Chemical Reactions

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What is a chemical reaction?

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A process where substances (reactants) are transformed into new substances (products) with different properties.

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What does it mean for a chemical equation to be balanced?

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A balanced chemical equation has the same number of each type of atom on both sides, indicating that mass is conserved.

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What is a symbol in chemistry?

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A one or two-letter representation of an element, such as H for Hydrogen or O for Oxygen.

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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, e.g., getting a haircut.

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What is a compound?

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A substance formed when two or more elements chemically bond together, such as H2O (water).

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What is a chemical change?

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A change that results in the formation of new chemical substances, such as rusting of iron.

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What is a reactant?

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A substance that undergoes a chemical change in a reaction.

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What is a product in a chemical reaction?

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

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What is the yield sign in a chemical equation?

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The arrow (→) that indicates the direction of the reaction, separating reactants from products.

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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 or moles of that substance are involved.