Busy. Please wait.

show password
Forgot Password?

Don't have an account?  Sign up 

Username is available taken
show password


Make sure to remember your password. If you forget it there is no way for StudyStack to send you a reset link. You would need to create a new account.
We do not share your email address with others. It is only used to allow you to reset your password. For details read our Privacy Policy and Terms of Service.

Already a StudyStack user? Log In

Reset Password
Enter the associated with your account, and we'll email you a link to reset your password.
Don't know
remaining cards
To flip the current card, click it or press the Spacebar key.  To move the current card to one of the three colored boxes, click on the box.  You may also press the UP ARROW key to move the card to the "Know" box, the DOWN ARROW key to move the card to the "Don't know" box, or the RIGHT ARROW key to move the card to the Remaining box.  You may also click on the card displayed in any of the three boxes to bring that card back to the center.

Pass complete!

"Know" box contains:
Time elapsed:
restart all cards
Embed Code - If you would like this activity on your web page, copy the script below and paste it into your web page.

  Normal Size     Small Size show me how


ammonium NH4+1
copper 1, Cuprous Cu+1
hydrogen, hydrodium H+1, H3O+1
lithium Li+1
potassium K+1
silver Ag+1
sodium Na+1
barium Ba+1
cadmium Ca+2
calcium Ca+2
chromium II, chromous Cr+2
cobalt II, cobaltous Co+2
copper II, cupric Cu+2
iron II, ferrous Fe+2
lead II, plumbous Pb+2
magnesium Mg+2
maganese II, manganous Mn+2
mercury I, mercurous Hg2+2
nickel II, nickelous Ni+2
strontium Sr+2
tin II, stannous Sn+2
zinc Zn+2
aluminum Al+3
chrominum III, chromic Cr+3
iron III, ferric Fe+3
cobalt III, cobaltic Co+3
scandium Sc+3
lead IV, plumbic Pb+4
tin IV, stannic Sn+4
acetate CH3COO -1 or C2H3O2 -1
bromide Br -1
hydrogen carbonate or bicarbonate HCO3 -1
chloride Cl -1
hypochlorite ClO -1
chlorite ClO2 -1
chlorate ClO3 -1
perchlorate ClO4 -1
fluoride F -1
hydroxide OH -1
iodide I -1
nitrate NO2 -1
permanganate MnO4 -1
hydrogen oxalate or binoxalate HC2O4 -1
dihydrogen phosphate H2PO4 -1
hydrogen sulfate or bisulfate HSO4 -1
hydrogen sulfide or bisulfide HS -1
hydrogen sulfite or bisufite HSO3 -1
carbonate CO3 -2
chromate CrO4 -2
dichromate Cr2O7 -2
oxalate C2O4 -2
monohydrogen phosphate HPO4 -2
sulfide S -2
sulfite SO3 -2
sulfate SO4 -2
nitride N -3
phosphide P -3
Phosphate PO4 -3