SI Units

[Margaret Akey]

What do we need to know about SI Units for our first test?

[404905747]

There is a section (F6) in the book that goes over SI units and I found that helpful. Not sure exactly what we need to know but the book was a good refresher.

[taline_n]

Today in lecture we learned the SI units for: mass (kg), length (m), time (s), volume (m³), density (kg/m³), and the prefixes specific to those units. Since our first test is a only a review of high school chemistry, these should be all we need to know! I hope this helps :)

[Julia Jones 1G]

For the test will we be expected to know the various SI unit prefixes and their meaning?

[Rachana Jayaraman 1H]

Yes, but he said the most useful ones for the class will be:
k kilo 10^3
c centi 10^-2
m milli 10^-3
and
A (Angstrom), which is 10^-10 and is used for bond lengths, but is not a SI unit.

[pauline_le_3I]

Speaking of the test, does anyone know when the test is going to be?

[mahika_nayak_3L]

The first test is going to take place starting Tuesday October 9 in your given discussion section. It will cover all of the review material from the lectures thus far and include homework concepts as well!

[Carissa Young 1K]

Here is some we have to know: Mass (kg) Length(m) Time(s)
Giga - 10^9
mega- 10^6
kilo - 10^3
deci- 10^-1
centi- 10^-2
milli- 10^-3
micro- 10^-6
nano- 10^-9
pico-10^-12

We went over these in lecture; hope that this list is helpful

[Ricardo Martin 1J]

Do all our final answers need to be converted to the base SI unit (ex:meter, kilogram, mole) or do we just use the closest prefix to it? And if we leave our answer in the base SI unit and do not use a prefix simplifying the value would our answer be wrong even if both answers would be mathematically equivalent?

[Carissa Young 1K]

Do all our final answers need to be converted to the base SI unit (ex:meter, kilogram, mole) or do we just use the closest prefix to it? And if we leave our answer in the base SI unit and do not use a prefix simplifying the value would our answer be wrong even if both answers would be mathematically equivalent?

usually, the problem will say what units the answer should be in; if not then I assume you use the base SI unit.

[Sara Flynn 2C]

Do all our final answers need to be converted to the base SI unit (ex:meter, kilogram, mole) or do we just use the closest prefix to it? And if we leave our answer in the base SI unit and do not use a prefix simplifying the value would our answer be wrong even if both answers would be mathematically equivalent?

I believe that Lavelle said that as long as the answer is equivalent then he will accept the answer (if the problem does not ask for a specific unit)