Chemical Equations

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What is a chemical equation?

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A chemical equation is a symbolic representation of a chemical reaction, showing the reactants and products along with their quantities.

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NGSS.MS-PS1-5

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What are reactants in a chemical equation?

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Reactants are the starting substances in a chemical reaction that undergo change.

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NGSS.MS-PS1-5

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What are products in a chemical equation?

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Products are the substances formed as a result of a chemical reaction.

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NGSS.MS-PS1-1

NGSS.MS-PS1-5

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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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NGSS.MS-PS1-5

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How do you determine the number of atoms in a molecule?

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The number of atoms in a molecule can be determined by looking at the subscripts in the chemical formula.

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NGSS.MS-PS1-1

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In the formula 4NH₃, how many Nitrogen (N) atoms are present?

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4 Nitrogen (N) atoms.

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NGSS.MS-PS1-1

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In the formula 4NH₃, how many Hydrogen (H) atoms are present?

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12 Hydrogen (H) atoms.

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NGSS.MS-PS1-1

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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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NGSS.MS-PS1-5

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What is a synthesis reaction?

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A synthesis reaction is a type of chemical reaction where two or more reactants combine to form a single product.

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NGSS.MS-PS1-1

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What is a decomposition reaction?

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A decomposition reaction is a type of chemical reaction where a single compound breaks down into two or more simpler products.