BEAN BAG ISOTOPES:ABUNDANCE AND ATOMIC MASS LAB Prelab A new atomic theory‚ in which all atoms of the same element are identical to one another and equal in mass‚ was proposed by the scientist Dalton. Although the theory had its flaws and was simple‚ it was revolutionary. Scientists became able to study the actual structure and mass of atoms after the discovery of radioactivity. Soon‚ isotopes were discovered‚ as atoms of the same element which have been built up to have different masses. Purpose
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̅ E. sulfate ion = SO42 ̅ 5 How many molecules are in 0.25 mole of Na2O? A. 4.5 × 10(23) B. 0.75 C. 1.5 × 10(23) D. 4.2 × 10( ̅ 25) E. 0.25 6 Calculate the molar mass of Na2SO4. A. 94.05 g/mol B. 71.06 g/mol C. 142.05 amu D. 142.05 g/mol E. 94.05 amu 7 If 4.05 × 1023 molecules of a substance have a mass of 86.2 g‚ what is the molar mass of the substance? A. 128 g/mol B. 3.49 × 1025 g/mol C. 2.13 × 1022 g/mol D. 4.70 × 1021 g/mol E. 58.0 g/mol 8 A 6.25 g sample of magnetite
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Negligible (too small to count) What is the mass of an electron? 1 AMU or g What is the mass of a neutron? Increasing atomic number Elements on the periodic table are arranged in order of … # of electrons = # of protons What is the relationship between protons and electrons? 2 How many electrons can the first
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| ANTH100 Assignment 1 Heather Hartwig American Military University October 21‚ 2012 Assignment 1 1) Discuss what evolution is in terms of physical anthropology. Evolution refers to "change over time". In terms of physical anthropology‚ evolution is changes over time in living organisms. This means that living things have passed their traits from one generation to the next. There are very little changes that occur with each generation‚ but over time these changes accumulate in each
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d 1. What is the correct formula for the carbonate ion? (a) CH3COO(b) Cl(c) CO22(d) CO32(e) (COO-)2 c 2. What is the name of Fe(OH)3? (a) (b) (c) iron hydroxide iron trihydroxide iron (III) hydroxide (d) (e) iron (II) hydroxide none of these d 3. From the following ionic compounds‚ choose the name-formula pair that is not correctly matched. (a) (b) (c) (d) (e) sodium sulfide ammonium nitrate zinc hydroxide sodium sulfate calcium oxide Na2S NH4NO3 Zn(OH)2 Na2SO3 CaO b 4. How many
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Isotopes and Atomic Mass It’s Vegium I. Purpose The purpose of this lab is to determine the average weights of each isotope of the “element” vegium‚ determine the relative abundance of isotopes of vegium‚ and calculate from experimental data the atomic mass of vegium. II. Apparatus Sample of vegium‚ balance‚ weighing cups III. Data Tables | |Beanium |Peaium |Cornium |Total
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atomic weight. (b) Silicon has three naturally-occurring isotopes as shown in the table below. On the basis of this data‚ confirm that the average atomic weight of Si is 28.0854 amu. |Silicon Isotope |Natural Abundance |Atomic mass of | | | |isotope (amu) | |28Si |92.23 % |27.9769 | |29Si |4.68 % |28.9765 | |30Si |3.09 % |29.9738 |
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IDENTITY IS RELATED TO ONE’S POSITION AND PERSPECTIVE. DO YOU AGREE? DISCUSS. Identity is all about nature and nurture. Identity also creates a sense of belonging. Identity starts from the family and continue through social change which occur through one’s life. A person can have several identities as the behavior of a person changes from one to another depending on whom he is interacting with. Battle Hymn Of The Tiger Mother ignited a global parenting debate with its story of the identity of a
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and the first sentence of each paragraph is not indented (OWL‚ 2009). However‚ as I was reading this week’s lesson and other classmates’ forums and comments here at AMU‚ I have noticed that the paragraphs are not indented as they are in the Purdue Online writing. This has me confused and I would like to know which is the correct form‚ AMU or the
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The Essence of Chemistry & Significant Contributors to scientific development | 1 HONORS CHEMISTRY Introduction to Chemistry Notes Make sure you can understand these basic questions and concepts so that you can build on the basics to understand the complex material These are just the basics of what is covered in class lectures. This should not be the only resources you use to study. Who developed the concept of atoms? What are atoms? What is the Law of conservation of mass? What is the law of definite
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