Chemical Reactions

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What is an exothermic reaction?

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An exothermic reaction is a chemical reaction that releases energy in the form of heat or light.

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What is an endothermic reaction?

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An endothermic reaction is a chemical reaction that absorbs energy from its surroundings, usually in the form of heat.

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What is the difference between a chemical change and a physical change?

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A chemical change creates a new substance, while a physical change does not change the substance's chemical composition.

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What happens during photosynthesis?

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During photosynthesis, plants convert carbon dioxide and water into glucose and oxygen using sunlight, rearranging the atoms to form new molecules.

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What is a reactant in a chemical reaction?

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A reactant is a substance that undergoes a change during a chemical reaction.

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What is a product in a chemical reaction?

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A product is a substance that is formed as a result of a chemical reaction.

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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; the total mass of reactants equals the total mass of products.

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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 in the process.

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What is an example of a gas produced in a chemical reaction?

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An example of a gas produced in a chemical reaction is hydrogen gas, which can be produced when zinc reacts with hydrochloric acid.

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What is combustion?

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Combustion is a chemical reaction that occurs when a substance reacts rapidly with oxygen, producing heat and light.