Unit 8 Test Review: Chemical Equations

Front

What is a chemical equation?

Back

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

Front

What are reactants in a chemical equation?

Back

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

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What are products in a chemical equation?

Back

Products are the substances 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.

Front

What is the purpose of balancing a chemical equation?

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Balancing a chemical equation ensures that the number of atoms for each element is the same on both sides of the equation, adhering to the law of conservation of mass.

Front

What are coefficients in a chemical equation?

Back

Coefficients are the numbers placed before the formulas in a chemical equation to indicate the number of molecules or moles of each substance.

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What are subscripts in a chemical formula?

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Subscripts are the small numbers written after an element's symbol in a chemical formula that indicate the number of atoms of that element in a molecule.

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How do you balance the equation: H₂ + O₂ → H₂O?

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The balanced equation is 2H₂ + O₂ → 2H₂O.

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What is a word equation?

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A word equation is a way of representing a chemical reaction using the names of the reactants and products instead of chemical formulas.

Front

Translate the word equation: Sodium + Chlorine → Sodium Chloride.

Back

The chemical equation is 2Na + Cl₂ → 2NaCl.