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Flashcards in Intro to Chemistry 105-2002 Deck (19)
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1

 

The Scientific Method

2

 

Measurement

Measurement always includes a number and a unit.

Examples: 

120 lbs. 

 68 kg

3

 

Standard Notation

Examples:

7.42

1,250

0.00541

4

 

Scientific Notation

Examples:

1.095 x 105

5.86 x 10-5

* If the number has been turned into a small number, use a negative exponent. If the number has been turned into a large number, use a positive exponent. *

5

 

Avogadro's Number

6.022 x 1023

The number of atoms or molecules you need to measure the size of a human being.

6

 

What is the standard form for

1.42 x 104 ?

14,200

* Move the decimal 4 places to the RIGHT

(because of the positive exponent in 104) *

 

7

 

What is the scientific notation for 

0.00149 ?

1.49 x 10-3

* The decimal must be moved 3 places to the right. When the decimal is being moved to the right, it is a negative exponent. When moved to the left, it becomes a positive exponent. *

8

 

Conversion Chart

T     Tera     1012

G     Giga     109

M     Mega     106

K     Kilo     103

h     Hecto     102

da     Deka     101

————————————— BASE UNIT (g, m, L, sec, etc.)

d     Deci     10-1

c     Centi     10-2

m     Milli      10-3

µ    Micro     10-6

n     Nano     10-9

p     Pico     10-12

f     Femto     10-15

9

 

Express 15,000,000,000m using metric prefixes.

15,000,000,000m =

15 x 109m

  • Take 109
  • In the conversion chart, 109 is in giga (G)

15 x 109m = 15 Gm

 

10

 

Express 0.00000042g using

metric prefixes

0.00000042g =

4.2 x 10-7

  • Take 10-7
  • We see that we do not have 10-7 in our conversion chart, so go down to 10-6 instead, which is in Micro units (µ). 

0.42 x 10-6 = 0.42µg

 

11

 

Unit Conversions

Mulitply the given unit by a conversion factor. 

 

12

 

Convert 9.5 cups into quarts

– GIVEN:   9.5 cups

– REQUESTING:    Cups to quarts

– CONVERSION FACTOR:   There are 4 cups in 1 quart

– ANSWER:     2.38 qt

 

13

 

Convert 4,250 cm to meters

– GIVEN:   4,250 cm

– REQUESTING:    cm to meters

– CONVERSION FACTOR:   There are 10-2m in 1 cm

– ANSWER:    42.5 m

14

 

How many cm are in 4.6 inches?

– GIVEN:   4.6 inches

– REQUESTING:    How many cm in 4.6 inches

– CONVERSION FACTOR:   There are 2.54 cm in 1 inch

– ANSWER:     11.7 cm

15

 

How many grams are in 160 lbs.

if 1 kg = 2.205 lbs. and a kilo = 103g?

There are two different conversion here. 

ANSWER: 72,562g

16

 

Convert 235kg to lbs.

ANSWER: 518 lbs

17

 

Convert 4585mL to qts. when 

1.057 qt = 1L

ANSWER: 4.846 qts

18

 

How many seconds are in 2.0 years?

ANSWER: 63,072,000 seconds in 2 years

19

 

Convert 6.23 x 106cm to km

ANSWER: 62.3 km