Chemical Equations

Front

What is a chemical equation?

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A chemical equation is a symbolic representation of a chemical reaction, showing the reactants and products along with their quantities.

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What does the coefficient in a chemical formula represent?

Back

The coefficient indicates the number of molecules or moles of a substance in a chemical reaction.

Front

How many atoms are in one molecule of water (H₂O)?

Back

There are 3 atoms in one molecule of water: 2 hydrogen (H) atoms and 1 oxygen (O) atom.

Front

What is the Law of Conservation of Matter?

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The Law of Conservation of Matter states that matter cannot be created or destroyed in a chemical reaction; it only changes form.

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What is an element?

Back

An element is a pure substance that cannot be broken down into simpler substances by chemical means.

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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.

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How do you balance a chemical equation?

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To balance a chemical equation, adjust the coefficients of the reactants and products to ensure the same number of each type of atom on both sides.

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What is the difference between a molecule and an atom?

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An atom is the smallest unit of an element, while a molecule is a group of two or more atoms bonded together.

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What does it mean if a chemical reaction is exothermic?

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An exothermic reaction is a chemical reaction that releases energy, usually in the form of heat.

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What does it mean if a chemical reaction is endothermic?

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An endothermic reaction is a chemical reaction that absorbs energy from its surroundings.