CHEM 112 Lecture Notes - Kilowatt Hour, Calorie, Sodium Chloride

129 views34 pages
11 Feb 2014
School
Department
Course
Professor

For unlimited access to Class Notes, a Class+ subscription is required.

Chem 112 01/07/2014
Chem lab questions  firstyear.chem@usask.ca
LABS START WEEK OF JANUARY 20TH
Join new course on mastering chem  chem112y2014section02 (MOZILLA FIREFOX)
MIDTERM  Saturday, March 1 st 10am-12pm
Chem help center Monday – Thursday @ 11:30am-1:30pm (Begins week of January 20 th)
Monday and Wednesday 11:30am with Dr. Jens Mueller
Tuesday 11:30 and Wednesday 12:30 with Dr. Alexandra Bartole Scott
Chapter 1: Matter, measurement & problem solving
1) The scientific approach (p. 1-4)
Hypothesis, scientific law & theory
2) Classification of matter (p.4-5)
Matter  solid, liquid & gas
Solids: can be either crystalline or amorphous (eg: diamond and charcoal)
Liquids: molecules are closely packed but have some ability to move around
Gases: atoms have complete freedom from each other
Unlock document

This preview shows pages 1-3 of the document.
Unlock all 34 pages and 3 million more documents.

Already have an account? Log in
1/8/2013
(p. 7)
Pure Substance: made of individual atoms or molecules  can be pure element or a pure compound
Mixture: two or more types of atoms or molecules combined in variable proportions  can be homogeneous
(mixture that has uniform composition throughout) or heterogeneous (mixture that does not have uniform
composition throughout)
Homogeneous eg: nitrogen & oxygen (can be mixed and will still be homogeneous)
Heterogeneous eg: Wet sand
Properties and Changes of Matter (p. 8-10)
Composition: parts or components of a sample of matter and their relative proportions
Physical property: characteristics a substance displays without changing its composition (eg  volatility
[boiling point])
Chemical property: characteristics a substance displays only when changing its composition (eg 
flammability)
Physical change: physical properties of sample change but composition remains unchanged
Chemical change: matter is converted to a new kind, with a different composition
3) Energy  changes in matter, both physical and chemical, result in either the gain or loss of energy
Energy: capacity to do work
Work: actions of a force applied across a distance
Electrostatic force: push or pull on objects that have an electrical charge
Unlock document

This preview shows pages 1-3 of the document.
Unlock all 34 pages and 3 million more documents.

Already have an account? Log in
Kinetic energy: energy of motion
Potential energy: energy that is stored in matter Can be introverted
Spontaneous processes high potential energy = less stable state
4) Temperature  measure of average amount of kinetic energy (higher temperature = greater average
kinetic energy)
Absolute zero: 0 K & -273 C
K = C + 273.15
5) SI prefix multipliers
Nanotechnology  length scales 1,000,000,000 times small than a meter
Velocity = length/time (meters/seconds)
Volume = length x length x length (m^3)
Density = mass/volume (kg/m^3)
% composition = mass of component/total mass x 100% (%)
example: Calculating density (p.22)
a man receives a ring from his fiancé. The ring has a mass of 3.15g, and displaces 0.233 cm^3 of water. Is
the ring made of platinum?
Density = 3.15g = 13.5g/cm^3
0.233cm^3
Unlock document

This preview shows pages 1-3 of the document.
Unlock all 34 pages and 3 million more documents.

Already have an account? Log in

Get access

Grade+
$10 USD/m
Billed $120 USD annually
Homework Help
Class Notes
Textbook Notes
40 Verified Answers
Study Guides
1 Booster Class
Class+
$8 USD/m
Billed $96 USD annually
Homework Help
Class Notes
Textbook Notes
30 Verified Answers
Study Guides
1 Booster Class