For ease and simplicity, consider some
of the following pointers below. If necessary, an email link to
the webmaster can be found at the bottom of each page.
- When entering the names of formulas, numbers cannot be
subscripted. Therefore, "H2O" is an acceptable entry for the
formula of water.
- Element symbols are case sensitive. An entry of "H2O" will
be marked correct, but "h2O" would be marked as incorrect.
Similarly, "NACL" would be marked incorrect. The only correct
entry is "NaCl".
- When entering names of compounds, Roman numerals are sometimes
necessary. For the formula "CuSO4", the only acceptable
response is "copper(II) sulfate".
- Names of compounds should not be capitalized. Therefore,
"water" is the only acceptable response for the name of the compound
"H2O".
- When correcting your responses, the site only counts your first
response towards your score. If your first response is
incorrect, you can have another chance (as many as you like) to
correct yourself, but your score will only be marked wrong once.
If you get the problem correct after your first response, you will
not be given credit for a correct response. Only your first
entry counts towards the score.
- Numbers that have large or small powers of ten (e.g. Avogadro's
number) should be entered using "E". Thus, Avogadro's number
is corrected inputted as 6.022E+23. A constant with a negative
exponent such as Planck's constant would be correctly inputted as
6.626E-34.
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