Elements, Compounds, & Mixtures

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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 oxygen, gold, and hydrogen.

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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. Examples include water (H2O) and carbon dioxide (CO2).

Tags

NGSS.MS-PS1-1

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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. The individual substances retain their properties. Examples include air and salad.

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What is the difference between a mixture and a compound?

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A mixture consists of two or more substances that are physically combined, while a compound consists of two or more elements that are chemically bonded.

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What is an example of a homogeneous mixture?

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An example of a homogeneous mixture is saltwater, where the salt is evenly distributed throughout the water.

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What is an example of a heterogeneous mixture?

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An example of a heterogeneous mixture is a salad, where the individual ingredients can be seen and separated.

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What does it mean for matter to have mass and take up space?

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Matter is anything that has mass (weight) and occupies space (volume). This includes solids, liquids, and gases.

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What is the definition of a solution?

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A solution is a type of homogeneous mixture where one substance (the solute) is dissolved in another (the solvent). An example is sugar dissolved in water.

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What is the law of conservation of mass?

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The law of conservation of mass states that mass is neither created nor destroyed in a chemical reaction; it is conserved.

Tags

NGSS.MS-PS1-5

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What is an example of an element found in nature?

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An example of an element found in nature is oxygen, which is essential for respiration in living organisms.