Chemical Changes and Law of Conservation of Mass
Flashcard
•
Science
•
8th Grade
•
Hard
Wayground Content
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15 questions
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1.
FLASHCARD QUESTION
Front
Molecule
Back
A group of atoms bonded together.
2.
FLASHCARD QUESTION
Front
How many Oxygen atoms are in 4H₂O₂?
Back
8
3.
FLASHCARD QUESTION
Front
In a reaction A + B ----> C, reactant A has 5g and product C has 9g. How many grams does reactant B should have?
Back
4g
4.
FLASHCARD QUESTION
Front
Since gases weigh nothing, when they are produced in a reaction they do not have to be accounted for. True or False?
Back
False
5.
FLASHCARD QUESTION
Front
When CaCO₃ is heated, it forms CaO and CO₂. What happens to the mass of the products?
Back
The sum of the products’ masses equals the mass of the CaCO₃.
6.
FLASHCARD QUESTION
Front
What is the Law of Conservation of Mass?
Back
Mass is neither created nor destroyed in a chemical reaction.
7.
FLASHCARD QUESTION
Front
What is a reactant?
Back
A substance that undergoes change during a chemical reaction.
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