Balancing Chemical Equations Quiz
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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.

<p>coefficients</p> Signup and view all the answers

What does the Law of Conservation of Mass state?

<p>It states that substances cannot be created or destroyed; the mass of reactants must be equal to the mass of products.</p> Signup and view all the answers

What is a Scientific Law?

<p>A generalization about how the physical universe works.</p> Signup and view all the answers

What is Mass?

<p>The amount of matter a substance has.</p> Signup and view all the answers

What is weight?

<p>Changes depending on how much gravity is present.</p> Signup and view all the answers

What is a chemical formula?

<p>A shorthand way to use element symbols and numbers to represent a substance.</p> Signup and view all the answers

What is a chemical equation?

<p>Representation of a chemical reaction that uses chemical formulas to show relationships between the reactants and products.</p> Signup and view all the answers

What are reactants?

<p>Starting materials in a chemical equation.</p> Signup and view all the answers

What are products?

<p>Substances formed from a chemical reaction.</p> Signup and view all the answers

What is a subscript?

<p>A number written below and to the right of an element's symbol in a chemical formula to denote the number of that atom present.</p> Signup and view all the answers

What is a coefficient?

<p>A number that is placed in front of a chemical formula.</p> Signup and view all the answers

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!

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