Multiple Choice
In the classification of soil particles, which type is considered the smallest?
1. Intro to General Chemistry
Classification of Matter
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Which of the following statements is true?
A
Compounds can only be broken down by chemical means.
B
Gasoline is a pure substance.
C
Only elements are pure substances.
D
Milk is an example of a homogeneous mixture.
E
Concrete is an example of a homogeneous mixture.
Verified step by step guidance1
Understand the definition of a compound: A compound is a substance formed when two or more chemical elements are chemically bonded together. Compounds can be broken down into simpler substances by chemical means, but not by physical means.
Review the concept of pure substances: Pure substances have a uniform and definite composition. They can be either elements or compounds. Elements are pure substances that cannot be broken down into simpler substances by chemical means.
Examine the nature of gasoline: Gasoline is a mixture of hydrocarbons and other compounds, not a pure substance. It is a homogeneous mixture because its composition is uniform throughout.
Consider the composition of milk: Milk is a colloid, which is a type of homogeneous mixture where the particles are mixed but not dissolved. It appears uniform to the naked eye but contains different substances like water, fats, and proteins.
Analyze the composition of concrete: Concrete is a heterogeneous mixture because it consists of different materials like cement, sand, gravel, and water, which are not uniformly distributed throughout the mixture.
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