GCQ: Classification of Matter

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What is a compound?

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A compound is a substance formed when two or more elements are chemically bonded together. Example: Water (H2O) is a compound made of hydrogen and oxygen.

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What is a mixture?

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A mixture is a combination of two or more substances that are not chemically bonded. Example: Air is a mixture of gases.

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What is a homogeneous mixture?

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A homogeneous mixture is a mixture that has a uniform composition throughout. Example: Saltwater is a homogeneous mixture.

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What is a heterogeneous mixture?

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A heterogeneous mixture is a mixture that does not have a uniform composition and the individual components can be seen. Example: Salad is a heterogeneous mixture.

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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. Example: Oxygen (O) is an element.

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What is the difference between a compound and a mixture?

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A compound is made of two or more elements chemically bonded, while a mixture is a physical combination of substances that retain their individual properties.

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What is a suspension?

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A suspension is a heterogeneous mixture in which solid particles are dispersed in a liquid but will settle over time. Example: Muddy water is a suspension.

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What is a colloid?

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A colloid is a mixture where very small particles of one substance are evenly distributed throughout another substance. Example: Milk is a colloid.

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What is the significance of chemical formulas?

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Chemical formulas represent the composition of compounds, showing the elements present and the number of atoms of each element. Example: The formula for glucose is C6H12O6.

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What is the law of definite proportions?

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The law of definite proportions states that a chemical compound always contains its component elements in fixed ratio by mass.