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

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

View Full Document Right Arrow Icon
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
Background image of page 1

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

View Full DocumentRight Arrow Icon
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.
Background image of page 2
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
Background image of page 3

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

View Full DocumentRight Arrow Icon
Image of page 4
This is the end of the preview. Sign up to access the rest of the document.

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 Right Arrow Icon
Ask a homework question - tutors are online