most recent 30 from http://merspi.com.au 2010-07-30T11:02:20Z http://merspi.com.au/feeds/tag/unit-conversion http://www.creativecommons.org/licenses/by-nc/2.5/rdf http://merspi.com.au/questions/712/conversion-of-milliamps-to-amps Impractical 2010-01-04T08:28:02Z 2010-02-09T06:19:51Z

<p>Regarding the conversion of units in physics, when converting milliamps to amps:</p> <p>Is 4.0 mA the same as 0.004A?</p>

http://merspi.com.au/questions/1147/how-do-i-convert-cm3-cubed-to-ml James Spittal 2010-02-06T05:20:21Z 2010-02-06T06:51:02Z

<p>How do I convert cm³ (cubed) to ml?</p>

http://merspi.com.au/questions/742/what-are-the-implications-of-unit-conversion-when-dealing-with-significant-figure Impractical 2010-01-04T23:14:24Z 2010-02-02T11:28:19Z

<p>Occasionally, in answering a question, a textbook chemist may convert his or her answer out of SI units for the final answer.</p> <p>My problem is that this can often mean a very different result in terms of significant figures to my own answer (which I generally keep in SI units no matter how 'unusual' it might be in a particular context.)</p> <p>Is it acceptable for these conversions to be made before the number of significant figures are determined?</p>

http://merspi.com.au/questions/817/calculating-the-molarity-of-ethanol-in-antifreeze Thao 2010-01-09T02:04:46Z 2010-01-23T07:24:28Z

<p>An antifreeze used in a car radiator has an ethanol (C₂H₆O₆) concentration of 20.0% m/m. Given that the density of the solution of 0.968 g mL^-1, calculate the molarity of ethanol in the antifreeze. </p> <p>I don't understand the density part. Thanks.</p>

http://merspi.com.au/questions/1047/finding-the-volume-in-metres-cubed Phresh 2010-01-21T14:34:59Z 2010-01-21T15:08:00Z

<p>One major industrial source of the greenhouse gas carbon dioxide is the heating of limestone, CaCO₃, to produce quicklime, CaO. This reaction is used in a range of industries. The equation for the decomposition of limestone is: CaCO_3(s) &#8594; CaO_(s) + CO_2(g)</p> <p><strong>a)</strong> What mass of quicklime will be produced when 10.0 tonnes of limestone is heated?</p> <ul> <li>1 tonne = 10⁶ g</li> <li>10.0 tonne = 10⁷ g</li> <li>n(CaCO₃) = 99900.0999mol<br /> ...</li> </ul> <p>So I used basic stoichiometry to find out that mass is 5.60 tonnes</p> <p><strong>b)</strong> What volume of carbon dioxide gas at 500 degrees Celsius and 102 kPa will be produced in the process?</p> <p>V=?, T = 500&deg;C = 773K, P = 102kPa</p> <p>V = nRT/P<br /> = 99900.0999 <strong>x</strong> 8.31 <strong>x</strong> 773 / 102<br /> = 6291385.085 L<br /> = 6.29 <strong>x</strong> 10³ m³</p> <p>The answer says 6.29 <strong>x</strong> 10⁴ m³</p> <p>Can someone please confirm this answer?</p> <p>Thanks</p>

http://merspi.com.au/questions/805/is-there-a-unit-conversion-guide-for-vce-chemistry Phresh 2010-01-07T13:11:40Z 2010-01-07T15:48:37Z

<p>Hey,</p> <p>I was wondering if anyone had a link to a website that shows you all the conversions you will encounter in chemistry. For example m³ to L, etc. I'm looking for a rather detailed one so I can use it throughout the year.</p> <p>Thanks</p>

http://merspi.com.au/questions/766/is-kelvin-measured-as-273-2-or-273 Tezza 2010-01-06T07:50:26Z 2010-01-06T14:40:14Z

<p>I'm doing some chemistry revision at the moment at it kills me inside each time the text tells me to measure something one way then they botch it up in the answers.</p> <p>Yeah so I've just gotten used to adding 273.2 everytime Im converting from Celcius to Kelvin. But in the answers they only add 273.</p> <p>Which way is correct [they way examiners accept]</p>