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Conservation Of Mass
Test Description: Conservation of Mass Practice
Instructions: Answer all questions to get your test result.
1) If 50 grams of sodium reacts with Cl to form 126 grams of salt. How many grams of Cl reacted?
A
80 grams of Cl
B
50 grams of Cl
C
0 grams of Cl
D
76 grams of Cl
2) If 20 grams of Al reacts with 200 grams of bromide, according to the Law of Conservation of Mass, how many grams of aluminum bromide should be produced?
A
220 grams
B
180 grams
C
400 grams
D
20 grams
3) If 178.8 g of water is separated into hydrogen and oxygen gas, and the hydrogen gas has a mass of 20 g. What is the mass of oxygen produced?
A
158.8 g
B
198.8 g
C
200 g
D
150 g
4) A 10 gram sample of Mg reacts with oxygen to form 16 g of MgO. How many grams of oxygen reacted?
A
16 g
B
6 g
C
26 g
D
60 g
5) Which type of system is best for observing the Law of Conservation of Mass?
A
both
B
neither
C
open
D
closed
6) If a chemical reaction such as photosynthesis begins with 6 atoms of C, how many atoms of C should be present in the products?
A
20 atoms
B
12 atoms
C
2 atoms
D
6 atoms
7) If a reaction produces 24 atoms of oxygen, how many atoms of oxygen were present before the reaction?
A
none the oxygen was created
B
20 atoms
C
24 atoms
D
48 atoms
8) If 10 atoms of K react with 30 atoms of Cl, how many total atoms of KCl will be present in the products?
A
40 atoms
B
20 atoms
C
15 atoms
D
300 atoms
9) If 17 grams of K react with 12 grams of Br, what will be the mass of KBr produced?
A
29 grams
B
10 grams
C
5 grams
D
30 grams
10) The Law of Conservation of Mass states that mass can ...
A
can be created and destroyed
B
cannot be created or destroyed
C
be lost or gained
D
can only be conserved in a closed system
*select an answer for all questions
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