Lecture2, Chapter 2, Section 1-2

Announcements

1. Roll Call
2. Questions

Scientific Notation

1. Large Numbers
1. 250
2. 2.5 * 100
3. 2.5 * 10 * 10
4. 2.5 * 10²
5. Counting decimal places
6. More examples
2. Small Numbers
1. 0.025
2. 2.5/100
3. 2.5/10²
4. 2.5 * 10^-2
5. Counting decimal places
6. More examples
3. When to use it
4. How to use calculator
1. EE or EXP
2. (2.0 * 10²) * (2.0 * 10⁵) =
3. (2.0 * 10^-2) * (2.0 * 10^-5) =
4. 5 * (2 + 4) =
5. (2 + 3) * (2 + 3) =

Units

1. Significance
2. SI Prefixes.

SI prefixes (Table 5 from NIST Special Publication 811, 1995 Edition)

Factor	Prefix	Symbol		Factor	Prefix	Symbol
1024	yotta	Y		10-1	deci*	d
1021	zetta	Z		10-2	centi*	c
1018	exa	E		10-3	milli*	m
1015	peta	P		10-6	micro*	u
1012	tera	T		10-9	nano*	n
109	giga	G		10-12	pico*	p
106	mega*	M		10-15	femto	f
103	kilo*	k		10-18	atto	a
102	hecto	h		10-21	zepto	z
101	deka	da		10-24	yocto	y

3. Common Units

Property	Unit	Abbreviation	Conversion
Distance	Meter	m
	Angstrom	Å	10-10 m
Mass	Gram	g
Volume	cubic meter	m3
	liter	l	dm3
	cubic cm	cc or cm3	10-3 l
Time	second	s
Temperature	Kelvin	K	°C + 273.15
	Celsius	°C	K - 273.15
Force	Newton	N	kg m s-2
Energy	Joule	J	Nm or (kg m2 s -2)
	calorie	cal	4.184 J
	electron volt	eV	1.6021 x 10-19 J
Power	Watt	W	J s-1
Pressure	Pascal	Pa	N m-2 (kg m-1 s-2)
	torr	torr	133.3 Pa
	mm Mercury	mmHg	133.3 Pa
	Atmosphere	Atm	101325 Pa
	Bars	Bar	105 Pa
	Pounds per Square Inch	PSI	6893 Pa

4. Using Units in problem solving

Homework

1. Questions
2. Students work on board

Review Problem

Convert the distance to the beach (200 km) into meters, centimeters, inches, feet, and miles.

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Scott Van Bramer
Department of Chemistry
Widener University
Chester, PA 19013

Please send any comments, corrections, or suggestions to svanbram@science.widener.edu.

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Last Updated 10/26/02