Chemical reactions

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What is a chemical reaction?

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A process where substances (reactants) undergo a transformation to form new substances (products).

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What is the law of conservation of mass?

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In a chemical reaction, mass is neither created nor destroyed; it remains constant.

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What is a reactant?

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A substance that undergoes change during a chemical reaction.

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What is a product in a chemical reaction?

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The new substance formed as a result of a chemical reaction.

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What does it mean to balance a chemical equation?

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To ensure that the number of atoms of each element is the same on both sides of the equation.

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What is a coefficient in a chemical equation?

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A number placed in front of a chemical formula to indicate how many molecules are involved.

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What is a subscript in a chemical formula?

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A small number written after an element symbol that indicates the number of atoms of that element in a molecule.

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What is a physical change?

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A change that affects one or more physical properties of a substance without altering its chemical composition.

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What is a chemical change?

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A change that results in the formation of new chemical substances.

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What is an example of a chemical reaction?

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Burning wood, where wood (reactant) transforms into ash and gases (products).