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July 27, 2025, 11:28:56 am

Author Topic: MATHS ( SIG FIG ) AND ALSO CHEM QUESTION PART 2 .. PLEASE HELP  (Read 474 times)  Share 

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matt123

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okkk guys
so i got a few questions from the book that im stuck on ..

first one is a maths one

14.00/37.800 X 6.022 = TO THE right amount of sig figs !!
the options are

2.23037
2.23
2.2
2.230
2.2304

i think its 2.230

can some 1 please help me?

2 also
chem questions

aluminium ion al3+ has ..
i said ... 13 protons and 10 electrons .. is this correct?

also 3
gadolinium oxide contains 86.76 mass % GD. .. determine its empirical forumla ... i said Gd203... is this correct ?



also 4 is the correct name for N203 = dinitrogen trioxide?

also 5
 
which of the following is most likely to form when an S atom forms an ion
S6+
S2-
S4+
S4-
none of the above
and i said ... S2- .. is this correct?


please help me !!

many many thanks in advanced guys.


2009 : Physical Education
2010  ATAR : 91.45 , Bio , Chem , Methods , Psychology , English
Completed VCE at the age of 16.
2011 : Bachelor of pharmacy
2012 : Hopefully med? " crosses fingers"

jane1234

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Re: MATHS ( SIG FIG ) AND ALSO CHEM QUESTION PART 2 .. PLEASE HELP
« Reply #1 on: March 18, 2011, 04:55:19 pm »
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Quote
14.00/37.800 X 6.022 = TO THE right amount of sig figs !!
the options are

2.23037
2.23
2.2
2.230
2.2304

i think its 2.230

can some 1 please help me?

Think you're right ... generally it is the least number of sig figures given in the question...

matt123

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Re: MATHS ( SIG FIG ) AND ALSO CHEM QUESTION PART 2 .. PLEASE HELP
« Reply #2 on: March 18, 2011, 07:15:37 pm »
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hmmm ok i hope so

some one pleasseee help me with the rest!
ahah
2009 : Physical Education
2010  ATAR : 91.45 , Bio , Chem , Methods , Psychology , English
Completed VCE at the age of 16.
2011 : Bachelor of pharmacy
2012 : Hopefully med? " crosses fingers"

pi

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Re: MATHS ( SIG FIG ) AND ALSO CHEM QUESTION PART 2 .. PLEASE HELP
« Reply #3 on: March 18, 2011, 07:22:21 pm »
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Quote
also 5
 
which of the following is most likely to form when an S atom forms an ion
S6+
S2-
S4+
S4-
none of the above
and i said ... S2- .. is this correct?
Correct, sulfide ions are S2-


Quote
2 also
chem questions

aluminium ion al3+ has ..
i said ... 13 protons and 10 electrons .. is this correct?
Correct


Quote
also 4 is the correct name for N203 = dinitrogen trioxide?
Correct


Quote
also 3
gadolinium oxide contains 86.76 mass % GD. .. determine its empirical forumla ... i said Gd203... is this correct ?
Correct
« Last Edit: March 18, 2011, 07:25:17 pm by Rohitpi »