Balancing Chemical Equations Practice
Flashcard
•
Science
•
8th Grade
•
Practice Problem
•
Hard
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15 questions
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1.
FLASHCARD QUESTION
Front
What is a balanced chemical equation?
Back
A balanced chemical equation has the same number of each type of atom on both sides of the equation, indicating that mass is conserved during a chemical reaction.
2.
FLASHCARD QUESTION
Front
What does the coefficient in a chemical equation represent?
Back
The coefficient indicates the number of molecules or moles of a substance involved in the reaction.
3.
FLASHCARD QUESTION
Front
How do you determine the number of atoms in a compound?
Back
Multiply the subscript of each element by the coefficient in front of the compound. For example, in 3Cr(MnO4)6, there are 3 x 6 = 18 Mn atoms.
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; therefore, the total mass of reactants must equal 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 that the number of atoms for each element is the same on both sides of the equation.
6.
FLASHCARD QUESTION
Front
What is the balanced equation for the reaction of hydrogen and nitrogen to form ammonia?
Back
3 H2 + N2 -> 2 NH3.
7.
FLASHCARD QUESTION
Front
What is the balanced equation for the combustion of sodium chlorate (NaClO3)?
Back
2 NaClO3 -> 2 NaCl + 3 O2.
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