Chemistry- Measurements Flashcards
(26 cards)
0
Q
Unit
A
Defines how the value was measured
1
Q
Number
A
Determines the magnitude of a measurement
2
Q
Mass
A
Kilogram (kg)
3
Q
Length
A
Meter (m)
4
Q
Time
A
Second (s)
5
Q
Temperature
A
Kelvin (K) *NO NEGATIVE OR DEGREE SIGN
6
Q
Electric current
A
Ampere (A)
7
Q
Amount of substance
A
Mole (mol)
8
Q
Luminous intensity
A
Candela (cd)
9
Q
Force and weight measurement
A
Newton
10
Q
Energy measurement
A
Joule
11
Q
Frequency (of vibrations and waves) measurement
A
Hertz
12
Q
Accuracy
A
- is the measured value close to the accepted value
- depends in careful measurements & quality of the measuring device
13
Q
Precision
A
- will repeating the measurement yield the same result
- depends on skillful estimation& divisions of the measuring instrument
14
Q
Sig Figs of exact numbers
A
- Infinite
- exact numbers are obtained by COUNTING NOT MEASURING
15
Q
Leading Zeros
A
- zeroes that precede all the nonzero digits
- DO NOT COUNT AS SIG FIGS
- ex. 0.0000009
16
Q
Captive Zeroes
A
- zeroes between nonzero ones
- ALWAYS COUNT
- ex. 2098
17
Q
Trailing zeroes
A
- zeroes at the right end of the number
- COUNT ONLY IF THERE IS A DECIMAL POINT
- ex. 9.300 (4)
18
Q
1 in
A
2.54 cm
19
Q
1 mi
A
5280 ft
20
Q
1 gal
A
3.78 L
21
Q
1 lb
A
454 g
22
Q
I cal
A
4.18 J
23
Q
1 mL
A
1 cm3
24
1 m3
1000 L
25
1 dm3
1 L
