
Reactions test November 20
Flashcard
•
Chemistry
•
9th - 12th Grade
•
Practice Problem
•
Hard
Wayground Content
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15 questions
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1.
FLASHCARD QUESTION
Front
What is a coefficient in a chemical equation?
Back
A coefficient is a number in front of a chemical formula that indicates how many molecules or atoms of each reactant and product are involved in a reaction.
2.
FLASHCARD QUESTION
Front
Which of the following represents a balanced chemical equation?
Back
2Na + 2H₂O → 2NaOH + H₂ is balanced.
3.
FLASHCARD QUESTION
Front
What happens when sugar dissolves in warm water?
Back
This is a physical change, as the sugar does not create a new substance.
4.
FLASHCARD QUESTION
Front
What is the general reaction scheme for a decomposition reaction?
Back
AB → A + B is the general scheme for a decomposition reaction.
5.
FLASHCARD QUESTION
Front
What defines a chemical change?
Back
A chemical change creates a new substance and cannot be undone.
6.
FLASHCARD QUESTION
Front
What is a reactant in a chemical reaction?
Back
A reactant is a substance that undergoes change during a chemical reaction.
7.
FLASHCARD QUESTION
Front
What is a product in a chemical reaction?
Back
A product is a substance that is formed as a result of a chemical reaction.
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