Chemical Reactions

Front

What is a chemical reaction?

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A process where reactants are transformed into products through the rearrangement of atoms.

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What are reactants in a chemical reaction?

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Substances that undergo change during a chemical reaction.

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What are products in a chemical reaction?

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Substances that are formed as a result of a chemical reaction.

Front

What does the law of conservation of mass state?

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

Front

What is the role of coefficients in a chemical equation?

Back

Coefficients indicate the number of molecules or moles of a substance involved in a reaction.

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What do subscripts in a chemical formula represent?

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Subscripts indicate the number of atoms of each element in a molecule.

Front

What is a balanced chemical equation?

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An equation where the number of atoms for each element is the same on both sides of the reaction.

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What is an example of a chemical reaction?

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Combustion of methane: CH₄ + 2O₂ → CO₂ + 2H₂O.

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What is meant by 'rearrangement of atoms' in a chemical reaction?

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Atoms in reactants are reorganized to form new products.

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What is an endothermic reaction?

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A reaction that absorbs energy from its surroundings.