New User Special Price Expires in

Let's log you in.

Sign in with Facebook


Don't have a StudySoup account? Create one here!


Create a StudySoup account

Be part of our community, it's free to join!

Sign up with Facebook


Create your account
By creating an account you agree to StudySoup's terms and conditions and privacy policy

Already have a StudySoup account? Login here

Capter 2: Units, Accuracy, Precision, Moles

by: Rebecca de la O

Capter 2: Units, Accuracy, Precision, Moles CH 101

Marketplace > University of Alabama - Tuscaloosa > CH 101 > Capter 2 Units Accuracy Precision Moles
Rebecca de la O
View Full Document for 0 Karma

View Full Document


Unlock These Notes for FREE

Enter your email below and we will instantly email you these Notes for General Chemistry

(Limited time offer)

Unlock Notes

Already have a StudySoup account? Login here

Unlock FREE Class Notes

Enter your email below to receive General Chemistry notes

Everyone needs better class notes. Enter your email and we will send you notes for this class for free.

Unlock FREE notes

About this Document

SI Units Conversion Density Accuracy & Precision Moles
General Chemistry
Jared Allred
Class Notes




Popular in General Chemistry

Popular in Department

This 3 page Class Notes was uploaded by Rebecca de la O on Wednesday September 7, 2016. The Class Notes belongs to CH 101 at University of Alabama - Tuscaloosa taught by Jared Allred in Fall 2016. Since its upload, it has received 26 views.


Reviews for Capter 2: Units, Accuracy, Precision, Moles


Report this Material


What is Karma?


Karma is the currency of StudySoup.

You can buy or earn more Karma at anytime and redeem it for class notes, study guides, flashcards, and more!

Date Created: 09/07/16
Chapter 2: Units, Accuracy, Precision, Moles Significant Figures - All nonzero digits are significant (23 = 2 sf) - Zeroes between two non-zero digits are significant (503 = 3 sf) - Leading zeroes are not significant (0.0012 = 2 sf) - Trailing zeroes after or before a decimal point (but after a nonzero number) are significant (140.00 = 3 sf) - Trailing zeroes before an implied decimal should be avoided using scientific 3 notation (1200  1.2 x 10 = 2 sf) - In calculations, the answer should be correct to the same number as that with the fewest decimal places (12.054 x 0.53 = 6.7208  6.7) SI Units Length meter m Weight kilogram kg Time second s BASE SI UNITS Temperature Kelvin K Amount of mole Mol substance Electric ampere A Current Luminosity candela cd DERIVED SI Energy Joules J UNIT Prefixes Tera T 10 12 Giga G 109 6 Mega M 103 Kilo K 10 Milli m 10-3 Micro µ 10-6 -9 Nano n 10 Centi c 10-2 Ex. 1 km  1x 10 m 3 4 10 km  10 x 10  1 x 10 Ex. Convert speed of light to km/s 8 3.0 x 10 m/s -3 1000 m = 1 km  1 m = 10 km 3.0 x 10 x 10 = 3.0 x 10 km/s Math with Different Units Addition: 3.0000 m + 1.00 in = ? 1 inch = 2.54 cm  0.01 (m) x 2.54 = 0.0254 m 3.0000 + 0.0254 = 3.0254 m Multiplication: 15 minutes x 10 Hertz = ? 150 Hz/m 1 Hz = 1/s 150min 150 x60s -1 m xs  m xs = 9000 m Be Careful with exponents!!!!!! 1 mL = 1 cm = 1 cm x 1 cm x 1 cm 1 cm = (1 x 10 m) = 10 m -6 3 Energy: A Fundamental Part of Physical & Chemical Change - Energy is the capacity to do work (comes into play when there are forces) - Work is the action of a force through a distance - Energy is a relative value defined by the state something is in Ex. Gravity pulls on things. When a ball falls and that force occurs over a distance, work is done. - Systems with high potential energy tend to change in the direction of lower potential energy, which releases energy in the surroundings - Higher potential = higher energy - Energy can enter or leave a system but it can never be created, nor destroyed - Exothermic = energy is released from a system to its surroundings - Endothermic = energy is brought into a system from its surroundings - Change in energy = final energy minus initial energy ∆E = E -E f i Ex. Start: 3 J Finish: 5 J ∆E= 5 J – 3 J = 2 J - ∆E > 0 (positive change) means energy is entering the system ∆E < 0 (negative change) means energy is leaving the system - Kinetic energy is associated with the motion of an object - Potential energy is associated with the position or composition of an object - Thermal energy is associated with the temperature of an object Moles - 1 mole = Avogadro’s number = 6.02214 x 10 of whatever you are measuring - A sample of an element with a mass that equals its atomic mass has 1 mole of that element Ex. 28Ni 58.69 amu (atomic mass unit) = 58.69 g/mol (grams per 58.69 mol) of Ni ½ mol = 0.5000 mol x 58.69 g / mol = 29.34 g - Ex. How many people equal the weight of the earth in moles? 24 Person weighs= 75 kg 22 Earth weighs = 6.0 x 10 kg 6.0x10 24 8x10 people = 23 = 0.13 mol 75 6.022x10 people/mol - Ex. How many atoms in 10 mg of Te? 10 mg  0.01000 g 1mol -5 0.01000 g Te x 127.6g = 7.837 x 10 mol 23 -5 6.022x10 atoms 19 7.837 x 10 mol x 1mol = 4.719 x 10 atoms of Te Density - Density = mass/ volume - Density is independent of the amount of the substance


Buy Material

Are you sure you want to buy this material for

0 Karma

Buy Material

BOOM! Enjoy Your Free Notes!

We've added these Notes to your profile, click here to view them now.


You're already Subscribed!

Looks like you've already subscribed to StudySoup, you won't need to purchase another subscription to get this material. To access this material simply click 'View Full Document'

Why people love StudySoup

Steve Martinelli UC Los Angeles

"There's no way I would have passed my Organic Chemistry class this semester without the notes and study guides I got from StudySoup."

Allison Fischer University of Alabama

"I signed up to be an Elite Notetaker with 2 of my sorority sisters this semester. We just posted our notes weekly and were each making over $600 per month. I LOVE StudySoup!"

Steve Martinelli UC Los Angeles

"There's no way I would have passed my Organic Chemistry class this semester without the notes and study guides I got from StudySoup."

Parker Thompson 500 Startups

"It's a great way for students to improve their educational experience and it seemed like a product that everybody wants, so all the people participating are winning."

Become an Elite Notetaker and start selling your notes online!

Refund Policy


All subscriptions to StudySoup are paid in full at the time of subscribing. To change your credit card information or to cancel your subscription, go to "Edit Settings". All credit card information will be available there. If you should decide to cancel your subscription, it will continue to be valid until the next payment period, as all payments for the current period were made in advance. For special circumstances, please email


StudySoup has more than 1 million course-specific study resources to help students study smarter. If you’re having trouble finding what you’re looking for, our customer support team can help you find what you need! Feel free to contact them here:

Recurring Subscriptions: If you have canceled your recurring subscription on the day of renewal and have not downloaded any documents, you may request a refund by submitting an email to

Satisfaction Guarantee: If you’re not satisfied with your subscription, you can contact us for further help. Contact must be made within 3 business days of your subscription purchase and your refund request will be subject for review.

Please Note: Refunds can never be provided more than 30 days after the initial purchase date regardless of your activity on the site.