lect3_2Sept08

lect3_2Sept08 - READ CHAPTER 3 in TEXT Suggested Problems 7...

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Unformatted text preview: READ CHAPTER 3 in TEXT Suggested Problems- 7, 11, 19, 37, 39, 41, 45, 47, 49, 51, 53, 57, 59, 61, 63, 65, 67, 69, 91, 101, 105 CAPA 1 DUE FRIDAY NIGHT 5 Sept CAPA 2 Due Wednesday Night 10 Sept Density and Specific Gravity ¡ A concentrated hydrochloric acid solution is 36.31% HCl and 63.69% water by mass. The specific gravity of the solution is 1.185. What mass of pure HCl is contained in 175 mL of this solution? You do it! You do it! Density and Specific Gravity HCl g 75.3 solution g 100.00 HCl g 36.31 mL 1 n sol' g 1.185 n sol' mL 175 HCl g ? L g 1185 mL g 1.185 density 1.185 Gravity Specific = × × = = = ∴ = Different Theories of the Atom Now know atoms consist of three primary particles. electrons protons neutrons 8 Properties of the Subatomic Particles Name Charge Mass (amu) Mass (grams) Electrons (e) -1 5.49 x 10-4 9.1095 x 10-28 Protons (p) +1 1.0078 1.6725 X 10-24 Neutrons (n) 1.0087 1.6750 x 10-24 1 amu = 1.6606 x 10 –24 grams • Also that atoms have a Nucleus – a small, dense, positively charged region in the center of the atom. • This nucleus contains the protons and the neutrons. • The electrons are outside the nucleus NOTE: ATOMS ARE ELECTRICALLY NEUTRAL Therefore # of protons = # of electrons The Nuclear Atom viewed in cross section. protons and neutrons electrons Atomic Number, Z of an element = number of protons in the nucleus of an atom • Atoms of a given element may contain different numbers of neutrons • atoms of a given element which contain different numbers of neutrons are called Isotopes Atomic Number, Z of an element = number of protons in the nucleus of an atom NOTE: ATOMS ARE ELECTRICALLY NEUTRAL Therefore # of electrons = # of protons For a a given element all atoms contain the same Number of protons and electrons Three Isotopes of Hydrogen Z = Atomic Number of an element = number of protons in the nucleus of an atom (and therefore number of electrons for the neutral atom) X A Z Atomic Number, Z= number of protons in the nucleus of an atom H H H 3 1 2 1 1 1 We Identify Isotopes By Their Atomic Number and Their Mass Number Stable Stable Radioactive Mass number, A = number of protons + neutrons in nucleus of atom Periodic Table 6 C 12.011 Atomic Weight in atomic mass units Atomic Number Symbol for element Atomic Weights ¡ “ Atomic weight ” of an element is average mass of an atom of the element....
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This note was uploaded on 09/26/2008 for the course CHEM 107 taught by Professor Generalchemforeng during the Fall '07 term at Texas A&M.

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lect3_2Sept08 - READ CHAPTER 3 in TEXT Suggested Problems 7...

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