Mr. Anthony Gates AP Chemistry Unit 9

Slides:

Advertisements

Similar presentations

Atomic Structure Nucleus – contains protons and neutrons

Advertisements

Chapter 11B Notes Determining Isotope Masses. Intro What is the mass of an atom with 6 protons and 6 neutrons? 12 What is the mass of an atom with 6 protons.

Average Atomic Mass.

Dalton was proved incorrect and his theory was modified

Chemical Ideas 2.1. A simple model of the atom.. What’s inside? In the nucleus? Protons And around the nucleus? Electrons Neutrons.

Mass Number Atomic Number equals the # of... NUCLEUS ELECTRONS PROTONS NEUTRONS NEGATIVE CHARGE POSITIVE CHARGE NEUTRAL CHARGE ATOM.

Isotopes Atoms of the same element that different mass numbers

Isotopes  Atoms with the same number of protons but different numbers of neutrons  Ex) Carbon 12 vs. Carbon 14  These atoms have a different mass 

 Atomic Number- the number of protons in the nucleus of an atom of that element  Ex: Hydrogen atoms have only one proton in the nucleus, so the atomic.

Subatomic Particles. Atomic Particles ParticleChargeMass (kg)Location Electron9.109 x Electron cloud Proton x Nucleus Neutron

Isotopic Abundance SCH 3U. Atomic Mass The mass of an atom (protons, neutrons, electrons) Relative Atomic Mass: An element’s atomic mass relative to the.

Atomic Structure.  Atomic number – the number of protons in the nucleus of an atom ( ID of element )  Mass number– sum of protons and neutrons in an.

Section 4.3 How atoms differ. Atomic Number Represents three things in a neutral atom: 1. What element it is 2. The number of protons in each atom 3.

Average Atomic Mass. Relative Atomic Masses  Masses of atoms (in grams) are very small, so for convenience we use relative masses.  Carbon-12 is our.

Atomic Structure The Periodic Table, Isotopes, and Average Atomic Mass.

Atoms / Elements Different number of protons Protons found in nucleus # of protons = atomic number Since atom is electrically neutral: #protons = # electrons.

Isotopes. Let’s Review ProtonsNeutronsElectrons Charge +1 0 Mass 1 amu 0 Location nucleus Electron cloud.

Isotopes. What is an isotope? Not all atoms of an element are identical. Some elements have isotopes. Isotopes (iso means “same”) are atoms with the same.

Atomic Structure and Isotopes. Recap: Atomic Structure An atom is the simplest form of an element that can take part in a chemical reaction Three subatomic.

Isotopes and abundance. The relative atomic mass scale is now based on an isotope of carbon, carbon-12, which is given the value of amu.

4.3 Atomic #, Mass #, Atomic Mass & Isotopes. Atomic Number  What are the 3 subatomic particles?  Which of the subatomic particles identifies an element?

Same Element Different Atom- Isotopes All atoms of a particular element are not exactly alike. Some elements have atoms with different masses (isotopes)

Isotopes are atoms of the same element that have a different number of neutrons For example, Hydrogen has 3 isotopes: Protium (0 neutrons) Deuterium (1.

What is an ISOTOPE? EXAM PRACTICE

SNC1D Isotopes.

Atomic Structure Current Atomic model

Average Atomic Mass In nature, most elements are a mixture of different isotopes The mass of a sample of an element is a weighted average of all the isotopes.

Calculating Average Mass

4.2 – NOTES The Mass of the Atom

Atoms / Elements •Different number of protons

Atomic Structure.

Atomic Structure.

A B 21085At Fe Mo 5827Co 3216S Pb4+ Symbol

Unit 2: Atomic Theory & Structure

Counting Atoms Section 3.3.

Unit 2: Atomic Theory & Structure

The atom and Isotopes.

Basic Atomic Structure

Subatomic Particles.

Atomic Symbols protons + neutrons = mass # atomic # = protons.

Distinguishing Between Atoms

Mass Spectrometry Main Concept:

H H H Isotopes element: same or different mass:

H H H Isotopes element: same or different mass:

Subatomic Particles.

Elements, Isotopes and More

Ch. 3 Atoms 3.3 Counting Atoms.

Mass Spectrometer.

Atomic Structure Chemistry.

Atomic Symbols protons + neutrons = mass # atomic # = protons.

Mass Spectrometry.

Counting Atoms CHAPTER 3.3.

Atomic Symbols = = mass # atomic # protons + neutrons protons

How We Know What We Can’t See Looks Like Day 4 Average Atomic Mass

Atomic Symbols protons + neutrons = mass # atomic # = protons.

Periodic table data and Isotopes

Atomic Number, Mass Number, Atomic Mass and Isotopes

Unit 1: Safety & Atomic Concepts

Structure of the Nucleus

More about Elements.

How We Know What We Can’t See Looks Like Day 4 Average Atomic Mass

A simple model of the atom.

ARE ALL ATOMS OF THE SAME ELEMENT IDENTICAL?

Subatomic Particles.

Atomic Particles Particle Charge Mass (kg) Location Electron -1

Presentation transcript:

Mr. Anthony Gates AP Chemistry Unit 9 Mass Spectroscopy Mr. Anthony Gates AP Chemistry Unit 9

Isotopes Isotopes: atoms of the same element with different masses due to varying amounts of neutrons. Isotope Protons Electrons Neutrons Nucleus Hydrogen-1 (Protium) 1 Hydrogen-2 (Deuterium) Hydrogen-3 (Tritium) 2

Composition of the Nucleus Atomic Mass Atomic mass is the average of all the naturally occurring isotopes of that element. Carbon = 12.011g/mol Isotope Symbol Composition of the Nucleus % in Nature Carbon-12 12C 6 protons 6 neutrons 98.89% Carbon-13 13C 7 neutrons 1.11% Carbon-14 14C 8 neutrons <0.01%

Mass Spectrometry

Mass Spec. cont. Data from mass spectrometry aka. mass spectroscopy demonstrate evidence that an early model of the atom (Dalton’s model) is incorrect; these data then require a modification of that model. Data from mass spectrometry also demonstrate direct evidence of different isotopes from the same element. The average atomic mass can be estimated from mass spectra.

Atomic Mass Isotope Isotopic mass (amu) Abundance (%) 6329Cu 62.9298 69.09 6529Cu 64.9278 30.91 Atomic mass is then calculated in the following way: (62.9298)(0.6909) = 43.48 (64.9278)(0.3091) = 20.07 63.55

Mass Spectrum of CO2

Mass Spectrum of Bromine Bromine has two isotopes: 50 Mass Spectrum of Bromine Bromine has two isotopes: 50.69% Bromine-79 and 49.31% Bromine-81

Methyl Bromide CH3Br

Methylene Chloride (CH2Cl2) Chlorine is 75.77% 35Cl and 24.23% 37Cl

Vinyl Chloride (CH2CHCl) Chlorine is 75.77% 35Cl and 24.23% 37Cl