Lesson 4 -Part 1-percent by mass
Science
1 plays
4 questions
Question 1
Multiple Choice
10 points
Calcium chloride (CaCl2) is sometimes used as a deicer. Calculate the percent by mass of each element in CaCl2. Ca=40.08 Cl=35.45
A.% Ca = 36.1 % , and % Cl= 63.8%
B.% Ca = 25.1 % , and % Cl= 74.9%
C.% Ca = 54.6 % , and % Cl= 45.4%
D.% Ca = 20.1 % , and % Cl= 79.8%
Question 2
Multiple Choice
10 points
Sodium sulfate is used in the manufacture of detergents. A-Identify each of the component elements of sodium sulfate, and write the compoundās chemical formula.
A.Sodium , sulfur , and oxygen , the formula is NaSO4
B.Sodium , sulfur , and hydrogen , the formula is Na2 SO4
C.Sodium , phosphorus , and oxygen , the formula is Na3 SO4
D.Sodium , sulfur , and oxygen , the formula is Na2 SO4
Question 3
Multiple Choice
10 points
Sodium sulfate is used in the manufacture of detergents. B-Identify the compound as ionic or covalent.
A.Both ionic and molecular
B.ionic
C.molecular
D.None of the above
Question 4
Multiple Choice
10 points
Sodium sulfate is used in the manufacture of detergents. C-Calculate the percent by mass of each element in sodium sulfate. Na=22.9 S=32.07 O=16
A.30 % Na , 40 % S , and 30% O
B.14,7 % Na , 67.58 % S , and 21.05 % O
C.32.37 % Na , 22.58 % S , and 45.05 % O
D.44 % Na , 30 % S , and 20.05 % O