University of the Philippines, Manila
College of Arts and Sciences
Department of Physical Sciences and Mathematics
MATHEMATICS 17: College Algebra and Trigonometry
First Departmental Exam
July 12, 2013
I. Write TRUE if the given statement is always accura
What is a rock?
a naturally-occurring aggregate of one or
more minerals; may or may not contain
natural glass and organic matter.
classified by mineral and chemical
composition; the texture of the
constituent particles; and also by the
NATURAL SCIENCE 4
(THE EARTH: OUR HABITAT)
The use of geologic information to help solve
Includes the study of:
SEDIMENTARY PROCESSES AND ITS
Sediment: an accumulation of loose mineral
grains or very small fragments of rocks, such
as boulders, pebbles, sand, silt, or mud, that
are not cemented together.
Sedimentary rocks: rock that form
1.Cyclohexane, C6H12, has a vapor pressure of 97.5 mmHg at 25C. A solution was prepared by
dissolving 5 g of urea, CO(NH2)2, in 200 mL of cyclohexane (density = 0.779 g/mL) at
a) What is the molality of the solution?
Given the below initial rate data
A. Determine the order of the reaction with respect to each of the reactants.
B. What is the over-all order of the reaction?
C. Calculate the rate constant or the reaction.
D. what is the rate law for the reactio
The rate of a chemical reaction measures the amount of
System any part of the universe that is isolated from the rest by a boundary
Surrounding everything outside the system
Types of systems:
1. Open system - has boundary that allows exchange of matter and energ
Problem Set 2 (Due on Feb. 7)
GENERAL DIRECTIONS: Show all necessary computations. Write your solutions and answers on yellow
I. Nuclear Chemistry
1. Fill in the missing symbols in the following nuclear reactions:
(a) 2311Na + _ 2312Mg
An unstable nuclei, spontaneously
disintegrates by emitting radiation.
Types of Radiations
Alpha particles are dense,
positively charged particles that
are identical to a helium nuclei
MODELS OF CHEMICAL
Atomic Properties and Chemical
Bonding LOWERS the potential energy between
positive and negative particles
Type and Strength of Chemical Bonds determine the
properties of a substance
Three Types of Chemical Bonding
Ideal Gas Problems
7. Ammonium sulfate, an important fertilizer, can
be prepared by the reaction of ammonia with
2 NH3(g) + H2SO4(aq)
Calculate the volume of NH3(g) needed at 42oC
and 15.6 atm to react with 87 kg of H2SO4.
Problem Set 2
1. Complete and balance the following nuclear equations by supplying the missing particle:
a. ? 18776Os + 0-1e
+ 21H 10n + ?
+ 10n 13554Xe + 2 10n + ?
2. Write the balanced equations for (a) 188O(n, )199F (b) 1
PROBLEM SET (4TH DEPARTMENTAL EXAM)
1. Calculate the standard enthalpy of formation of gaseous diborane (B2H6) using the
following thermochemical information:
4B(s) + 3O2(g) 2B2O(s)
Ho = -2509.1 kJ
Ho = -571.7 kJ
2H2(g) + O2(g)
B2H6(g) + 3
Chem 14 TFD1
Problem Set 1
DIRECTION: Provide the complete solutions/answers for the following problems on short
bond papers. Write in blue or black ink. Deadline is on Tuesday, 13 December 2011,
1. Copy the following table on your answer sheet
CHEM 14 PROBLEM SET 3
1. How many millimoles of reagent are contained in each of the following?
a. 1.50 mL of pure H20
b. 25.0 mL of 0.644 ppm Cu2+
c. 10.0 g of 3.00%(w/w) H2O2
d. 2500 mg of 6.97% (w/w) Na2SO3
2. A mixture contains 76.5% NaCl, 6.5% MgCl2,
MOLECULAR ORBITAL THEORY
Molecular Orbital Theory (MO Theory) describes electrons in molecules through wave functions
called molecular orbitals. If you have atomic orbitals for each atom, then you have molecular
orbitals for each molecule. Like atomic orb
Theories of Acids and Bases
I. The Arrhenius Concept
1. Acids are compounds that produces H+ (aq) ions in water solution.
HCl(g) + H2O H3O+(aq) + Cl-(aq)
N2O5(s) + H2O 2H+(aq) + 2NO3-(aq)
2. Bases are compounds that produces OH- (aq) ions in water solutio
The Dissociation of Water
Pure water is a poor conductor of electricity because it
does not ionize to any great extent.
H+(aq) + OH-(aq)
The concentration of water is essentially unchanged during chemical
reactions involving d
Static vs. Dynamic Equilibrum
rate of molecules leaving the liquid phase is equal
to the rate of molecules entering the gas phase
rate of ions leaving the crystal is equal t
Area of chemistry concerned with rates of
How rapidly food spoils
Rate of fuel burning in automobiles
How quickly medicines work
Development of catalysts
change in the concen
Ways of Expressing Concentration
Percentage, %, is defined as the number of parts solute per
100 parts of solution.
-Percentage by weight, %(w/w), mass of solute (in g) per
100 g of solution.
mass solute ( g )
%( w / w ) =
mass solution ( g )