Balancing Chemical Equations

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What is a physical change?

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A physical change is a change that affects one or more physical properties of a substance without altering its chemical composition. Examples include changes in state (like melting or freezing) and changes in shape or size.

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NGSS.MS-PS1-4

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What is a chemical change?

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A chemical change is a change that results in the formation of new chemical substances. It involves the breaking and forming of bonds between atoms. Examples include rusting of iron and burning of wood.

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What is the law of conservation of mass?

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The law of conservation of mass states that in a closed system, the mass of the reactants must equal the mass of the products. This means that matter cannot be created or destroyed in a chemical reaction.

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What happens to the mass of reactants and products in a chemical reaction?

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The mass of the reactants before the reaction is equal to the mass of the products after the reaction, as per the law of conservation of mass.

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What is a reactant?

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A reactant is a substance that undergoes a chemical change in a reaction. Reactants are found on the left side of a chemical equation.

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NGSS.MS-PS1-2

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What is a product?

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A product is a substance that is formed as a result of a chemical reaction. Products are found on the right side of a chemical equation.

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NGSS.MS-PS1-2

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What is a balanced chemical equation?

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

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NGSS.MS-PS1-5

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What does it mean to balance a chemical equation?

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Balancing a chemical equation involves adjusting the coefficients of the reactants and products to ensure that the number of atoms for each element is the same on both sides of the equation.

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NGSS.MS-PS1-5

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What is a coefficient in a chemical equation?

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A coefficient is a number placed in front of a chemical formula in an equation to indicate how many molecules or moles of that substance are involved in the reaction.

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NGSS.MS-PS1-5

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What is a subscript in a chemical formula?

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A subscript is a number written below and to the right of a chemical symbol in a formula, indicating the number of atoms of that element in a molecule.