Chemical Reactions and Atoms

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What is a chemical reaction?
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A chemical reaction is a process where one or more substances are converted into new substances with different properties.
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What role do atoms play in chemical reactions?
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Atoms are rearranged during chemical reactions, breaking old bonds and forming new ones.
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What is the law of conservation of mass?
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The law of conservation of mass states that mass is neither created nor destroyed in a chemical reaction.
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What is meant by reactants?
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Reactants are the substances present at the start of a chemical reaction, which are transformed into products.
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What are products in a chemical reaction?
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Products are the new substances formed as a result of a chemical reaction.
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What is a chemical bond?
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A chemical bond is a force that holds atoms together in a substance, often involving the sharing or transfer of electrons.
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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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Why do elements react in specific ratios?
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Elements react in specific ratios to fulfill the octet rule, achieving a stable electron configuration.
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What is an exothermic reaction?
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An exothermic reaction is one that releases energy, usually in the form of heat, to the surroundings.
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What is an endothermic reaction?
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An endothermic reaction absorbs energy from the surroundings, often in the form of heat.
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What is an example of a real-life chemical reaction?
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The rusting of iron is an example: 4Fe + 3O₂ → 2Fe₂O₃.
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Why is the knowledge of chemical reactions important?
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Understanding chemical reactions is essential for developing new materials, medicines, fuels, and understanding natural processes.
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What is a catalyst?
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A catalyst is a substance that speeds up a chemical reaction without being consumed by the reaction.
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How does a balanced chemical equation relate to the conservation of mass?
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A balanced chemical equation has the same number of atoms of each element on both sides, demonstrating the conservation of mass.
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What effect does temperature have on chemical reactions?
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Increasing temperature generally increases the reaction rate, as it provides more energy for collisions between reacting particles.
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