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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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3. Matter and Energy
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 only be broken down into simpler substances by chemical means, not physical means.
Review the definition of a pure substance: A pure substance has a uniform and definite composition. It can be an element or a compound. Gasoline is a mixture of different hydrocarbons, not a pure substance.
Clarify the concept of pure substances: Pure substances include both elements and compounds. Elements are pure substances that cannot be broken down into simpler substances by chemical means.
Examine the nature of milk: Milk is a heterogeneous mixture because it contains different components like water, fats, proteins, and lactose that are not uniformly distributed.
Analyze the composition of concrete: Concrete is a heterogeneous mixture because it consists of different materials like cement, sand, gravel, and water that are not uniformly distributed.
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