CHM 1311 Lecture Notes - Lecture 2: Antoine Lavoisier, Working Mass, Picometre

• School: University of Ottawa
• Department: Chemistry
• Course: CHM 1311
• Professor: Wendy Pell

Document Summary

Chm1311 d professor wendy pell: intro and review pt. Law of conservation of mass (antoine lavoisier): matter is neither created nor destroyed: mass before reaction = mass after reaction. Carbon monoxide: 57. 1% oxygen and 42. 9% carbon. Carbon dioxide: 72. 7 oxygen and 27. 3% carbon. I. e 1:1 as in ab, or 1:2 as in ab2: chemical reactions result in separation, combination, or rearrangement of atoms, but do not result in creation or destruction of atoms. Dalton atoms are small and indivisible; thomson atoms contain negatively charged electrons; rutherford atoms contain a positively charged nucleus. Scale: heaviest atom has a mass of 4. 8 x 10-22g and a diameter of 5 x 10-10m. 1 amu (atomic mass unit) = 1. 66054 x 10-24g. 1 pm (picometer) = 1 x 10-12m. 1 (angstrom) = 1 x 10-10m = 100 pm = 1 x 10-8cm. 240 amu and 2 ; typical c-c bond length 154 pm (1. 54 ) A is mass number = # protons +# neutrons.