1. Calculate the molecular mass/formula weight for: KHSO3 2. How many of each type of atom are present in 0.667 mol of [CrCl2(NH3)4]Cl 3. Calculate the molecular formula for the compound that contains 40.92% C‚ 4.58% H‚ 54.50% O‚ and has a molecular mass of 176 u. 4. When 1.019 g of potassium reacts with O2‚ it forms 1.860 g of a rather strange compound. Find the empirical formula of this compound‚ and explain why it is strange. 5. How many grams of BaSO4 (s) are formed when an excess of BaCl2
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a unit for measuring pressure Avogadro’s number = 6.02 x 1023 volume of 1 mol of any gas at STP = 22.4 L Ion- atoms or groups of atoms that have a positive or negative charge Anion- negatively charged ion Cation- positively charged ion Molecules- small‚ electrically neutral “units”; maintain the properties of that substance Formula unit- the lowest whole number ratio of ions in an ionic compound Products are on the right side of the yield sign Reactants are on the left side of the yield
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Formulas Chapter: 1 Section: 2 * The empirical formula: the formula that gives the simplest ratio of the number of atoms in the compound. Determination of the empirical formula: 1. Find the mass in grams of each element. 2. Find the number of moles. 3. Find the simplest ratio of moles. Question 1. Mass of elements in g. 2. Number of moles of each element. 3. Simple ratio of elements. Practice problems * A 2.765 g sample of lead oxide was heated in a stream
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| | |2 |9/2 Lec |Ch. 2 Atoms‚ Molecules‚ & Ions | |HM1 | | |9/2 Lab |Exp. 2 Paper Chromatography |Exp. 1 Advanced study assignment (ASA1) |Quiz 1‚ ASA2 | | |9/4 Lec |Ch. 2 Atoms‚ Molecules‚ & Ions |Homework 2 (HM2) |
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contains nine double bonds and four rings. Based on this additional information‚ what is the formula for terfenedine? (c) Explain the origin of the peak at m/z = 472. (12 pts.) 9. Explain why all protons in a molecule do not absorb rf (radio frequency) energy at the same frequency. (5 pts.) 10. Answer the following questions. (10 pts.) (a) How many groups
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Worked solutions to student book questions Chapter 2 Analysis by mass Q1. a b Why was the soup sample in Worked Example 2.1 heated to 110°C? Why was it necessary to weigh the sample four times? A1. a b The soup was heated above 100°C to evaporate water from the sample. By repeatedly heating the sample until the mass remained unchanged‚ the analyst could be sure that all the water had been removed. Q2. Some laboratories use microwave ovens in place of conventional ovens to
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Empirical and Molecular Formula | Key Concepts * Empirical Formula of a compound shows the ratio of elements present in a compound. * Molecular Formula of a compound shows how many atoms of each element are present in a molecule of the compound. * The empirical formula mass of a compound refers to the sum of the atomic masses of the elements present in the empirical formula. * The Molecular Mass (formula mass‚ formula weight or molecular weight) of a compound is a multiple of the empirical
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number of neutrons -The masses of isotopes are different because they have a different number of protons and neutrons Atoms Unite! Let’s Make a Bond Webquest Introduction A chemical bond form when atoms combine to form stable compounds and molecules. In this activity you will learn about different types of chemical bonds and how they are formed. You will also learn why some atoms bond with other atoms and why some do not bond. Complete the worksheet as you learn about chemical bonding
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scattered specifically by mass‚ which allowed Ashton to study isotopes. In 1920‚ a professor named A. J. Dempster created a magnetic deflection instrument focusing on direction. He also developed the first impact source of electrons that ionizes molecules with a beam of electrons. This is still used today in modern mass spectrometers. By the end of the 1930’s mass spectrometry had become a reputable method for the separation of atomic ions by mass. The mass spectrometer has many common uses and
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such as computers and television‚ and a host of essential services that we take for granted. However‚ electricity has much more important aspects because it is a fundamental feature of all matter. Electricity is the force that holds together the molecules and atoms of all
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