GCQ: Properties of Matter

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What is a chemical change?

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A chemical change is a process where one or more substances are transformed into different substances with new chemical properties.

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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.

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What does it mean when a solution turns pink with phenolphthalein?

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It indicates that the solution has become basic (alkaline), suggesting a chemical change has occurred.

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What is precipitation in chemistry?

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Precipitation is the formation of a solid from a solution when two liquids are mixed, resulting in an insoluble product.

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What is fizzing in a chemical reaction?

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Fizzing is the formation of gas bubbles during a chemical reaction, often indicating a chemical change.

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What is solubility?

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Solubility is the ability of a substance to dissolve in a solvent, forming a solution.

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What is an acid-base indicator?

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An acid-base indicator is a substance that changes color in response to the pH level of a solution, indicating whether it is acidic or basic.

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What is the difference between a physical and a chemical change?

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A physical change alters the appearance or state of a substance without changing its chemical composition, while a chemical change results in the formation of new substances.

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What is the significance of observing large crystals after evaporation?

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The formation of large crystals after evaporation indicates a physical change where the solvent has evaporated, leaving behind the solute.

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What is the role of temperature in evaporation?

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Temperature affects the rate of evaporation; higher temperatures increase the kinetic energy of molecules, leading to faster evaporation.