Master Chemistry with Premium Notes, Assignments, and Lab Reports – Now Available on Stuvia!
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Course
200.BA
Institution
Collège Ahuntsic (
)
Master Chemistry with Premium Notes, Assignments, and Lab Reports – Now Available on Stuvia!
Are you finding Chemistry to be a challenge? Struggling to keep up with complex reactions, formulas, and lab experiments? You’re not alone, and that’s why I’ve created a collection of top-quality...
MIDTERM 1 – Subject B
GUIDELINES:
Date: Wednesday Oct. 26th, 2022.
- You are authorized pen, draft paper, eraser and a non-programmable calculator.
- You will find a picture of the periodic table, list of names and symbols of elements, the
rules of solubility for ionic compounds, and numerical values of the necessary universal
constants at the end of the booklet.
PART I: Direct Applications (36points)
Short questions which can be directly answered using the notions seen in class. Be careful to
answer the question properly and completely. Write your answers without justification unless
otherwise specified!
1) Fill out the following table. Gray areas should not be filled. (13 points)
Compound Formula Cation Anion Compound Name
formula formula
Ca3(PO4)2 Ca2+ PO43- Calcium phosphate
Ca(CN)2 Ca2+ CN- Calcium cyanide
MnBr3 Mn3+ Br- Manganese(III) bromide
HSCN H+ SCN- Hydrothiocyanic acid
Na2HPO4 Na+ HPO42- Sodium hydrogen phosphate
MgC2O4 Mg2+ C2O42- Magnesium oxalate
NH4C2H3O2 NH4+ C2O42- Ammonium acetate
PBr5 Phosphorus pentabromide
1/6
, Student Name:
2) Indicate whether the following compounds are strong, weak, or non-electrolytes. (4
points)
a. Glucose Non-electrolyte
b. Sodium hydroxide Strong
c. Acetic acid Weak
d. Ethanol Non-electrolyte
3) Progesterone is a hormone involved in the menstrual cycle, pregnancy, and embryogenesis
of humans and other species. Its molecular formula is C21H30O2. What is the percent by
mass of carbon in progesterone? (Write a single line of calculations, 3 points)
4) Which of the following combinations of solutions lead to the formation of a precipitate?
Fill out the following table. (5 points)
Solution A Solution B Does it precipitate? Solid nature
AgNO3 NaCl Yes AgCl
FeCl3 KOH Yes Fe(OH)3
Ba(NO3)2 NH4NO3 No --
Ba(NO3)2 (NH4)2SO4 No BaSO4
Na2S ZnCl Yes ZnS
CrCl2 CdI2 No --
2/6
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