How many atoms of nitrogen (N) are in the equation: 2Co(NO₃)₂?
Chemical Reactions Retake Test

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Science
•
8th Grade
•
Hard
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15 questions
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1.
FLASHCARD QUESTION
Front
Back
4
2.
FLASHCARD QUESTION
Front
What is the definition of an independent variable?
Back
The variable that we change on purpose.
3.
FLASHCARD QUESTION
Front
Balance the chemical equation: ___ Al + ___ O₂ -> ___ Al₂O₃
Back
4,3,2
4.
FLASHCARD QUESTION
Front
What is NOT an example of a physical change?
Back
A piece of paper catching fire and turning into ash.
5.
FLASHCARD QUESTION
Front
How many oxygen atoms are in the chemical formula: 3Fe₂O₄?
Back
12
6.
FLASHCARD QUESTION
Front
What is a chemical reaction?
Back
A process where substances (reactants) transform into new substances (products).
7.
FLASHCARD QUESTION
Front
What is the law of conservation of mass?
Back
Mass is neither created nor destroyed in a chemical reaction.
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