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For more information, please see full course syllabus of Chemistry
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Lecture Comments (20)

1 answer

Last reply by: Prajwal Jagadish
Fri Sep 25, 2015 9:13 PM

Post by Prajwal Jagadish on September 25, 2015

Is on amu equal to one proton and/or 1 neutron

0 answers

Post by Okwudili Ezeh on October 12, 2014

Dear Professor Goldwhite,
I need the transcript for all your lectures on this website. Could you notify the people at Educator.com about this.

1 answer

Last reply by: Zachary McCoy
Fri Jan 3, 2014 10:37 PM

Post by Lavanya Kanneganti on August 8, 2013

What is the difference between the law of definite proportions and mulitple proportions?

0 answers

Post by Yisrael Harris on May 13, 2013

I think there is an error in Extra Example 2:

You stated:

"A mile is about 5/8 of a kilometer."

I believe the reverse is true.

0 answers

Post by Yisrael Harris on May 13, 2013

I think there is an error in Extra Example 1:

Where you have 100 - x%, it should be: (100 - x)%

1 answer

Last reply by: Dr. Harold Goldwhite
Thu May 9, 2013 11:54 AM

Post by Marian Iskandar on April 14, 2013

Honestly, one of the most thorough lectures I've ever had on the subject. No stone unturned. Thank you professor! :)

0 answers

Post by Nik Googooli on August 23, 2012


1 answer

Last reply by: Malini Khan
Thu Jun 21, 2012 4:07 PM

Post by megan tsang on June 14, 2012

in 18:30 was the deuterium AMU suppose to be 0.002 AMU? not 2.000 amu???

2 answers

Last reply by: Lavanya Kanneganti
Thu Aug 8, 2013 12:33 PM

Post by saloni bhurke on February 22, 2012

Dalton was born in 1800s or 1900s?

1 answer

Last reply by: Tony Ammirati
Sat Jul 9, 2011 8:31 PM

Post by christopher aime on May 9, 2011

For additional example 1, How did you get the average (Cu63 and Cu65) to be 63.55.When I calculate it I get:

.6300x + [65.00 - .6500x ] = 64.98

What do you think I'm doing wrong?

2 answers

Last reply by: Dan A.
Sun Aug 7, 2011 10:55 AM

Post by Sherry Yacoub on December 2, 2009

what is the exact definition of law of definite proportions?????

Atomic Theory and Measurement

  • Dalton’s Atomic Theory: statements which shaped atomic theory for years; atoms cannot be cut, atoms of one element are identical, compounds are made from small numbers of atoms

  • Law of Multiple Proportions: definition

  • Current Atomic Theory: atoms have components (protons, electrons, neutrons); atoms of same element may have different masses (isotopes)

  • Nuclear charge Z is an integer and identifies an element

  • Atomic Masses are in amu, isotopes have different number of neutrons

  • Learn the basic SI units and multipliers

Atomic Theory and Measurement

Lecture Slides are screen-captured images of important points in the lecture. Students can download and print out these lecture slide images to do practice problems as well as take notes while watching the lecture.

  • Intro 0:00
  • Dalton's Atomic Theory 0:05
    • Law of Multiple Proportions
  • Current Atomic Theory 5:59
    • Components: Electrons, Protons, Neutrons
    • Isotopes
    • Complex Molecules
  • Fundamental Definition of an Element 11:27
    • Nuclear Charge (Z)
    • Atomic Number
    • Isotopes
  • Atomic Masses 15:53
    • Hydrogen, Carbon, Chlorine
  • Measurement 22:35
    • SI Units
  • Basic Units 26:39
    • Meter, Kilogram, Second, Kelvin, Liter
  • Multiplier Prefixes 33:05
  • Measure Quantity 40:50
    • Number x Unit
    • Example: Height, Volume
  • Additional Example 1
  • Additional Example 2