Atomic vs molecular element

    • [PDF File]Empirical and Molecular Formulas

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      Molecular Formulas •When the subscripts in a chemical formula represent the simplest ratio of the kinds of atoms in the compound, the formula is called an empirical formula. –Most ionic compounds are described with empirical formulas. •A molecular formula describes the actual numbers of atoms of each element in a molecule.


    • [PDF File]CHEMISTRY Module 1 Fundamentals of Chemistry - Energy

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      b. Atomic weight e. Gram atomic weight c. Molecular weight f. Gram molecular weight 1.2 LIST the components of an atom, their relative sizes, and charges. 1.3 STATE the criterion used to classify an atom chemically. 1.4 DEFINE the following subdivisions of the periodic table: a. Periods of the periodic table b. Groups of the periodic table


    • [PDF File]General Chemistry, in broad strokes…. I. Introduction to chemistry ...

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      Molecular Bonding (Chapter 8) Ionic vs. polar covalent vs. "pure" covalent bonding - how are they different? - be able to predict what kind of bonding will occur between atoms based on electronegativity differences - be able to estimate relative electronegativities from position of elements on the periodic table - understand the general relationship between bond order and bond length (and ...


    • [PDF File]SYMBOLS, FORMULAS AND MOLAR MASSES OBJECTIVES INTRODUCTION

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      element can be found on the periodic table. For example, one atom of magnesium weighs 24.31 amu (atomic mass units). However, one mole of magnesium weighs 24.31 g. (Moles were planned that way!) Since one mole of MgCl 2 consists of one mole of magnesium and two moles of chlorine, the mass of one mole of MgCl 2 must be the sum of the masses of ...


    • [PDF File]Atoms vs. Elements element - Weebly

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      Atoms vs. Elements An element is a primary substance that cannot be further simplified, and consists of smaller particles called atoms. An atom is the smallest amount of an element. It is composed of sub-atomic particles- neutrons, protons, and electrons. ... Molecular hydrogen (H 2), molecular oxygen (O 2) and molecular nitrogen (N 2


    • [PDF File]Flame atomic absorption spectroscopy eng - DEAC

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      We measure the intensity of molecular bands or atomic or ionic lines emitted by excited molecules, excited atoms or even by excited ions. b) Flame atomic absorption spectroscopy (FAAS): We let through the fire a light beam with such a wavelenght that can be absorbed by ground state atoms and thus we measure the decrease of light intensity.


    • [PDF File]The Chemical Composition of Wood - Forest Products Laboratory

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      are linear with respect to molecular size and, therefore, a molecule is counted equally as one molecule regardless of its size. The ratio of ~W to ~n is a measure of the molecular weight distribution. This ratio is nearly one for native cellulose in secondary cell walls of plants (6). Therefore, this cellulose is monodisperse and contains mol-


    • [PDF File]Milliequivalents, Millimoles, and Milliosmoles

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      Terminology • Mole= Avogadro’s number (6.023 x 1023) of molecules) of molecules • Molecular Weight (MW)= weight in grams of one mole of compound • Millimoles (mmole)= 1000 x moles-g/mole = mg/mmole• Valence= amount of charge of an ion • Equivalents (Eq)= number of univalent counter ions needed to react with each molecule of substance-HCl has 1 equivalent per mole in that one mole of H+


    • [PDF File]Chapter 2: The Chemical Context of Life

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      Isotopes are different atomic formations of the same element, having more neutrons than other atoms of the same element and therefore having greater mass. In nature, an element occurs as a mixture of its isotopes. For example, carbon (atomic number 6) has three isotopes. Carbon-12, 12C, accounts for about 99% of carbon in nature. This isotope ...


    • [PDF File]Atomic Spectroscopy - Truman State University

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      – In an atomic spectroscopy exper iment, the atom is the source and the detector is the observer – Since the motion of atoms is typically random, the result is symmetrical broadening of the atomic line. – Major source of broadening in atomic spectroscopy 3. Collision (Pressure) Broadening – Collisions cause changes in ground state ...


