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Lecture 1

CHM2311 Lecture 1: Chapter 1-Study Notes.docx


Department
Chemistry
Course Code
CHM 2311
Professor
Natalie Goto
Lecture
1

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Chapter 1:
Physical Change-Alters physical properties not composition
Chemical Change-when substance(s) are converted to different substance
Solid-Particles lie close next to each other in 3d array
Liquid-Close together but move randomly
Gas- Particles have large distance in between them
Energy is the ability to do work
Potential Energy-energy due to position of object (higher-less stable)(lower-more)
Kinetic Energy-energy due to motion of object
Conversion
We put the given in the denominator to cancel it out , and the wanted in the numerator.
(beginning unit)( final unit/beginning unit)=final
(beginning unit x beginning unit) x final unit2/beginning unit2=final unit2
Ex: Convert 150km to m
(150km)(1000m/1km)= 150 000m
Ex: (Note: 1mL=10-3 L ) Convert 4.6mL to cm3
(4.6mL)(1cm3/1mL)= 4.6cm3
Density= mass/volume
Kalvin zero point=-273.15
Sig Figs:
Addition and Subtraction: Same number of decimal places as the one with the fewest
2.06mL-1.1mL=0.96mL=1.0mL
Multiplication and Division: Same number as total amount of sig figs for the smallest one
2.2 x 3.7845=8.3
Uncertainity:
All measurements have uncertainty, the last digit is the uncertain digit.
Ex: 100mL volumetric flask that is guaranteed to contain the specified volume within
0.1mL. How Many sig figs?
100.0 +/- 0.1mL , 4 sig figs
Rounding:
=5,5 after zeros,even numbers remain unchanged(3.45=3.4), odd numbers inc. by 1
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