Elements and Compounds Review

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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. Each element is made up of atoms that have the same number of protons.

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What is a compound?

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A compound is a substance formed when two or more different elements are chemically bonded together. Compounds have unique properties that are different from the individual elements.

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How can you identify the number of different elements in a compound?

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You can identify the number of different elements in a compound by counting the number of capital letters in its chemical formula.

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What is the chemical formula for water?

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The chemical formula for water is H2O, which indicates it is made of two hydrogen atoms and one oxygen atom.

Front

What is the most abundant element in the Earth's crust?

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Oxygen is the most abundant element in the Earth's crust.

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What is the role of oxygen in living organisms?

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Oxygen is essential for respiration in living organisms, allowing them to convert food into energy.

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What is the difference between an element and a compound?

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An element is a single type of atom, while a compound consists of two or more different types of atoms chemically bonded together.

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What is the significance of the periodic table?

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The periodic table organizes all known elements based on their atomic number, electron configuration, and recurring chemical properties.

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What is a chemical bond?

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A chemical bond is the force that holds atoms together in a compound. The main types of chemical bonds are ionic and covalent bonds.

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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 made of sodium and chlorine.