Log in
Chemistry
2
answers
0
watching
438
views

I am having a hard time with significant figures. Can someone please explain the rules to me. I have an overall understanding but if i have a problem where I am taking 3.52ft x 5312ft, how many sig figs should I keep. I know when multiplying or dividing you always keep the lowest number of sig figs. However my answer is 18698.2 and only three sig figs would change the answer. Can someone please help me understand!

Watch
2
answers
0
watching
438
views

For unlimited access to Homework Help, a Homework+ subscription is required.

Unlock all answers

Get 1 free homework help answer.
Already have an account? Log in
Share
Nestor Rutherford
Nestor RutherfordLv2
28 Sep 2019
Already have an account? Log in
Share
discord banner image
Join us on Discord
Chemistry Study Group
Join now

Related textbook solutions

Basic Chemistry
5 Edition,
Timberlake
ISBN: 9780134138046
Principles of Chemistry Molecular Approach
4th Edition,
Tro
ISBN: 9780134112831
Principles of Chemistry Molecular Approach
3rd Edition, 2014
Tro
ISBN: 9780321971944
Chemistry: Structure and Properties
2nd Edition,
Tro
ISBN: 9780134293936
Chemistry: A Molecular Approach
3rd Edition,
Tro
ISBN: 9780321809247
Chemistry: A Molecular Approach
5th Edition,
Tro
ISBN: 9780134874371
Principles of Chemistry: A Molecular Approach
4th Edition,
Tro
ISBN: 9780134895741
Chemistry: The Central Science
14th Edition, 2017
Brown
ISBN: 9780134414232

Related questions

This is for an organic chemistry lab.

I am writing my lab procedures up, and I ran into something thatstumped me. We are performing solvent extraction at this point, andI am having a hard time understanding how to determine which layerwill be which.. The reaction will start with adding 1ml of1-chlorobutane (density = .8857g/ml) with.32 ml of sulfurylchloride (density = 1.665g/ml). We will then heat/reflux thereaction for 20 mins to perform radical chlorination. We will thenadd 1 ml of DI water (density 1g/ml) to the reaction tube. Usuallywhen I have to choose which layer is which, I just look at thedensities. But in this situation, there are 2 initial liquidreactants with different densities, and to make it more confusingone density is lower than water, and one is higher than water. So,I am confused as to the best method to predict which layer will bemy aqueous layer. If someone can help me with this, I wouldappreciate it. If the answer involves a calculation, please outlinethe calculation for me so I can learn and not just get the answer.I would like to be able to understand this for the future. Thanks!

Good Afternoon,

I am doing a laboratory report for the course entitled: Principles of Instrumental Analysis. It is a 4th year course and i have been tasked with the following analytical problem, "Determine the DEET composition in common bug sprays." In other words, I have to determine the concentration of DEET in a couple of bug sprays. The sprays and DEET are supplied. Secondly, I have to prepare a protocol for measuring the concentration of DEET in my samples and a GC:MS method for analysis of DEET. By the way, GC:MS is short for 'Gas chromatography–mass spectrometry' and as you may know it is an analytical method that combines the features of gas-chromatography and mass spectrometry to identify different substances within a test sample. Basically, I need your help in giving me a layed-out protocol (such as we would see in a manual) of what I will do in the lab to answer the above analytical problem. You can think of it as a lab manual that you would write so that someone else could go in the lab and perform the experiment in your place.

It should have all of these components.

1. Brief (!) introduction of the problem (1 short paragraph)

2. Sampling – how much (be precise), in what form, how many, where, etc.

3. Sample preparation – list all reagents needed up front. Then list all steps and procedures you will use to prepare the samples for instrumental analysis. You should know what concentration ranges you are aiming for.

4. Standards preparation – list steps involved in preparing your standards used for calibration (if you need to do this).

5. Instrumental Analysis – list the procedure for running the instrument, including any blanks, standards. The sequence of runs (sample, standard, blank, etc) should be listed.

6. Data Analysis – how will you go from the raw data provided by the instrument to a value with a ± deviation on it.

Please refer to the above question. Can you give me a detailed layout of how I will determine the concentration of DEET in my samples before doing the GC:MS analysis? You do not need to determine the composition or synthesize DEET. You need to determine the concentration of DEET, in a couple of bug sprays. The sprays and DEET are supplied.

I'm not quite understanding. Thank you for your clarification once again.

Weekly leaderboard

Home
Homework Help 3,900,000
Chemistry 830,000
Start filling in the gaps now
Log in