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Formula And Calculations S3 (Unit 1 N5)
Test Description: S3 Chemistry questions on moles formulae etc.
Instructions: Answer all questions to get your test result.
1) What is the formula for magnesium oxide?
A
Mg₂O
B
MgO₂
C
Mg₂O₂
D
MgO
2) What is the formula mass (molecular mass) of barium chloride BaCl₂?
A
172
B
70
C
207
D
137
3) What is the name of the compound SO₂?
A
Sulfur dioxide
B
Sulfur oxygen
C
Sulfur oxide
D
Disulfur monoxide
4) Balance the following equation.... Fe + Cl₂ ---) FeCl₃
A
2 Fe + 3 Cl₂ ---) 2 FeCl₃
B
1 Fe + 3 Cl₂ ---) 1 FeCl₃
C
4 Fe + 6 Cl₂ ---) 4 FeCl₃
D
4 Fe + 3 Cl₂ ---) 4 FeCl₃
5) What is the gram formula mass of Ca(OH)₂?
A
29g
B
34g
C
57g
D
74g
6) What is the concentration of an solution that contains 1.5 moles of NaCl in 500 cm³ of this solution?
A
1.5
B
2
C
3
D
1
7) You have 500cm³ of a 1.2 mol l⁻¹ solution. What would be the concentration if you had only 50 cm³ of the solution?
A
0.60 mol l⁻¹
B
0.12 mol l⁻¹
C
1.2 mol l⁻¹
D
6.0 mol l⁻¹
8) Convert 40.9 grams CaO to moles.
A
56.08
B
1.37
C
15.18
D
0.73
9) How many moles are in 10 grams of He?
A
40
B
10
C
2.5
D
4.00
10) The correct chemical formula for manganese (III) chloride is
A
MgCl₂
B
Mn₃Cl
C
MgCl₃
D
MnCl₃
*select an answer for all questions
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