2024 - Fall Final Exam Modified Review

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What is a homogeneous mixture?

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A homogeneous mixture is a mixture in which the composition is uniform throughout. An example is coffee.

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What makes atoms stable?

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Atoms are most stable when their outer shell is complete, meaning they have a full set of electrons.

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What are Halogens?

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Halogens are a group of elements in Group 17 of the periodic table, known for their reactivity and include elements like fluorine and chlorine.

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What is a chemical property?

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A chemical property is a characteristic of a substance that can only be observed during a chemical reaction, such as flammability.

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What is the Lewis Dot Structure for ammonia (NH3)?

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The Lewis Dot Structure for ammonia shows nitrogen in the center with three hydrogen atoms bonded to it, and a lone pair of electrons on nitrogen.

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What is an example of a physical property?

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An example of a physical property is color, boiling point, or melting point.

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What distinguishes a chemical change from a physical change?

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A chemical change results in the formation of new substances, while a physical change does not alter the chemical composition of a substance.

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What are alkali metals?

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Alkali metals are the elements in Group 1 of the periodic table, known for being highly reactive and include lithium, sodium, and potassium.

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What is the significance of the outer electron shell in atoms?

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The outer electron shell determines an atom's reactivity and stability; atoms tend to react to achieve a full outer shell.

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What is a mixture?

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A mixture is a combination of two or more substances where each retains its own properties.