{[ promptMessage ]}

Bookmark it

{[ promptMessage ]}

# Ch 3 Packet - CHAPTER 3 MEASUREMENT AND CHEMICAL...

This preview shows pages 1–4. Sign up to view the full content.

Chemistry 139 Fall 2009 page 1 CHAPTER 3: MEASUREMENT AND CHEMICAL CALCULATION HW Problems: 1, 3, 9, 11, 13, 15, 35, 37, 41, 43, 45, 47, 51, 57, 59, 67, 71, 102 METRIC UNITS measurement : a number with attached units unit: an expression of the size and type of number SI Units (from French "le S ystème I nternational d’Unités") standard units for measurement Metric system : A unified decimal system of measurement with a basic unit for each type of measurement Fundamental Units for Chemistry Derived Units for Chemistry quantity basic unit Symbol varies speed length / time m/s density mass / volume g/ml concentration number/volume mass/volume solution mass solute/mass solvent ppm mol/L mol/kg solvent volume/area length 3 / length 2 m 3 , m 2 Quantity basic unit symbol length Meter m mass Gram g volume Liter L time Second s pressure Pascal Pa

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
Chemistry 139 Fall 2009 page 2 Mass, Temperature, Volume, Density 1. Mass and weight are different Mass: a measure of the amount of matter an object possesses measured with a balance and NOT AFFECTED by gravity usually reported in grams or kilograms Weight: a measure of the force of gravity acting on a given mass usually reported in pounds (abbreviated lbs) Mass = “amount of stuff” Weight = “force given to that stuff by gravity” WEIGHT = MASS Acceleration due to gravity Mass is not affected by gravity! 2. Temperature is measured on the Kelvin or Celsius scales A. Kinetic Molecular Theory: Moving particles cause temperature - Temperature is the average kinetic energy of all the particles in a system - Molecules can rotate, vibrate, and translate (spin, shake, and move) The instrument for measuring temperature is a thermometer . B. The Kelvin Temperature Scale has the best ZERO There is a third scale for measuring temperature: the Kelvin scale The unit for temperature in the Kelvin scale is Kelvin ( K, NOT ° K ). Absolute zero indicate the theoretical lowest temperature. On the Celsius scale, absolute zero is 273.15°C. The Kelvin scale assigns a value of zero Kelvins (0 K) to absolute zero.
Fall 2009 page 3 C. Kelvin and Celsius degrees are the same size, and are “larger” than Fahrenheit degrees There are 180 Fahrenheit degrees for every 100 Kelvin or Celsius degrees: 180/100 = 1.8 = 9/5 Kelven/Celsius degrees are almost twice as big as Fahrenheit degrees D. We often need to convert between Fahrenheit and Celsius scales: 32 + 1.8) C ( = F 1.8 32) - F ( = C K = ˚C + 273.15 C = K 273.15 Ex. 1 In the movie Terminator 2 , a tanker crashes and pours out liquid nitrogen. This freezes the T- 1000 because liquid nitrogen has a temperature of 77 K. What is the equivalent temperature in ˚C and in ˚F? For every 9 degrees

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

### Page1 / 20

Ch 3 Packet - CHAPTER 3 MEASUREMENT AND CHEMICAL...

This preview shows document pages 1 - 4. Sign up to view the full document.

View Full Document
Ask a homework question - tutors are online