    • [PDF File]Chem 121 Handout on Atoms, Molecules, Ionic Compounds, Elements vs ...

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      For a molecular substance, the formula is also called a molecular formula, giving the actual number of atoms of each element in each molecule. Its subscripts when reduced to the lowest ratio is its empirical formula. The molecular formula is therefore some multiple of its empirical formula. e.g. Butane gas has the molecular formula C 4 H 10.


    • [PDF File]A Table of Polyatomic Interferences in ICP-MS - PerkinElmer

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      by atomic or molecular ions that have the same mass-to-charge as analytes of interest. Current ICP-MS instrumental software corrects for all known atomic “isobaric” inter-ferences, or those caused by over-lapping isotopes of different elements, but does not correct for most polyatomic interferences. Such interferences are caused by


    • [PDF File]Chapter 8 Atomic Absorption Spectrophotometry

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      Ionic spectra versus atomic spectra • Spectra of excited atoms differ from those of excited ions of the same atoms • Spectrum of singly ionized atom is similar to the atomic spectrum of the element having an atomic number of one less e.g.: –spectrum of Mg + is similar to that of Na atom –spectrum of Al+ is similar to that of Mg atom • Ionic spectra contain more lines than atomic


    • [PDF File]LECTURE 6 : BASICS FOR MOLECULAR SIMULATIONS - Historical perspective ...

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      Its differential volume element is : is It is a 6N dimensional space. For an N particle system, the volume of the total phase space is : ... provides a detailed molecular/atomic-level information Results of the “ computational experiment ” may lead to the discover new physics/mechanisms! Limitations…we’ll see later on ...


    • [PDF File]Quantum Numbers and Atomic Orbitals - Angelo State University

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      4. Spin Quantum Number (ms): m s = +½ or -½. Specifies the orientation of the spin axis of an electron. An electron can spin in only one of two directions (sometimes called up and down). The Pauli exclusion principle (Wolfgang Pauli, Nobel Prize 1945) states thatno two electrons in the same atom can have identical values for all four of their quantum numbers.


    • [PDF File]CHEMICAL FORMULAS AND FORMULA WEIGHT CALCULATIONS

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      4. Multiply the number of atoms times the atomic weights to get the total mass of each element 5. Add the total masses of all the elements. Examples: 1. Calculate the formula weight of sodium chloride, NaCl. Answer: Set up a table listing the elements in the compound, the number of atoms of each element, and the atomic weight of each element.


    • [PDF File]MO Diagrams for Diatomic Molecules

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      Summary MO Theory • LCAO-MO Theory is a simple method for predicting the approximate electronic structure of molecules. • Atomic orbitals must have the proper symmetry and energy to interact and form molecular orbitals. • Photoelectron spectroscopy provides useful information on the energies of atomic orbitals. • Next we’ll see that symmetry will help us treat larger molecules in


    • [PDF File]Lecture 06 High Resolution Mass Spectrometry (HRMS)

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      Mass Terminology • Elemental Composition: –Molecular formula showing the exact number of atoms of each element in the molecule. • Nominal Molecular Weight: 291 –Sum of nominal masses of the elements • Average Molecular Weight: 291.3654 (Do not use this value for mass spectrometry) –Calculated using the average atomic weight of each element present in


    • [PDF File]Atomic Structure Notes - shakopee.k12.mn.us

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      number, name and atomic mass. - Write the atomic number at the top of the square. - Write the element’s name under the symbol. - Write the atomic mass at the bottom of the square. Step 2: Determine the number of protons, neutrons, and electrons in each element. Step 3: Create an atomic structure diagram for each element.


    • [PDF File]Answer Key, Problem Set 3 Complete Version (with explanations)

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      Answer Key, Problem Set 3 PS3-3 5. 3.29 & 3.30. Classify each compound as ionic or molecular (ADD parts (ii) and (iii): (ii) In each case, state the type of nanoscopic entities (either atoms, molecules, or ions) that make up a macroscopic sample of the compound; (iii); For each ionic compound write the (full) formula of the cation (i.e., including its charge as a superscript on the right.


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