Questions and Answers
Why must chemical equations be balanced?
They must obey the Law of Conservation of Mass that states that matter cannot be created or destroyed; it is conserved. Atoms are never lost or gained in chemical reactions, they are rearranged. The mass of the reactants must equal the mass of the products.
____ stays the same no matter where you are.
mass
If a symbol has no _____, only ______ atom of that element is present.
subscript, one
Only ____ are changed when balancing equations.
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What does the Law of Conservation of Mass state?
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What is a Scientific Law?
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What is Mass?
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What is weight?
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What is a chemical formula?
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What is a chemical equation?
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What are reactants?
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What are products?
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What is a subscript?
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What is a coefficient?
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Study Notes
Balancing Chemical Equations
- Chemical equations must be balanced to comply with the Law of Conservation of Mass, meaning matter can't be created or destroyed, only rearranged.
- The mass of reactants in a chemical reaction must equal the mass of the products.
- Mass remains constant regardless of location, while weight varies due to the influence of gravity.
- If a chemical symbol has no subscript, it indicates that only one atom of that element is present.
- Only coefficients are adjusted when balancing chemical equations; subscripts should remain unchanged.
- A scientific law is a generalization concerning the workings of the physical universe.
- Mass refers to the quantity of matter within a substance, independent of external forces.
- A chemical formula uses element symbols and numbers to succinctly represent a chemical substance.
- A chemical equation illustrates a chemical reaction, showing the relationship between reactants and products with their chemical formulas.
- Reactants are the initial materials involved in a chemical reaction, while products are the substances that result from the reaction.
- A subscript is a numerical notation located below and to the right of an element's symbol, indicating the number of atoms of that element in a compound.
- A coefficient is a number placed before a chemical formula to indicate how many units of that compound are present.
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Description
Test your knowledge on balancing chemical equations and the Law of Conservation of Mass. This quiz covers essential concepts including the roles of reactants and products in a chemical reaction and the importance of using coefficients correctly. Challenge yourself and reinforce your understanding of chemical formulas and equations!
