What is a balanced chemical equation?
Balancing Chemical Equations

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•
Science
•
9th Grade
•
Hard
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1.
FLASHCARD QUESTION
Front
Back
A balanced chemical equation has equal numbers of each type of atom on both sides of the equation, following the law of conservation of mass.
2.
FLASHCARD QUESTION
Front
What does a coefficient in a chemical equation represent?
Back
A coefficient indicates the number of molecules or moles of a substance involved in a reaction.
3.
FLASHCARD QUESTION
Front
How do you determine the number of atoms in a molecule?
Back
Count the subscripts in the chemical formula; if there is no subscript, it is assumed to be 1.
4.
FLASHCARD QUESTION
Front
What is the law of conservation of mass?
Back
The law states that mass is neither created nor destroyed in a chemical reaction; the total mass of reactants equals the total mass of products.
5.
FLASHCARD QUESTION
Front
How do you balance a chemical equation?
Back
Adjust the coefficients of the reactants and products to ensure the same number of each type of atom on both sides.
6.
FLASHCARD QUESTION
Front
What is the balanced equation for the reaction of PCl5 with H2O?
Back
PCl5 + 4 H2O → 5 HCl + H3PO4.
7.
FLASHCARD QUESTION
Front
What is the balanced equation for the reaction of Mg with HCl?
Back
Mg + 2 HCl → MgCl2 + H2.
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