# Chem chap 2

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1. 10^1
1*10=10
2. 10^2
1*10*10=100
3. 10^3
1*10*10*10=1000
4. 10^4
1*10*10*10*10=10000
5. 10^0
1
6. 10^x * 10^y=
10^x+y
7. 10^x/10^y
10^x-y
8. what is scientific notation
standard way of expressing large as well as small number

• (large) greater than 1
• (small) less than 1
9. What is measurement?
quantative observation - value number with a unit ex] length 225cm
10. (Standard notation) - exponential notation
• decimal - between 1 & 10
• exponential part (10^x)
11. Rules of expressing a number in scientific notation
• - Move the decimal to get a number between 1&10
• -When decimal is moved to left, the power is positive
• - when decimal is moved to right, the power is negative
12. expressing using scientific notation
100.50
0.0380
5
100.
100
• 1.0050 * 10^2
• 3.80 * 10^-2
• 5 *10^0
• 1.00 * 10^2
• 1 * 10^2
13. Significant figures
• (digits) (sf) reflects precision of a given number
• greater the number of sf, greater is its precision
14. 100
100.
100.0
100.00
• 1sf
• 3sf
• 4sf
• 5sf (highest precision)
15. Rules of counting (sf) of a given number
• -all non zero digits are significant
• -leading zeros(zeros before a nonzero digit) are not significant ex] 0.000058 (2sf)
• - interior zeros (zeros after a nonzero digit) are significant ex] 100,005.78 (8sf)
• - trailing zeros (zeros after a nonzero digit) are significant, provided the number given with a decimal point
16. 100
100.
100.00
0.00100500
100.500
• 1sf
• 3sf
• 5sf
• 6sf
• 4sf
• 6sf
17. Exact number
• number with unlimited sf.
• numbers reported by counting discrete objects
• ex] 30.0000 students 30 students -unlimited sf
• numbers of a defined quantities
• ex] 1m=100cm 1.000000m=100.0000 cm
18. Rounding off number
• if digit is 4 or less, it is rounded down
• if digit is 5 or more, it is rounded up
• proceeding digit is increased by one
19. Rules of sf in calculations
The answer should be least precise as possible
20. Multiplication and Division
The answer should be least sf as possible
21. Rules of sf for addition and subtraction
The answer of least decimal places as possible
22. Measurement-Quantitative observation
Contains a number value and a unit
23. Units-
• standard agreed upon quantities by which measurements are made
• (english unit)
• (metric unit)
• (scientist use SI unit) follows metric system of units
24. Prefix Multipliers-
• Tera     T       10^12
• Giga     G       10^9
• Mega    M       10^6
• Kilo      K       10^3
• deci      d       10^-1
• centi     c       10^-2
• milli      m      10^-3
• micro    (mu)  10^-6
• nano     n       10^-9
• pico      p       10^-12
25. SI units (standard) of measurement
• Length-meter m
• volume -cubicmeter m^3
• mass - kilogram   kg
• temperature   kelvin  K
• time   seconds   s
26. length is:
• measurement of distance between two points
• measured using a ruler
27. Length:
SI unit
Metric unit
English unit
• m
• km, m, mm, nm
• in, ft, yd, mile
28. Volume is:
• a measureof 3dimensional space occupied by an object
• -is a derived measurements with units of length (raised to the power of 3)
• -is measured using graduated cylinder
29. Volume:
SI unit
Metric unit
Eng unit
Common unit
laboratories
• m^3
• km^3, m^3, mm^3
• teaspoon, tablespoon, fl oz, cups, pints, gallon
• kL, L, cL, mL, (mu)L
• 1mL=10^-3L

1cm^3=1mL=1cc
30. volume=
• L*w*h
• 1cm*1cm*1cm
• v=1cm^3
31. Mass is
• a measure  of quantity of material (matter)
• is measured using a balance
32. weight is
a measure of force of gravity acting up an object
33. Mass:
SI unit
metric unit
eng unit
• kg
• kg, mg, g, mu g
• oz., lb  16 oz.----- 1lb.
34. Unit conversion
• changing from one unit to another for particular measurement
• using conversion factors derived from equivalents
35. Density is:
a measure of mass per unit volume is the ratio of mass to volume

d=m/v
36. How to find V=
V= mass/ density
37. How to find mass=
M=d*v
 Author: babyg7207 ID: 238040 Card Set: Chem chap 2 Updated: 2013-10-01 05:23:01 Tags: chem chap Folders: Description: Chap 2 Chem Show Answers: