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Classify each of the following as an element, a compound, or a mixture: (3.1)b. a salad dressing of oil and vinegar
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1. Matter and Measurements
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: Compounds are substances formed when two or more elements are chemically bonded together. They can only be broken down into simpler substances by chemical means, not physical means.
Review the concept of pure substances: Pure substances have a uniform and definite composition. Elements and compounds are both considered pure substances because they have consistent properties throughout.
Examine the nature of gasoline: Gasoline is a mixture of different hydrocarbons and additives, making it a homogeneous mixture rather than a pure substance.
Consider the composition of milk: Milk is a colloid, which is a type of heterogeneous mixture where the components are not uniformly distributed, even though it may appear uniform to the naked eye.
Analyze the composition of concrete: Concrete is a heterogeneous mixture composed of cement, water, sand, and gravel, where the different components are not uniformly distributed.
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