Loading...

Messages

Proposals

Stuck in your homework and missing deadline? Get urgent help in $10/Page with 24 hours deadline

Get Urgent Writing Help In Your Essays, Assignments, Homeworks, Dissertation, Thesis Or Coursework & Achieve A+ Grades.

Privacy Guaranteed - 100% Plagiarism Free Writing - Free Turnitin Report - Professional And Experienced Writers - 24/7 Online Support

Chemical formulas pre lab questions

02/04/2021 Client: muhammad11 Deadline: 2 Day

I need support with this Chemistry question so I can learn better.

- Please make sure you answers the questions CORRECTLY

- The pre-lab questions are located at the end of the document

- please recheck your work, to make sure questions are answered correctlyCHEM 403 Exp 5 Experiment 5: DETERMINATION OF AN UNKNOWN CHEMICAL FORMULA* When atoms of one element combine with those of another, the combining ratio is typically an integer or a simple fraction; 1:2, 1:1, 2:1, and 2:3 are ratios one might encounter. The simplest formula of a compound expresses that atom ratio. Some substances with the ratios listed include CaCl2, KBr, Ag2O, and Fe2O3. When more than two elements are present in a compound, the formula still indicates the atom ratio. Thus the substance with the formula Na2SO4 indicates that the sodium, sulfur, and oxygen atoms occur in that compound in the ratio 2:1:4. Many compounds have more complex formulas than those noted here, but the same principles apply. To determine the formula of a compound, one needs to find the mass of each of the elements in a weighed sample of that compound. For example, if you resolved a sample of the compound NaOH weighing 40 grams into its elements, you would obtain approximately 23 grams of sodium, 16 grams of oxygen, and 1 gram of hydrogen. Since sodium atoms have a relative mass of 23, oxygen atoms a relative mass of 16, and hydrogen atoms a relative mass of 1, you could conclude that the sample of NaOH contained equal numbers of Na, O, and H atoms. Since that is the case, the atom ratio Na:O:H is 1:1:1, and so the simplest formula is NaOH. In terms of moles, one mole of NaOH contains one mole of Na, one mole of O, and one mole of H. In this experiment, you will use these principles to find the formula of a compound called copper chloride hydrate, with the general formula CuxCly∙zH2O, where the x, y, and z are integers which, when known, establish the formula of the compound. (In expressing the formula of a compound like this one, where water molecules remain intact within the compound, the formula of H2O is retained in the formula of the compound.) This compound has a characteristic blue-green color which changes to tan or brown when the water is slowly removed by heating. The compound formed is anhydrous (no water) copper chloride. By subtracting its mass from that of the hydrate, you can determine the mass of the water that was driven off, and, using the molar mass of water, find the number of moles of H2O that were in the sample. In the next step, you will need to find either the mass of copper or the mass of chlorine in the anhydrous sample. It turns out to be much easier to determine the mass of the copper, and find the mass of chlorine by difference. This is achieved by dissolving the anhydrous sample in water, which gives a green solution containing copper and chloride ions. To that solution, an aluminum nail is added. In contact with a solution containing copper ions, the aluminum metal will react chemically with those ions, converting them to copper metal. The aluminum is said to reduce the copper ions to the metal, and is itself oxidized. The copper metal appears on the nail as the reaction proceeds, and has a red-orange color. When the reaction is complete, the copper can be separated and collected from the solution and weighed. From its mass, you can calculate the number of moles of copper in the sample. You can then find the mass of chlorine by subtracting the mass of copper from that of the anhydrous copper chloride, and from that value determine the number of moles of chlorine. The mole ratio for Cu:Cl:H2O will give you the formula of the compound. *Adapted from Slowinski, E. J., Wolsey, W. C. Chemical Principles in the Laboratory 9th ed. CHEM 403 Exp 5 Procedure Weigh a clean, dry crucible, and record its mass. Place about 1 gram of the unknown hydrated copper chloride in the crucible and record the total mass of the sample with the crucible. With your spatula, break up any sizeable crystal particles by pressing them against the wall of the crucible. Place the uncovered crucible on a clay triangle supported by an iron ring.

Homework is Completed By:

Writer Writer Name Amount Client Comments & Rating
Instant Homework Helper

ONLINE

Instant Homework Helper

$36

She helped me in last minute in a very reasonable price. She is a lifesaver, I got A+ grade in my homework, I will surely hire her again for my next assignments, Thumbs Up!

