Classifying and Balancing Equations
Flashcard
•
Chemistry
•
10th Grade
•
Practice Problem
•
Hard
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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 the reaction.
2.
FLASHCARD QUESTION
Front
How do you determine the number of oxygen atoms in a compound like Al₂(SO₄)₃?
Back
Count the oxygen atoms in the sulfate ion (SO₄) which has 4 oxygen atoms, and since there are 3 sulfate ions in Al₂(SO₄)₃, multiply 4 by 3 to get 12 oxygen atoms.
3.
FLASHCARD QUESTION
Front
What does it mean if an equation is not balanced?
Back
It means that the number of atoms of at least one element is different on the reactant side compared to the product side, violating the law of conservation of mass.
4.
FLASHCARD QUESTION
Front
How do you balance the equation HgO → 2Hg + O₂?
Back
You need to add a coefficient of 2 in front of HgO to balance the equation: 2HgO → 2Hg + O₂.
5.
FLASHCARD QUESTION
Front
What is the coefficient needed to balance the equation Mg + __HCl → MgCl₂ + H₂?
Back
You need a coefficient of 2 in front of HCl to balance the equation: Mg + 2HCl → MgCl₂ + H₂.
6.
FLASHCARD QUESTION
Front
What is the purpose of coefficients in a chemical equation?
Back
Coefficients indicate the number of molecules or moles of a substance involved in the reaction, helping to balance the equation.
7.
FLASHCARD QUESTION
Front
How do you identify the reactants and products in a chemical equation?
Back
Reactants are the substances that undergo a chemical change, found on the left side of the equation, while products are the substances formed, found on the right side.
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