## SI Units

Margaret Akey
Posts: 80
Joined: Fri Sep 28, 2018 12:18 am

### SI Units

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

404905747
Posts: 29
Joined: Fri Sep 28, 2018 12:17 am

### Re: SI Units

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
Posts: 64
Joined: Fri Sep 28, 2018 12:17 am

### Re: SI Units

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
Posts: 29
Joined: Fri Sep 28, 2018 12:16 am

### Re: SI Units

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

Rachana Jayaraman 1H
Posts: 61
Joined: Fri Sep 28, 2018 12:26 am

### Re: SI Units

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
Posts: 21
Joined: Fri Sep 28, 2018 12:25 am

### Re: SI Units

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

mahika_nayak_3L
Posts: 60
Joined: Fri Sep 28, 2018 12:26 am

### Re: SI Units

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
Posts: 65
Joined: Fri Sep 28, 2018 12:17 am

### Re: SI Units

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
Posts: 63
Joined: Fri Sep 28, 2018 12:15 am

### Re: SI Units

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
Posts: 65
Joined: Fri Sep 28, 2018 12:17 am

### Re: SI Units

Ricardo Martin 1G wrote: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
Posts: 60
Joined: Fri Sep 28, 2018 12:23 am

### Re: SI Units

Ricardo Martin 1G wrote: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)