Order & Get This Solution Within 3 Hours in $25/Page

Custom Original Solution And Get A+ Grades

  • 100% Plagiarism Free
  • Proper APA/MLA/Harvard Referencing
  • Delivery in 3 Hours After Placing Order
  • Free Turnitin Report
  • Unlimited Revisions
  • Privacy Guaranteed

Order & Get This Solution Within 6 Hours in $20/Page

Custom Original Solution And Get A+ Grades

  • 100% Plagiarism Free
  • Proper APA/MLA/Harvard Referencing
  • Delivery in 6 Hours After Placing Order
  • Free Turnitin Report
  • Unlimited Revisions
  • Privacy Guaranteed

Order & Get This Solution Within 12 Hours in $15/Page

Custom Original Solution And Get A+ Grades

  • 100% Plagiarism Free
  • Proper APA/MLA/Harvard Referencing
  • Delivery in 12 Hours After Placing Order
  • Free Turnitin Report
  • Unlimited Revisions
  • Privacy Guaranteed

6 writers have sent their proposals to do this homework:

Write My Coursework
Solutions Store
Engineering Guru
Smart Homework Helper
Homework Guru
Top Writing Guru
Writer Writer Name Offer Chat
Write My Coursework

ONLINE

Write My Coursework

Hello, I an ranked top 10 freelancers in academic and contents writing. I can write and updated your personal statement with great quality and free of plagiarism

$20 Chat With Writer
Solutions Store

ONLINE

Solutions Store

I am known as Unrivaled Quality, Written to Standard, providing Plagiarism-free woork, and Always on Time

$20 Chat With Writer
Engineering Guru

ONLINE

Engineering Guru

I have read and understood all your initial requirements, and I am very professional in this task.

$39 Chat With Writer
Smart Homework Helper

ONLINE

Smart Homework Helper

I will cover all the points which you have mentioned in your project details.

$38 Chat With Writer
Homework Guru

ONLINE

Homework Guru

I have read and understood all your initial requirements, and I am very professional in this task.

$34 Chat With Writer
Top Writing Guru

ONLINE

Top Writing Guru

I am known as Unrivaled Quality, Written to Standard, providing Plagiarism-free woork, and Always on Time

$34 Chat With Writer

Let our expert academic writers to help you in achieving a+ grades in your homework, assignment, quiz or exam.

Similar Homework Questions

Corporate leadership council talent management - Monteverdi orfeo tu se morta - Advantages and disadvantages of computer forensics - Mother to son poem - Case Study on Moral Status - Upper loddon bush camp - Ralph linton the cultural background of personality summary - Bishop tufnell primary school - Hendrickson rubber block suspension parts - Organizational Economics DQ - The effect of scalability on virtualization - Best sounding aes ebu digital cable - Ual unit 8 project proposal - Visual basic questions and answers pdf - Inequalities and square roots - Rock cycle fill in the blank worksheet and answers - Rad advanced foundation port de bras - Research Methods used rhetoric 400 WORDS POST need it in 12 hours - Web server plugin for websphere application server - West coast university admissions office excel formulas - Cultural Diversity - Chern case study chapter 8 - Role development in professional nursing practice 2nd edition - Iso 10474 en 10204 - When you roll doubles in monopoly - Analysis on the Demand of Top Talent Introduction in Big Data and Cloud Computing Field in United States Based on 3-F Method - Disney snow globe maker tesco - Minimum spangle galvanized steel - Pylos combat agate hi res - World map climate zones - Sixth roots of unity - Euclid v ambler case brief - Viscosity of water at 100 degrees celsius - Adult development - Computer networking basics pdf book - Answer two questions After reading the the Love in LA story by Dagoberto Gilb: - Ikea strategic management case study - Activatecard com au tsa - Wk 1, IOP 490: Workplace Assessment – The Whole System - 4.16 repeating as a fraction - Res_inno_4 - On the sidewalk bleeding summary - Diverging lens ray diagram - Time Bomb Case - Your wisdom is consumed in confidence - Why is it desirable to pretest survey instruments - Interactive session management - Individual learning plan sample - Intermediate accounting chapter 23 statement of cash flows solutions - Sustainable planning act 2009 - Who invented modern soccer - Paul keating redfern speech analysis - Talent recruitment at frog design shanghai case analysis - Discussion Board 1 - Week 3 Discussion - Economics in Healthcare Setting - Don't let the pigeon stay up late powerpoint - What is mondelez international's corporate strategy - Mattel recall case study - Homework -Ostds - Ph titration of vinegar lab report - The highest priority and first strategy required for any organizational change is to: - Community DQ2 - Dulux duramax metallic finish - 1260 days in years and months - 257 junction road clayfield - The 7 cs of communication - History exam - Is mixing nacl and agno3 a chemical change - Week 4 discussion - Accuracy and precision worksheet chemistry - Egyptian mummy case template - Why does the crucible have to be cooled before weighing - Car rental management system in java - Stage 5 visual arts programs - The table below describes the smoking habits of a group of asthma sufferers - Live feature on pof - Scientific drawing of a measuring cylinder - Workshop 6 - Sensation and perception assignment - Amazon echo target consumer - CC-8 - Issa sports nutrition case study - Pharma peer replies - Genetics x linked genes answers - X2 2x 120 0 - Fbi collegiate hiring initiative reddit - Rational approach to change management - Shadow health mental health answers - Molar mass of cl2 - Scientific and Mathematical/Analytical Perspectives of Inquiry Paper - Barbie doll by marge piercy theme - If you meet buddha on the road kill him pdf - Coca cola cost leadership - Powerpoint animation shrink to corner - Business case analysis - Course name: Information Governance - How to use chopsticks daily paragraph editing - Vicroads side entry pit - Itil foundation exam questions and answers 2019 pdf - Centre for arab and islamic studies