UNIT1-conservation of mass Flashcards
1
Q
what is the law of conservation?
A
In a reaction, the total mass of the reactants always equals the total mass of products
2
Q
What is an open system?
A
A system in which gases or other substances can enter or leave during a reaction.
3
Q
What is a closed system?
A
A system where substances cannot leave or enter during a reaction. The total mass in a closed system does not change.
4
Q
What can you use to make a closed system?
A
cotton, wool, stopper
5
Q
What appears to have happened with an open system?
A
It gains mass
6
Q
Why does it appear to have gained mass with an open system?
A
The reactent can sometimes combine with the oxygen in the air
7
Q
What are reactants?
A
They are always on the left side of the equation.
8
Q
What are the products?
A
They are always on the right side of the equation
