AP Chemistry Summer Assignment

Transcription

1 AP Chemistry Summer Assignment AP Chemistry Students: This summer you are responsible for the following assignments: 1. You need to master the formulas, charges, and names of the common ions. On the second day of the school year, you will be given a quiz on these ions. You will be asked to: o write the names of these ions when given the formula and charge o write the formula and charge when given the names I have included several resources in this packet. First, there is a list of the ions that you must know on the first day. This list also has, on the back, some suggestions for making the process of memorization easier. For instance, many of you will remember that most of the monatomic ions have charges that are directly related to their placement on the periodic table. There are naming patterns that greatly simplify the learning of the polyatomic ions as well. Also included is a copy of the periodic table used in AP Chemistry. Notice that this is not the table used in first year chemistry. The AP table is the same that the College Board allows you to use on the AP Chemistry test. Notice that it has the symbols of the elements but not the written names. You need to take that fact into consideration when studying for the quiz! I have included a sheet of flashcards for the polyatomic ions that you must learn. I strongly suggest that you cut them out and begin memorizing them immediately. Use the hints on the common ions sheet to help you reduce the amount of memorizing that you must do. 2. You need to check out the AP Chemistry Book before the end of school as you will be working on problems from Chapters 13. You need to read all three chapters and complete the following assignments: You need to SHOW YOUR WORK, include UNITS and use SIGNIFICANT FIGURES in your answers. o Chapter 1 page 34 #3033, 36, 37, 39, 47, 53, 63, 66, 68, 73, 77, 79, 81, 82, 86, 87, 88 o Chapter 2 page 74 #33, 34, 47, 48, 49, 52, 55, 56, 61, 63, 66, 67, 70, 72, 75, 88, 89 o Chapter 3 page 128 #33, 38, 42, 47, 49, 61, 53, 55, 57, 66, 73, 76, 81, 86, 94, 100, 107, 110, 114, 115 o We will review some additional problems the first week of school and take a test on all three chapters on Friday of the first week of school. I look forward to seeing you all at the beginning of the next school year. If you visit sciencegeek.net, there are some review activities in the AP Chemistry section that will give you an idea on whether or not you have adequately mastered the summer assignment. The AP Chemistry test is the very first AP Test and is on Monday, May 7, 2018 at 8:00 am. Good luck and have a great summer!

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3 Tips for Learning the Ions From the Table These are ions can be organized into two groups. 1. Their place on the table suggests the charge on the ion, since the neutral atom gains or loses a predictable number of electrons in order to obtain a noble gas configuration. This was a focus in first year chemistry, so if you are unsure what this means, get help BEFORE the start of the year. a. All Group 1 Elements (alkali metals) lose one electron to form an ion with a 1+ charge b. All Group 2 Elements (alkaline earth metals) lose two electrons to form an ion with a 2+ charge c. Group 13 metals like aluminum lose three electrons to form an ion with a 3+ charge d. All Group 17 Elements (halogens) gain one electron to form an ion with a 1 charge e. All Group 16 nonmetals gain two electrons to form an ion with a 2 charge f. All Group 15 nonmetals gain three electrons to form an ion with a 3 charge Notice that cations keep their name (sodium ion, calcium ion) while anions get an ide ending (chloride ion, oxide ion). 2. Metals that can form more than one ion will have their positive charge denoted by a roman numeral in parenthesis immediately next to the name of the Polyatomic Anions Most of the work on memorization occurs with these ions, but there are a number of patterns that can greatly reduce the amount of memorizing that one must do. 1. ate anions have one more oxygen then the ite ion, but the same charge. If you memorize the ate ions, then you should be able to derive the formula for the ite ion and viceversa. a. sulfate is SO 4 2, so sulfite has the same charge but one less oxygen (SO 3 2 ) b. nitrate is NO 3, so nitrite has the same charge but one less oxygen (NO 2 ) 2. If you know that a sufate ion is SO 2 4 then to get the formula for hydrogen sulfate ion, you add a hydrogen ion to the front of the formula. Since a hydrogen ion has a 1+ charge, the net charge on the new ion is less negative by one. a. Example: 3 PO 4 2 HPO 4 H 2 PO 4 phosphate hydrogen phosphate dihydrogen phosphate 3. Learn the hypochlorite chlorite chlorate perchlorate series, and you also know the series containing iodite/iodate as well as bromite/bromate. a. The relationship between the ite and ate ion is predictable, as always. Learn one and you know the other. b. The prefix hypo means under or too little (think hypodermic, hypothermic or hypoglycemia ) i. Hypochlorite is under chlorite, meaning it has one less oxygen c. The prefix hyper means above or too much (think hyperkinetic ) i. the prefix per is derived from hyper so perchlorate (hyperchlorate) has one more oxygen than chlorate. d. Notice how this sequence increases in oxygen while retaining the same charge: ClO ClO 2 ClO 3 ClO 4 hypochlorite chlorite chlorate perchlorate

