PPT-Average atomic mass worksheet

1 Rubidium has two common isotopes 85 Rb and 87 Rb If the abundance of 85 Rb is 722 and the abundance of 87 Rb is 278 what is the average atomic mass of rubidium PROCEDURE. #1: Rubidium has two common isotopes, . 85. Rb and . 87. Rb. . If the abundance of . 85. Rb is 72.2% and the abundance of . 87. Rb is 27.8%, what is the average atomic mass of rubidium?. PROCEDURE:. 2) QUIZ #17 – Last Quiz of the Year!!. Go to. . . join.quizizz.com. Type in . . . 176090. Make sure you put your first name and last initial. 3) Finish Worksheet #31. 4) Get CHILL Check #6 ready (Worksheets #26-30) for tomorrow. The lab technician shown here is using a magnifying lens to examine a bacterial culture in a petri dish. When scientists cannot see the details of what they study, they try to obtain experimental data that help fill in the picture.. Lesson objectives relative mass. Understand the term ‘isotopes’. Define the terms ‘relative isotopic mass’ and ‘relative atomic mass’ based on the . 12. C scale. Understand the terms ‘relative molecular mass’ and ‘relative formula mass’ including calculating these from relative atomic masses . I. Foundations of the Atomic Theory. A. 400 B.C. –Democritus. 1. Defined nature’s basic particles as . atoms. a. means indivisible. B. 350 B.C. Aristotle. 1. said matter was made of the 4 “elements”. Pre-AP Chemistry. Charles Page High School. Stephen L. Cotton . Section 4.1 Defining the Atom. OBJECTIVES:. Describe. Democritus’s ideas about atoms.. Section 4.1 Defining the Atom. OBJECTIVES:. Explain. Chapter 3. Types of Models – Why do we use models?. Physical Model vs. Conceptual Model. Physical model. is a representation of a very large or small object shown at a convenient scale. . FDR receives a letter from Albert Einstein. Informed FDR of recent developments in splitting uranium atoms. Could lead to “extremely powerful bombs of a new type” by means of nuclear fission. Nucleus absorbs a neutron, breaks into two equal fragments. Atomic mass. Atoms of different elements have different masses. . Mass of a single atom is incredibly small so a special unit called atomic mass unit (. amu. ) is used. . Atomic Mass. Atoms are composed of three particles:. Structure Of An Atom. Parts. Found in Nucleus. Protons . Neutrons. Found in shells or orbits. Electrons. Protons. Found . in. the . nucleus. Positively. charged. Determines. the . identity. Atomic . Mass Number. Where did that decimal come from?. Calculating Average Atomic Mass . I CAN . calculate the Average Atomic Mass Number of an element from its isotope data. .. The Case for a Decimal . Atoms of the same element . can. have different . mass numbers.. Isotopes. How can atoms of the same element end up with a different mass?. Shoulder Partners. Frederick Soddy. (1877-1956) proposed the idea of isotopes in 1912. Daltons Atomic Theory. 1. All elements are composed of tiny . indivisible. particles called atoms.. 2. Atoms of the same element are identical. The atoms of one element are different from the atoms of another element.. In your notes…. Draw a model of an atom that best represents each component of that atom.. Foundations of Atomic Theory. Particle Theory of Matter. Democritus in 400 B.C.. Stated that nature’s basic particle was the atom (“indivisible” in Greek). .