Counting Atoms - Belle Vernon Area School District

Counting Atoms - Belle Vernon Area School District

Counting Atoms 3.3 Counting Atoms Very difficult to count Atomic Number # of p+ of each atom of that element Whole numbers Elements arranged by atomic #

Identifies the element Isotopes Isotope an atom of the same element with different # of neutrons Elements are mix of isotopes Hydrogen has 3 Mass Number total # of protons and neutrons that make up the

nucleus of an isotope Designating Isotopes

Hyphen notation = Hydrogen 3 238 Nuclear symbol- 92 U 92 is atomic # (# of protons) # of n0 = mass # - atomic # How many p+,n0,e- r in Cl-37, Br-80? Whats the notation for an isotope with 15 e- and 15 n0?

Relative Atomic Mass Atomic Mass Standard is C-12 Atomic Mass Unit (amu) exactly 1/12 the mass of a carbon-12 atom Masses are relative to C-12 atoms. All masses are averages of amus b/c of isotopes

Average Atomic Mass AAM the weighted average of the atomic masses of the naturally occurring isotopes of an element The mass of Cu-63 is 62.94 amu and the mass of Cu-65 is 64.93 amu. The abundance of Cu-63 is 69.17% and Cu-65 is 30.83%. Calculate the relative atomic mass of

copper. R.A.M. Problem Chlorine exists as Cl-35 which has a mass of 34.969 amu and makes up 75.8 % of Cl atoms. The rest of naturally occurring chlorine is Cl-37 with a mass of 36.996 amu. What is the average mass of

chlorine? R.A.M. Problem Uranium-234 makes up 0.005% of uranium atoms and has a mass of 234.041 amu. Uranium-235 makes up 0.720% and has a mass of 235.044 amu. Uranium-238 has a mass of 238.051 amu and makes up

99.275 %. What is the average atomic mass of Uranium? R.A.M. Problem Carbon-12 makes up 98.90% of existing carbon. Carbon-13, with a mass of 13.003 amu, makes up 1.10%. Traces of carbon-14 also exist. What is

the average atomic mass of carbon? Relating Mass # to Atoms Mole Amount of a substance that contains as many particles as there are atoms in exactly 12 g of C-12. Way of counting (like 1 dozen = 12) Avogadros number the # of

particles in 1 mole = 6.022 x 1023 Molar Mass Molar Mass mass of 1 mole of a substance Expressed as g/mol For an element its = to atomic mass Whats the molar mass of 1 mole

of Li, Hg, C, He, and Cl Conversions with Molar Mass Convert 2 mole of He to grams of He 3.5 mole of Cu to grams of Cu 100 grams of C to mole of C 250 grams of Br to mole of Br

Conversions with Avogadros # How many moles are in 3.01 x 1022 atoms of Ag? How many moles are in 4.97 x 1020 atoms of Cu? How many atoms are in 15 moles of C? How many atoms are in 4 moles of S

Practice Complete the section review on page 87 and do numbers 2-7.

Recently Viewed Presentations

  • Public Forum on the Pennsylvania Managed Long Term Services ...

    Public Forum on the Pennsylvania Managed Long Term Services ...

    Objective of Today's Forum. Share information about the Commonwealth's current thinking on Managed Long-Term Services and Supports (MLTSS) with the public. Gather thoughts and ideas from participants, providers, managed care organizations, and other long-term services and supports (LTSS) stakeholders
  • National Forum on Education Statistics

    National Forum on Education Statistics

    National Education Statistics Agenda Committee … addresses issues, concerns, and solutions affecting the collection . and reporting of elementary, secondary, early childhood, and . postsecondary education statistics. Policies, Programs and Implementation … addresses the policy implications of the Forum's work...
  • Introduction to TPMS Transit

    Introduction to TPMS Transit

    TPMS transit is an online tool for submitting and tracking information regarding transit investments. FA STIP. Entry, review and approval of transit program elements
  • State, Society and the Quest for Salvation

    State, Society and the Quest for Salvation

    Buddhist Doctrine: The Dharma. Appeal of Buddhism. Ashoka's Support. Four Noble Truths-all life involves suffering, desire is the cause of suffering, elimination of desire is the elimination of suffering. Noble Eightfold Path-lead balanced moderate lives, rejecting devotion to luxury. Moderate...
  • Advanced Peer Ananlysis System - CCSSE

    Advanced Peer Ananlysis System - CCSSE

    Define Comparison Group From Master Variables List: Select only Exercise Sci doctorates, 2002-03 Go to the query form; Specify all schools with >0 degrees 28 schools in comparison group Accept and Continue Add by Variable (from the Master Variables List)...
  • Mercury's Mysterious Polar Deposits

    Mercury's Mysterious Polar Deposits

    South polar region, imaged by Mariner 10 on second flyby. Frame 166902 Mercury's Mysterious Polar Deposits Sarah Mattson PTYS 395A 2/6/2008 Introduction RADAR-bright deposits were discovered at Mercury's polar regions in early 1990's Thought to be volatile ice in permanently...
  • World Literature 102A Ms. Fitz

    World Literature 102A Ms. Fitz

    ALIENATE (v) to turn away, to make indifferent or hostile; to transfer, convey. SYNONYMS: separate, drive apart, estrange. ANTONYMS: befriend, attract, captivate ...
  • Energy Systems - Weebly

    Energy Systems - Weebly

    Energy Systems. There are 3 energy systems: The aerobic system. This is the primary energy system for endurance events. It produces lots of ATP and no fatiguing by-products but it cannot produce energy quickly.