4 Common Ions and Their Charges A mastery of the common ions, their formulas and their charges, is essential to success in AP Chemistry. You are expected to know all of these ions on the first day of class, when I will give you a quiz on them. You will always be allowed a periodic table, which makes indentifying the ions on the left automatic. For tips on learning these ions, see the opposite side of this page. From the table: Ions to Memorize Cations Name Cations Name H + Hydrogen Ag + Silver Li + Lithium Zn 2+ Zinc Na + Sodium 2+ Hg 2 Mercury(I) K + Potassium + NH 4 Ammonium Rb + Rubidium Cs + Cesium Be 2+ Beryllium Anions Name Mg 2+ Magnesium NO 2 Nitrite Ca 2+ Calcium NO 3 Nitrate Ba 2+ Barium 2 SO 3 Sulfite Sr 2+ Strontium 2 SO 4 Sulfate Al 3+ Aluminum HSO 4 Hydrogen sulfate (bisulfate) OH Hydroxide Anions Name CN Cyanide H Hydride 3 PO 4 Phosphate F Fluoride 2 HPO 4 Hydrogen phosphate Cl Chloride H 2 PO 4 Dihydrogen phosphate Br Bromide NCS Thiocyanate I Iodide 2 CO 3 Carbonate O 2 Oxide HCO 3 Hydrogen carbonate (bicarbonate) S 2 Sulfide ClO Hypochlorite Se 2 Selenide ClO 2 Chlorite N 3 Nitride ClO 3 Chlorate P 3 Phosphide ClO 4 Perchlorate As 3 Arsenide BrO Hypobromite Type II Cations Name BrO 2 Bromite Fe 3+ Iron(III) BrO 3 Bromate Fe 2+ Iron(II) BrO 4 Perbromate Cu 2+ Copper(II) IO Hypoiodite Cu + Copper(I) IO 2 iodite Co 3+ Cobalt(III) IO 3 iodate Co 2+ Cobalt(II) IO 4 Periodate Sn 4+ Tin(IV) C 2 H 3 O 2 Acetate Sn 2+ Tin(II) MnO 4 Permanganate Pb 4+ Lead(IV) 2 Cr 2 O 7 Dichromate Pb 2+ Lead(II) 2 CrO 4 Chromate Hg 2+ Mercury(II) 2 O 2 Peroxide 2 C 2 O 4 Oxalate NH 2 Amide 3 BO 3 Borate 2 S 2 O 3 Thiosulfate

5 Sulfite Sulfate Hydrogen sulfate Phosphate Dihydrogen Phosphate Hydrogen Phosphate Nitrite Nitrate Ammonium Thiocyanate Carbonate Hydrogen carbonate Borate Chromate Dichromate Permanganate Oxalate Amide Hydroxide Cyanide Acetate Peroxide Hypochlorite Chlorite Chlorate Perchlorate Thiosulfate

6 HSO 4 SO 4 2 SO 3 2 HPO 4 2 H 2 PO 4 PO 4 3 NH 4 + NO 3 NO 2 HCO 3 2 CO NCS 3 SCN Cr 2 O 7 2 CrO 4 2 BO 3 3 NH 2 C 2 O 4 2 MnO 4 C 2 H 3 O 2 CH 3 COO CN OH ClO 2 ClO O 2 2 S 2 O 3 2 ClO 4 ClO 3