READING MEASUREMENTS TEMPERATURE CONVERSIONS ESTIMATING METRIC CONVERSIONS ID: 649492
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Slide1
MEASUREMENT
CHOOSING THE CORRECT TOOL CALCULATED UNITS
READING MEASUREMENTS TEMPERATURE CONVERSIONS
ESTIMATING METRIC CONVERSIONSSlide2
Physical quantities consist of both a number and a unit.Slide3
SI
measurement
Le
Système
international
d'unités The only countries that have not officially adopted SI are Liberia (in western Africa) and Myanmar (a.k.a. Burma, in SE Asia), but now these are reportedly using metric regularlyMetrication is a process that does not happen all at once, but is rather a process that happens over time. Among countries with non-metric usage, the U.S. is the only country significantly holding out. The U.S. officially adopted SI in 1866.
Information from U.S. Metric AssociationSlide4Slide5Slide6
Length: Centimeters and Millimeters
centimeters
millimetersSlide7Slide8Slide9
vOLUME: MILLILITERS and CUBIC CENITMETERSSlide10Slide11
Measurement
and Significant Figures
Every experimental measurement has a degree of uncertainty.
The volume, V, at right is certain in the 10’s place, 10mL<V<20mL
The 1’s digit is also certain, 17mL<V<18mL
A best guess is needed for the tenths place.Slide12Slide13Slide14Slide15Slide16
VOLUME =L x W X HSlide17
Volume Displacement
A solid displaces a matching volume of water when the solid is placed in water.
33
mL
25
mL
Slide18
MASS
– GRAMS & KILOGRAMS Slide19Slide20
The Top Loading Balance
These balances are used when an accuracy of +/- 0.1 g is sufficient.
Before weighing check that the balance is displaying grams.
Zero or Tare the balance by pressing on the Zero button.Slide21Slide22
TEMPERATURE
-
Fahrenheit
, Celsius, and Kelvin temperature scalesSlide23Slide24Slide25
Calculations Using Temperature
Generally require temp’s in
kelvins
T (K) = t (˚C) +
273
Body temp = 37 ˚C + 273 = 310 K
Liquid nitrogen = -196 ˚C + 273 = 77 KSlide26
Why is this
stuff important?Slide27
DENSITY
-
an important and useful physical property
Mercury
13.6 g/cm
3
21.5 g/cm
3
Aluminum
2.7 g/cm
3
PlatinumSlide28
Problem
A
piece of copper has a mass of 57.54 g. It is 9.36 cm long, 7.23 cm wide, and 0.95 mm thick. Calculate density (g/cm
3
).Slide29
PROBLEM: Mercury (Hg) has a density of 13.6 g/cm
3
. What is the mass of 95
mL
of Hg in grams? Slide30
Learning Check
Osmium is a very dense metal. What is its
density in g/cm
3
if 50.00 g of the metal occupies a volume of 2.22cm3? 1) 2.25 g/cm3 2) 22.5 g/cm3 3) 111 g/cm3Slide31
Learning Check
What is the density (g/cm
3
) of 48 g of a metal if the metal raises the level of water in a graduated cylinder from 25 mL to 33 mL? 1) 0.2 g/ cm3 2) 6 g/m3 3) 252 g/cm3
33 mL
25 mLSlide32
Learning Check
Which diagram represents the liquid layers in the cylinder?
(K)
Karo
syrup (1.4 g/mL), (V) vegetable oil (0.91 g/mL,) (W) water (1.0 g/mL)1) 2) 3)
K
K
W
W
W
V
V
V
KSlide33
Learning Check
If blood has a density of 1.05 g/
mL
, how many liters of blood are donated if 575 g of blood are given?
1) 0.548 L
2) 1.25 L
3) 1.83 LSlide34
Learning Check
A
group of students collected 125 empty aluminum cans to take to the recycling center. If 21 cans make 1.0 pound of aluminum, how many liters of aluminum (D=2.70 g/cm
3
) are obtained from the cans?
1) 1.0 L 2) 2.0 L 3) 4.0 L