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VCE Stuff => VCE Science => VCE Mathematics/Science/Technology => VCE Subjects + Help => VCE Chemistry => Topic started by: Andiio on June 14, 2011, 07:59:39 pm

Title: NEAP 2011 Q
Post by: Andiio on June 14, 2011, 07:59:39 pm: Section B, Q2d; are we supposed to answer with 2 sig figs (because of the 10g) or 3?

Thanks!
Title: Re: NEAP 2011 Q
Post by: VivaTequila on June 14, 2011, 08:04:11 pm: Can you write out the question? I can't find my exam list on my computer...
Title: Re: NEAP 2011 Q
Post by: lilaznkev1n on June 14, 2011, 08:05:42 pm: 10g isn't two sig figs as there is no decimal point after it so it is assumed infinite.
the lowest is 3 in that question being 15.0g or 20.0mL
Title: Re: NEAP 2011 Q
Post by: VivaTequila on June 14, 2011, 08:06:50 pm: Quote from: lilaznkev1n on June 14, 2011, 08:05:42 pm
10g isn't two sig figs as there is no decimal point after it so it is assumed infinite.
the lowest is 3 in that question being 15.0g or 20.0mL
is this correct?
Title: Re: NEAP 2011 Q
Post by: lilaznkev1n on June 14, 2011, 08:11:46 pm: Quote from: VivaTequila on June 14, 2011, 08:06:50 pm
Quote from: lilaznkev1n on June 14, 2011, 08:05:42 pm
10g isn't two sig figs as there is no decimal point after it so it is assumed infinite.
the lowest is 3 in that question being 15.0g or 20.0mL
is this correct?
Hmm I'm probably wrong lol not sure as I always use the lowest sig figs that are in decimals. The solutions gave it to 3 sig figs so I'm not sure.
Title: Re: NEAP 2011 Q
Post by: cltf on June 14, 2011, 08:15:53 pm: i was told sig figs only apply when there is a decimal, because logically speak why would they write 10g, then 15.0g apart from the fact they're trying to trick you.
Title: Re: NEAP 2011 Q
Post by: Andiio on June 14, 2011, 08:22:21 pm: Haha whoops totally forgot about that.

Another Q, do the sigfigs of absorbance values count? I don't think they do, since they're literally always set to 2 dp?
Title: Re: NEAP 2011 Q
Post by: VivaTequila on June 14, 2011, 08:32:06 pm: Quote from: Andiio on June 14, 2011, 08:22:21 pm
Haha whoops totally forgot about that.

Another Q, do the sigfigs of absorbance values count? I don't think they do, since they're literally always set to 2 dp?
also want to know this
Title: Re: NEAP 2011 Q
Post by: cltf on June 14, 2011, 09:19:24 pm: don't follow the absorbance value, its not acutally a unit of measurement as per say, if you get what I mean.