Element Compound Mixture

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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. It consists of only one type of atom. Examples include hydrogen (H), oxygen (O), 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 different elements chemically bond together in fixed proportions. 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 own properties. Examples include air and salad.

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What is a homogeneous mixture?

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A homogeneous mixture is a mixture that has a uniform composition throughout. The different components are not distinguishable. Examples include saltwater and vinegar.

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What is a heterogeneous mixture?

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A heterogeneous mixture is a mixture where the components are not uniformly distributed and can be easily distinguished. Examples include a salad and a bowl of mixed nuts.

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How can you identify an element?

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An element can be identified by its unique atomic number, which is the number of protons in its nucleus. Each element has a distinct set of properties.

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What is the chemical formula for a compound?

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The chemical formula for a compound shows the elements present and the number of atoms of each element. For example, the formula for water is H2O, indicating 2 hydrogen atoms and 1 oxygen atom.

Tags

NGSS.MS-PS1-1

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What is the difference between a compound and a mixture?

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A compound is formed by the chemical combination of elements, while a mixture is a physical combination of substances that retain their individual properties.

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Can elements exist in different forms?

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Yes, elements can exist in different forms known as allotropes. For example, carbon can exist as graphite, diamond, or fullerenes.

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What is an example of a compound?

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An example of a compound is sodium chloride (NaCl), commonly known as table salt, which is formed from sodium (Na) and chlorine (Cl) elements.

Tags

NGSS.MS-PS1-1