{[ promptMessage ]}

Bookmark it

{[ promptMessage ]}

Chapter 2 Lecture Notes - • What’s the mass number of a...

Info iconThis preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon
chemistry is the study of matter and its transformations: occurs everywhere car rusting out: iron + O 2 to give you rust striking a match: P is being transformed to produce fire making kool-aid breathing: hemoglobin (protein) holds iron, which binds to oxygen allowing you to breath Dalton: atomic theory all matter is composed of atoms one element: same chemical properties compounds: chemical bonding//chemical reaction dissolving something: different from a compound chemical reaction=joining, separating or rearranging atomic particles proton: positive 1.6726 x 10 -24 grams: about 10x heavier than electrons neutron: negative 1.6749 x 10 -24 grams electron: neutral 9.1094 x 10 -28 grams protons + neutrons = mass → tennis ball (nucleus) elections = volume → football field (orbits) atomic number ( z ): protons define the element neutral atom vs. charged ion monatomic ions: one atom with net charge
Background image of page 1

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

View Full Document Right Arrow Icon
Background image of page 2
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: • What’s the mass number of a nitrogen atom with 8 neutrons? 15 (atomic number of 7 + 8) Write its symbol. 15 N • What’s the mass of a proton in amu’s? mass of a proton=1.67262129 x 10-24 grams 1 amu=1.66054 x 10-24 grams multiply & grams cancel out to get 1.00728 amu if you combine the proton & neutron, you get the mass of an electron • Isotopes: same # of protons, but more or less neutrons radioactivity is not necessarily a bad thing: only too much is ex. CSI: based on percent abundances, isotopes can be discovered ex. 2H (deuterium), 13C, 15N, 18O, 31P MRI, NMR • Percent Abundance → Fractional Abundance Carbon: 12 C = 98.9%---13 C = 1.10% Nitrogen: 14 N = 99.6349%---15 N = 0.3669% Oxygen: 16 O = 99.76215%---17 O = 0.0383%---18 O = 0.20012% • Atomic weight: sum of products of the fractional abundance & the isotopic masses...
View Full Document

{[ snackBarMessage ]}

Page1 / 2

Chapter 2 Lecture Notes - • What’s the mass number of a...

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document Right Arrow Icon bookmark
Ask a homework question - tutors are online