
Balancing Chemical Equations
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 the reaction.
2.
FLASHCARD QUESTION
Front
What does the Law of Conservation of Mass state?
Back
Matter cannot be gained or lost in a chemical reaction.
3.
FLASHCARD QUESTION
Front
What is the difference between an element and a compound?
Back
An element is a pure substance made of only one type of atom, while a compound is a substance formed when two or more different types of atoms bond together.
4.
FLASHCARD QUESTION
Front
Is the equation 2C2H2 + 5O2 --> 4CO2 + 2H2O balanced?
Back
Yes, it is balanced.
5.
FLASHCARD QUESTION
Front
How many HCl molecules are needed to balance the equation Mg + __HCl --> MgCl2 + H2?
Back
2 HCl molecules are needed.
6.
FLASHCARD QUESTION
Front
What is the purpose of balancing chemical equations?
Back
To ensure that the same number of atoms of each element are present on both sides of the equation, reflecting the conservation of mass.
7.
FLASHCARD QUESTION
Front
What is a reactant in a chemical reaction?
Back
A reactant is a substance that undergoes change during a chemical reaction.
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