Average Atomic Mass Practice

Slides:

Advertisements

Similar presentations

4.3: HOW ATOMS DIFFER ATOMIC NUMBER

Advertisements

Average Atomic Mass & % Abundance

Average Atomic Mass. How much does an atom weigh?  Protons & Neutrons:  1.67 X gram  Electrons:  9.10 X gram  To avoid working with.

Average Atomic Mass Practice

Atomic Mass Standard mass unit is derived from carbon 12 Atomic mass unit – the mass equal to 1/12 the mass of one Carbon 12 atom.

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.  An element can exist in a number of forms, called isotopes. Isotopes are forms of the same atom that vary in mass as a result of.

Average Atomic Mass.

Average Atomic Mass Due Monday Oct 14, 2013

Atoms Atomic Mass/Number Ions/Charges of Molecules Isotopes/Perc ent Abundance

Average Atomic Mass. Masses of Atoms A scale designed for atoms gives their small atomic masses in atomic mass units (amu) An atom of 12 C was assigned.

Average Atomic Mass. Average Atomic Mass – the weighted average of the masses of the isotopes of an element Every element is composed of several naturally.

Examples: Average Atomic Mass. Example Chlorine exists as a mixture of % chlorine-35 and % chlorine-37. Determine the average atomic mass.

Isotopes and Mass Number. Atomic Number The number of protons in each atom identifies it as an atom of a particular element Each atom has a unique number.

ISOTOPES and RELATIVE ABUNDANCE What is an isotope? What is relative abundance?

Isotopes Atoms of the same element that different mass numbers

Number of Protons = Number of Electrons Number of Protons = Atomic Number Atomic Mass = Protons + Neutrons.

Average Atomic Mass The weighted average of the masses of all the naturally occurring isotopes of an element.

Unit 2 Review - Section 1 Atomic Structure and Mass.

More about isotopes Atomic mass vs average atomic mass or atomic weight.

Using Isotope Data to Find a Weighted Average.  Each isotope will have two values associated with it.  Mass of Isotope  Percent Abundance (% found.

Calculating the Average Atomic Mass. Steps for Calculating Average Atomic Mass (When given percentages of each isotope and each isotopes mass) 1. Convert.

TAKE A …. GUIDED NOTES PAGE ATOMIC MASS W.S. ….OFF MY DESK.

Atomic Mass The Atomic Mass of Candium Lab. Atomic Mass This is the weighted average mass of the atoms in nature of that element A weighted avg mass reflects.

Atomic Mass. Masses in amu Only carbon-12 has an atomic mass exactly equal to its mass # One atomic mass unit (amu) is defined as 1/12 the mass of a carbon-12.

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.

 The weighted average of its naturally occurring isotopes. Chemical Name Atomic # Chemical Symbol Atomic Mass (Average Atomic Mass)

Average atomic Mass. What does the atomic mass tell us on the Periodic table?

Chapter 3 Average Atomic Mass. Section 3 Counting Atoms Relative Atomic Masses The standard used by scientists to compare units of atomic mass is the.

Atomic Mass and Isotopes. Review Quiz ParticleChargeMassLocationSymbol Electron Proton Neutron.

Average Atomic Mass If there are 2 naturally occurring isotopes of Neon including Ne-20 and Ne-22. then the average mass of Neon atoms should be ___ amu.

Atomic Mass The Mole Atomic Weight Formula Weight Molarity of a Solution.

Average Atomic Mass.   atomic masses reported in periodic table represent: weighted average of masses of all naturally occurring isotopes of an element.

Average Atomic Mass What is average atomic mass? Average atomic mass is the weighted average of the atomic masses of the naturally occurring isotopes of.

How Atoms Differ. a. Properties of Subatomic Particles ParticleSymbolLocationRelative Charge Relative mass Actual mass (g) Electron Proton Neutron.

Isotopes and Mass Number. Isotope Atoms of the same element with: Same number of protons BUT Different number of neutrons ELEMENT IS TO ISOTOPE AS DOG.

Average Mass Activity Find the average mass of all the spheres in the tray. You may: -Make no more than 3 mass measurements. -Mass only 1 sphere at a time.

BELLWORK What is a good definition for an isotope? In other words, what are isotopes? If you write I don’t know, you will not get a stamp,

Isotopic Abundance Pages Thinking question Why are there decimal places for atomic masses on the periodic table if protons and neutrons have amu.

Atomic Number & Mass Number All atoms consist of protons and electrons- most also have neutrons Protons & neutrons- in the small dense nucleus- similar.

Average atomic mass of lithium isotopeabundanceatomic mass Li-67.49% amu Li % amu.

WEIGHTED AVERAGE MASS NUMBER: 1)The mass number on the periodic table is calculated from the weighted average of the most abundant isotopes. 2) Abundance.

Examples of Effective and Ineffective Power Point Slides.

Average Atomic Mass!!!. Copper is made of two isotopes. Copper- 63 is 69.17% abundant and it has a mass of amu. Copper-65 is 30.83% abundant and.

Concept Check 2.1 Atomic Size

Average atomic mass of isotopes Calculating the average atomic mass Element “X” Natural abundance of isotope X 10% = 4 amu 30 % = 5 amu 60 % = 6 amu.

How Atoms Differ.

Calculating Atomic Mass

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 Atomic Mass

Calculating Average Mass

5.1 – Isotopes and average atomic mass

Irregularities Of Mass In The Periodic Table

What is average atomic mass?

What is average atomic mass?

Average atomic Mass.

Estimating the Mass Number:

Isotopes 436 Objectives: 5.2 Identify the advantages and disadvantages of using isotopes in industry, medical science, basic research, and in the environment.

Tuesday, September 23, 2014 Objective: Students will calculate the average atomic mass of common isotopes of an element. Warm-Up What do the following.

Unit 2: Atomic Theory & Structure

Average Atomic Mass.

4.2 Periodic Table Squares and Average Atomic Mass

Average Atomic Mass.

How Atoms Differ Chp 4.

Section 2.4 Atomic Weights.

Average Atomic Mass If there are 2 naturally occurring isotopes of

Find the average of the following numbers…

Average Atomic Mass.

Aim: What are ions? Do now: Lithium has two isotopes. One isotope of lithium has mass of amu and its abundance is 7.42%. Another isotope of lithium.

T. Trimpe Atomic Math Challenge #2 T. Trimpe

Presentation transcript:

Average Atomic Mass Practice Silicon has 3 isotopes with the following % abundances. Si-28, 92.23% Si-29, 4.67% Si-30, 3.10% Calculate silicon’s average atomic mass.

Answer (28 x 0.9223) + (29 x 0.0467) + (30 x .031) = 28.11 amu

% Abundance Practice Silver, Ag, exists as 2 isotopes, Ag-107 and Ag-109. Calculate the % abundance for each isotope of silver.

Answer 107.8682= (x)(107) + (1-x)(109) X=0.5659 Ag-107 is 56.59% abundant Ag-109 is 43.41% abundant

2) Lithium exists as 2 isotopes, Li-6 and Li-7 2) Lithium exists as 2 isotopes, Li-6 and Li-7. Calculate the % abundance for each isotope of lithium.

Answer 6.941=(x)(6) + (1-x)(7) X= 0.059 Li-6 is 5.90% abundant Li-7 is 94.10% abundant