Unit 1.2 Test Part 2 2024

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What are physical properties?

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Physical properties are characteristics of a substance that can be observed or measured without changing the substance's chemical identity. Examples include color, hardness, malleability, solubility, electrical conductivity, density, melting point, and boiling point.

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What is a colloid?

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A colloid is a type of mixture where tiny particles are dispersed throughout a substance but do not settle out. Colloids exhibit the Tyndall effect, which is the scattering of light.

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What is an example of a physical change?

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An example of a physical change is honey dissolving in tea, as it involves a change in state but not in chemical composition.

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What is a compound?

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A compound is a substance formed when two or more elements chemically combine in fixed proportions, resulting in new properties.

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What is distillation?

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Distillation is a separation process that involves boiling a liquid to create vapor and then cooling the vapor to create a liquid, effectively separating components based on their boiling points.

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What are chemical properties?

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Chemical properties are characteristics that describe a substance's ability to undergo chemical changes, such as reactivity with acids, flammability, and oxidation states.

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What is the difference between a homogeneous mixture and a heterogeneous mixture?

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A homogeneous mixture has a uniform composition throughout (e.g., saltwater), while a heterogeneous mixture has a non-uniform composition with distinct phases (e.g., salad).

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What is the Tyndall effect?

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The Tyndall effect is the scattering of light by particles in a colloid or in very fine suspensions, which makes the path of the light beam visible.

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What is an example of a chemical change?

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An example of a chemical change is sugar and oxygen reacting to produce water and carbon dioxide, as it involves a change in chemical composition.

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What is solubility?

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Solubility is the ability of a substance to dissolve in a solvent, typically expressed in terms of concentration.