Multiple Choice
Which of the following gases is not considered a main type of greenhouse gas?
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 an example of a pure substance?
A
Air
B
Sand
C
Saltwater
D
Copper metal
Verified step by step guidance1
Understand the definition of a pure substance: A pure substance is a material that has a constant composition and has consistent properties throughout the sample. It can be an element or a compound.
Identify the characteristics of each option: Air is a mixture of gases, sand is a mixture of different minerals, and saltwater is a mixture of salt and water. Copper metal, however, is an element and thus a pure substance.
Recognize that elements are pure substances because they consist of only one type of atom. Copper (Cu) is an element found on the periodic table.
Consider compounds as pure substances as well, but in this case, copper is an element, not a compound. Compounds are made of two or more elements chemically bonded together.
Conclude that among the given options, copper metal is the only example of a pure substance because it is an element with a uniform composition throughout.
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