Do we need to memorize unit conversions?  [ENDORSED]

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004338125
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Joined: Fri Sep 20, 2013 3:00 am

Do we need to memorize unit conversions?

Postby 004338125 » Wed Oct 16, 2013 12:58 am

Do we need to memorize the unit conversions?

For example:

nm = x10^-9m
pm = x10^-12m

Chem_Mod
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Re: Do we need to memorize unit conversions?  [ENDORSED]

Postby Chem_Mod » Wed Oct 16, 2013 7:01 am

Yes. You should have such unit conversions memorized.

For example, on a quiz you may be given the size of an object in nanometers. You must know how to convert this to the SI base unit meter for use in formulas (1 m = 10-9 nm).

Here is the list of commonly used metric prefixes:
  • mega (M) : 106
  • kilo (k) : 103
  • hecto (h) : 102
  • deca (da) : 101
  • deci (d) : 10-1
  • centi (c) : 10-2
  • milli (m) : 10-3
  • micro (μ) : 10-6
  • nano (n) : 10-9

tinaZ
Posts: 6
Joined: Fri Sep 25, 2015 3:00 am

Re: Do we need to memorize unit conversions?

Postby tinaZ » Fri Oct 02, 2015 3:29 pm

For metric to metric unit conversions, yes, but for metric to US (i.g. meters to inches or mL to pints) you don't have to memorize.
also, 1cm^3=1mL

504549031
Posts: 17
Joined: Fri Sep 25, 2015 3:00 am

Re: Do we need to memorize unit conversions?

Postby 504549031 » Sat Oct 03, 2015 11:34 pm

What other unit conversions must be memorized for the exams in Chem 14A?

skalvakota2H
Posts: 52
Joined: Sat Jul 22, 2017 3:01 am

Re: Do we need to memorize unit conversions?

Postby skalvakota2H » Tue Oct 03, 2017 9:48 pm

Other conversions that may prove useful include:
1000mL = 1L, for volume analysis
1000 g = 1kg for mass analysis

Knowing the difference will make converting units easier when doing dimensional analysis.

Robert Estrada
Posts: 50
Joined: Fri Sep 29, 2017 7:05 am

Re: Do we need to memorize unit conversions?

Postby Robert Estrada » Thu Oct 05, 2017 1:52 pm

Should we also have the 3 temperature conversions memorized?

Sophie 1I
Posts: 51
Joined: Fri Sep 29, 2017 7:04 am

Re: Do we need to memorize unit conversions?

Postby Sophie 1I » Thu Oct 05, 2017 9:35 pm

Some temperature conversions that are good to know:
When going from Celsius to Kelvin you add 273.15 to the temperature in Celsius (and subtract 273.15 going from kelvin to celsius)
Celsius= (Fahrenheit-32)x(5/9)

Lianna Kishi 1A
Posts: 23
Joined: Thu Jul 27, 2017 3:00 am

Re: Do we need to memorize unit conversions?

Postby Lianna Kishi 1A » Fri Oct 06, 2017 6:45 pm

Is there any easy way to remember metric prefixes? For example, a mnemonic that would help me remember what each one corresponds to or the order of them? Thanks!

Michelle Pham_3H
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Joined: Fri Sep 29, 2017 7:07 am

Re: Do we need to memorize unit conversions?

Postby Michelle Pham_3H » Fri Oct 06, 2017 7:33 pm

One way that I remember metric prefixes is kind of antiquated and silly, but I learned it in middle school and I still use it now. It's an acronym called "King Henry Dances Up Down Chocolate Mountain", and it gives you the order of the metric prefixes from largest to smallest (kilo-, hecto-, deka-, etc). So what I normally do is I write the first letters down on paper (k h d u d c m) and you can use this to convert between the different prefixes. For example, if you have 3 grams and you need to convert it to milligrams, m is three milligrams to the right of u. That means you would move the decimal place 3 times to the right and you'd have 3,000 mg.

Dennisse Diaz 1D
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Re: Do we need to memorize unit conversions?

Postby Dennisse Diaz 1D » Sun Apr 15, 2018 9:35 pm

Does anyone know any helpful ways to memorize these conversions?


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