Review - Chemistry

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What is a pure substance?

Back

A pure substance is a material that has a constant composition and consistent properties throughout. Examples include elements and compounds.

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How can you determine if an object is made of pure silver?

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By determining the density of the object and comparing it to the known density of pure silver.

Front

What is the best example of a pure substance?

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Gold is a pure substance because it consists of only one type of atom.

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Which pair of elements has the most similar properties?

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Nitrogen (N) and Phosphorus (P) have similar properties because they are in the same group of the periodic table.

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What is a physical change?

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A physical change is a change that affects one or more physical properties of a substance without altering its chemical composition. An example is boiling.

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What is a chemical change?

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A chemical change occurs when a substance transforms into a different substance with different properties, such as burning.

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What is density?

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Density is the mass of a substance divided by its volume, often expressed in grams per cubic centimeter (g/cm³).

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What is an element?

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An element is a pure substance that cannot be broken down into simpler substances by chemical means. Examples include hydrogen, oxygen, and gold.

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What is a compound?

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A compound is a substance formed when two or more elements chemically bond together in fixed proportions, such as water (H2O).

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What is the difference between a mixture and a pure substance?

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A mixture contains two or more substances that are not chemically combined, while a pure substance has a uniform and definite composition.