An unknown compound is found to contain only carbon, hydrogen and oxygen. Complete combustion of a 10.38 mg sample of the compound yielded 16.01 mg of CO2 and 4.37 mg of H2O. The molar mass of the compound is 176.1 g/mol. i. How many mg of each o
63. e) Balance the following redox reaction in basic solution: CrI3 + Cl2 CrO42- + IO4- + Cl-
First, we must assign oxidation states for all the atoms. Reactants: For CrI3; the oxidation states are Cr = +3, and I = -1 For Cl2; the oxidation states are Cl
Stoichiometry Problems This is the determination of quantitites of a component in a chemical reaction when given the quantity of another component. one must have a balanced equation before one starts. So first step is always to write the balancedequation
Name: ___.._..______ Student Number:
UNIVERSITY OF TORONTO AT MISSISSAUGA
AprillMay Examinations 2005
Duration 3 hours
Aids Allowed: non-programmable calculators only
Notes to students: Enter your name and student number on ea
Chem Lec Oct 20th
Hybtridization of atomic oribitals
-VSPER theory explains the shape of molecs.
-to form an covalent bond, you need unpaired e-
-carbon can a mocule CH2
-carbon w/h H is CH4 (mostly formed)-more bonds than CH2 therefore more energy is rel
chem lecture oct 10
-quantum numbers is like an address
-each and every e has every dif. set of quatum number
-learn l, n, m, s
-at least one should be diff.
-hund's rule -rem how ppl. sit on the bus
-molecules and complex ions
Lec 14 Oct 8
-MRI due to quatum mechanics
-Learn d number things
-as the number of e-s
-energy is lower for Na than Li
the energy drops down
-when u move left to right, the size decreases
oritibitals coming closer, so energy decreases
-light falls on me
Things to know for Chem
-know to how to dervie equation for wave theory
-should have a definite vaules
-learn how to dxy oribitals
-oribtial spherical in nature, no angular component, only r component
- p oribitasl, angular comp
Lec Nov 7
-HF is stronger than H2O b/c greater diff. in electro.
-but h20 got a higher boiling bc stronger intermolecular forces
-know the sheet abt force, energy, e.g
LF plays a major role than dipolar forces
CF3 of BrF3 which got a higher b.p?
1.Calculate the molar mass of a metal that forms an oxide having the empirical formula M2O3 and contains 68.04% of the metal by mass. Identify the metal. 2) Hemoglobin is the oxygen carrying compound found in human blood. It is found to contain 0.3335% ir
Chapter 17: More Aqueous Equilibria-Part 2.
Solubility of Slightly Soluble Salts Factors that Affect Solubility Separation of Ions and Precipitation
IV. Solubility Equilibria for slightly soluble salts.
A. When a slightly soluble substance is stirred in
Name: . Student
Please Print Clearly
/' . '
CHM 140V >5 l?» A: .
Mid-Term Test, 1 Hour
October 25, 2004
Answer all 4 questions. Please write in pen. The only aids allowed are non-programmable
1. a. Fill in the symbols for the rst 36 element
.. . . - _ Student Numberguwh
' PLEASEVPRINT CLEARLY '
'October 27, 2003 - 1 Hour
. AnSWer all questions, 25 marks per'question.
The only aids allowedare non-prografrun'able calcutators.
l. I a. - Onlthe Periodic Table below, fill-i
We can assign oxidation states to the carbons in various environments by noting that C is more electronegative than H while it is less electronegative than most other atoms including O, N, or halides (F, Cl, Br, I). The following rules allow us to assign
Chemistry CHM140 Prep -Know your formulas and the first 36 elements of the periodic table for the first term test - tests are somewhat from lecture notes and the book. teaches you how to study for university Don't skip lectures and buy old tests since the
Chapter 7: Electronic Structure of Atoms
A. Quantum Theory Electrons in atoms can have only certain discrete energies, referred to
as energy states or energy levels. Normally, the electron is in the state of lowest energy called the ground state (n=1). By