<p>My AP Chem summer assignment is to memorize the charges and names of polyatomic ions
i.e. Arsenate Ion - AsO4-3</p>
<p>is there any videos or books that gives you tip to easily memorize these?>????</p>
<p>URgent help.. Thanks guys
!!!</p>
<p>I had to learn them for general chemistry. Make flash cards and flip through them twice a day. You will start to pick up on the patterns and have them memorized in no time. </p>
<p>Try quizzing yourself as well. You could make a quiz yourself or use programs online. For example, you could write out the names of the ions and then write in the formulas without looking. This is what we did in chem sophomore year and after about 2-3 weeks I had most of them down.</p>
<p>Thanks!!</p>
<p>I cant believe i havent thought of flashcard idea…</p>
<p>Thanks so much !</p>
<p>A helpful mnemonic I learned:</p>
<p>Nick the Camel ate a Clam and a Crayon for Supper in Phoenix.</p>
<p>For nitrate, carbonate, chlorate, chromate, sulfate, and phosphate, respectively.</p>
<p>The # of consonants in the word = the # of oxygens
The # of vowels = the charge.</p>
<p>Might sound dumb, but it saved me in Pre-AP and AP chem.</p>
<p>Flashcards work well. Also, remember that -ites have less oxygen than -ates generally; sulfate is SO4 2- and sulfite is SO3 2-; phosphate is PO4 3- and phosphite is PO3 3-.</p>
<p>Thanks everybody esp kamzarro!!!</p>
<p>saved my a$$</p>
<p>When I talked to the AP Chemistry teacher on the last day of school, she didn’t say anything about memorizing the poly-atomic ions. Now I’m a little bit worried. She only told me study Honors Chem. material. My Hon. Chem. teacher Sophomore year told me that there’s no reason to memorize these things, because they’re here to be used as resources.</p>
<p>I doubt its mandatory dont stress too much she would prob go over it during school time</p>
<p>Your AP Chem teacher will probably go over it for you, but be ready to be expected to know all of them fairly early into the year.</p>
<p>Personally my AP chem teacher did not go over polyatomic ions. We were told when we get our summer HW that we had to have them memorized and we would have a quiz on them the first day of class (we did, many kids bombed it when it was intended to be easy points). Honestly, it saves you so much trouble in the long run, there’s no reason not to get them memorized now. It makes the class that much easier. </p>
<p>Just my two cents. Also yeah you’re def. expected to know your ions on the AP chem exam… I’ve seen some students get reactions that they could have gotten right wrong, simply because they were unsure about their ions.</p>
<p>We had a list of 25 or so to memorize. Never heard of the arsenate ion though haha! Memorize common ones and their variants, even if your teacher doesn’t make you. They appear so often it will pay off in the end.</p>
<p>If you want to test your ability, here’s a Sporcle quiz: [Polyatomic</a> Ions Quiz](<a href=“http://www.sporcle.com/games/RyanWitchey/Chem_Anions]Polyatomic”>Naming Polyatomic Ions Quiz)</p>
<p>It’s likely more than you’ll even have to know, so if you can get all of these, and know it the other way, then you’re probably more than prepared.</p>
<p>^ Oh cool, thanks.</p>
<p>We had to memorize a bunch of these for H Chemistry, and will have to use more of them when I take AP Chem next year.
Here’s a little pattern that might help you out.
start with the “ate” ion. Add an O= “per…ate”. Subtract an O=“ite” Subtract two O’s= “hypo…ite”.</p>
<p>It’s easy to see in polyatomics with chlorine. If you start out with chlorate CLO3 1-, you can add an O to get perchlorate, or CLO4 1-. You can also subtract an O to get CLO2 1-, or chlorite. Then subtracting another O yields CLO 1-, or hypochlorite. Just a pattern that can help you out with some of the phosphates, phosphites, sulfates, etc. just need to know what sulfate, phosphate, etc. is. </p>
<p>Don’t worry about it- it’s amazing how much I remember my class stressing about little mini quizzes about polyatomics, and by the end of the year (even within a few weeks), we knew them cold just from using them.</p>
<p>About the notecard idea, when I took my chemistry class (not AP but not important) I used my ipod and FlashcardDeluxe by OrangeorApple. It was really easy to set up the notecards, could be done on the computer, then imported. I recommend it if you’d rather do that than carry around a bunch of notecards. Also, it keeps track of the ones you get right and wrong and then sorts them to make sure you learn them all. Hope that helps :)</p>