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 (O), Hydrogen (H), and Gold (Au).

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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. An example is Water (H2O), which is made of Hydrogen and Oxygen.

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. Examples include air (a mixture of gases) and salad (a mixture of vegetables).

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What distinguishes a pure substance from a mixture?

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A pure substance consists of only one type of particle (either an element or a compound), while a mixture contains two or more different particles.

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Is salt (NaCl) an element, compound, or mixture?

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Salt (NaCl) is a compound because it is formed from the chemical combination of sodium (Na) and chlorine (Cl).

Tags

NGSS.MS-PS1-1

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Is brass a mixture or a compound?

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Brass is a mixture because it is made by combining two elements, zinc and copper, without a chemical reaction.

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What is the definition of a homogeneous mixture?

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A homogeneous mixture is a mixture that has a uniform composition throughout, such as saltwater.

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What is the definition of a heterogeneous mixture?

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A heterogeneous mixture is a mixture where the components can be seen and are not uniform, such as a salad or a mixture of sand and pebbles.

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What is the chemical formula for baking soda?

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The chemical formula for baking soda is NaHCO3, which is a compound.

Tags

NGSS.MS-PS1-1

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Can a mixture be separated into its components?

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Yes, mixtures can be separated into their components by physical means, such as filtration or distillation.