What is the Law of Conservation of Mass?
Law Of Conservation of Mass

Flashcard
•
Science
•
7th Grade
•
Hard
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1.
FLASHCARD QUESTION
Front
Back
The Law of Conservation of Mass states that in a closed system, the total mass of reactants before a chemical reaction is equal to the total mass of products after the reaction. Matter cannot be created or destroyed.
2.
FLASHCARD QUESTION
Front
If a reaction starts with 20g of reactants, how much mass should the products have?
Back
The products should have a total mass of 20g.
3.
FLASHCARD QUESTION
Front
What happens to matter during a chemical reaction according to the Law of Conservation of Mass?
Back
Matter is transformed or changed, but the total mass remains constant.
4.
FLASHCARD QUESTION
Front
What is an open system in terms of matter and energy exchange?
Back
An open system is one that can exchange both matter and energy with its surroundings.
5.
FLASHCARD QUESTION
Front
What is a closed system in terms of matter and energy exchange?
Back
A closed system can exchange energy but not matter with its surroundings.
6.
FLASHCARD QUESTION
Front
In a combustion reaction, which element is always a reactant?
Back
Oxygen is always a reactant in a combustion reaction.
7.
FLASHCARD QUESTION
Front
What is an example of a chemical reaction where mass decreases?
Back
When a substance is heated in an open container, some particles may escape as gas, leading to a decrease in mass.
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