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1 While you wait Naturally occurring rubidium consists of just two isotopes. One of the isotopes consists of atoms having a mass of amu; the other of amu. What is the percent natural abundance of the heavier isotope?
2 What questions did you ask? What is relevant information and what isn t? What s my best first step? How am I organizing the information? How has my ability to do these problems changed over the last week?
3 Kahoot.it
4 Today s Learning Objectives Name molecular and ionic compounds using proper nomenclature rules Identify and name polyatomic anions and cations Name oxyanions and oxyacids Balance a chemical equation Create a balanced chemical equation from a written description Calculate molecular weights given a molecular formula Use Avogadro s number to convert between moles and number of items Use percent composition to determine the identity of molecules
5 Today s Goals ü Review nomenclature rules q Practice empirical analyses and using Avogadro s number q Small group work q Review worksheet problems together q Reflect and make a plan
6 A compound contains, by mass, 40.0% carbon, 6.71% hydrogen, and 53.3% oxygen. A mole sample of this compound weighs 28.8 g. The molecular formula of this compound is: a. C 2 H 4 O 2 b. C 3 H 6 O 3 c. C 2 H 4 O d. CH 2 O e. C 4 H 7 O 2 Do I understand the numbers/information given? What information is not given but I can figure out? How does all of the information fit together? Am I thinking through HOW I am using the information?
7 Carbon has three allotropes (materials that are just made of one element): buckyballs, graphite, and diamond. The Hope Diamond weighs in at a magnificent carats, where one carat weighs exactly 200 mg. How many carbon atoms are present in the Hope Diamond? Do I understand the numbers/information given? What information is not given but I can figure out? Can I make a plan before writing numbers? Am I thinking through HOW I am using the information?
8 Work at your table to answer the questions on the worksheet for about 15 minutes.
9 Balance the following chemical equations: The development reaction in photography AgBr + NaOH + C 6 H 6 O 2 à Ag + H 2 O + NaBr + C 6 H 4 O 2 The explosion of ammonium nitrate: NH 4 NO 3 à N 2 + O 2 + H 2 O What strategies work best for me? Are there atoms/ions/polyatomics that show up on both sides?
10 When iron pyrite (FeS 2 ) is heated in oxygen gas, the process known as roasting forms sulfur dioxide and iron (III) oxide. When the equation for this process is completed and balanced, what is the smallest whole number coefficient for oxygen gas? Do I know the naming rules well enough to write an equation? Is there something I should balance first? Last?
11 A g sample of a compound containing only antimony and oxygen was found to contain g of antimony and g of oxygen. What is the simplest formula for the compound? a. SbO b. SbO 2 c. Sb 3 O 4 d. Sb 2 O 5 e. Sb 2 O 3 Do I understand the numbers/information given? What information is not given but I can figure out? Can I make a plan before writing numbers? Am I thinking through HOW I am using the information?
12 A certain metal sulfide, MS 2, is used extensively as a high-temperature lubricant. If MS 2 is 40.06% sulfur by mass, what is the identity of the metal M? Do I understand the numbers/information given? Are there assumptions I need to make? Can I make a plan before writing numbers? Am I thinking through HOW I am using the information?
13 Hemoglobin (C 2952 H 4664 N 812 O 832 S 8 Fe 4 ) carries oxygen all over the body. A. Calculate the molar mass of hemoglobin. B. You have about 5.0 L of blood in your body. Every ml of blood contains approximately 5.0 x 10 9 red blood cells, and every red blood cell contains 2.8 x 10 8 hemoglobin molecules. Calculate the mass of hemoglobin molecules, in grams, floating around in your body. Do I understand the numbers/information given? Can I make a plan before writing numbers? Am I thinking through HOW I am using the information? What might the answer look like?
14 How many molecules and moles of hemoglobin do you have? Do I understand the numbers/information given? Can I make a plan before writing numbers? Am I thinking through HOW I am using the information? What might the answer look like?
15 What s your plan for Monday? What have you found today that you didn t understand as well as you thought you did? Do you have a good study plan? When should you start preparing for the exam? What resources do you have to study? When would you like to feel ready? What will help you stay focused? Get in the way?
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