more substances physically combined without fixed proportions.
Examine each option: Pure water (H_2O) is a compound with a fixed chemical formula, so it is a pure substance.
Carbon dioxide (CO_2) is also a compound with a fixed chemical formula, making it a pure substance as well.
Sodium chloride (NaCl) is an ionic compound with a definite composition, so it is a pure substance.
Air is a combination of different gases (mainly nitrogen, oxygen, and small amounts of other gases) physically mixed together without fixed proportions, so it is best classified as a mixture.
1:44mWatch next
Master Introduction to General Chemistry Course with a bite sized video explanation from Jules
Start learningRelated Videos
Related Practice
Classification of Matter practice set
Problem sets built by lead tutorsExpert video explanations