Chemical Formulas, Equations & Reactions

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What is a compound?

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A compound is a substance formed when two or more elements are chemically bonded together. For example, water (H2O) is a compound made of hydrogen and oxygen.

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What does the Law of Conservation of Mass state?

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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

How many atoms are in the equation 6CO2 + 6H2O?

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There are 36 atoms in the equation 6CO2 + 6H2O. (6 C + 12 O + 12 H = 36 total atoms).

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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. For example, 2H2 + O2 -> 2H2O is balanced.

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What indicates a chemical reaction has occurred when mixing hydrochloric acid and baking soda?

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The formation of bubbles indicates a chemical reaction has occurred when hydrochloric acid is mixed with baking soda.

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 reaction?

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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 reaction?

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

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What is the significance of coefficients in a chemical equation?

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Coefficients indicate the number of molecules or moles of a substance involved in a chemical reaction, helping to balance the equation.

Front

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

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A physical change alters the form of a substance but not its chemical composition, while a chemical change results in the formation of new substances.