Formula And Calculations S3 (Unit 1 N5) Question Preview (ID: 62467)


S3 Chemistry Questions On Moles Formulae Etc. TEACHERS: click here for quick copy question ID numbers.

What is the formula for magnesium oxide?
a) MgO
b) MgO₂
c) Mg₂O
d) Mg₂O₂

What is the formula mass (molecular mass) of barium chloride BaCl₂?
a) 137
b) 172
c) 70
d) 207

What is the name of the compound SO₂?
a) Sulfur oxide
b) Sulfur oxygen
c) Disulfur monoxide
d) Sulfur dioxide

Balance the following equation.... Fe + Cl₂ ---) FeCl₃
a) 2 Fe + 3 Cl₂ ---) 2 FeCl₃
b) 4 Fe + 6 Cl₂ ---) 4 FeCl₃
c) 1 Fe + 3 Cl₂ ---) 1 FeCl₃
d) 4 Fe + 3 Cl₂ ---) 4 FeCl₃

What is the gram formula mass of Ca(OH)₂?
a) 29g
b) 74g
c) 57g
d) 34g

What is the concentration of an solution that contains 1.5 moles of NaCl in 500 cm³ of this solution?
a) 1
b) 3
c) 2
d) 1.5

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) 1.2 mol l⁻¹
b) 0.12 mol l⁻¹
c) 0.60 mol l⁻¹
d) 6.0 mol l⁻¹

Convert 40.9 grams CaO to moles.
a) 56.08
b) 1.37
c) 0.73
d) 15.18

How many moles are in 10 grams of He?
a) 4.00
b) 40
c) 2.5
d) 10

The correct chemical formula for manganese (III) chloride is
a) MgCl₃
b) Mn₃Cl
c) MgCl₂
d) MnCl₃

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