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

Personal leadership mission statement - Ism3004 exam 4 - Gambotto v wcp ltd 1995 - Lord of the flies 1963 movie - Signing naturally 7 12 chegg - Catering service in uttara dhaka - Practical connection paper on cloud computing - Which of the following statements regarding multicountry competition is false - Pfizer inc 2009 case study analysis - Stolen jane harrison scenes - Hot gravity filtration stemless funnel - St matthew from the gospel book of charlemagne - Managerial Accounting: PA2 - Igcse travel and tourism revision notes - Chateau margaux launching the third wine case analysis - Discussion Questions (Need 7 hours) - Discussion question 6 in-cite text - William carlos williams to waken an old lady - Christine ewing is a licensed cpa - Far West Discussion - José y paco / llamar / una vez por semana (imperfecto) - It includes things such as decorative clothing exotic foods etc - Williams refrigeration spares uk - Marketplace simulation tips - Art discussion - InfoTech in a Global Economy -research paper - King's theory of goal attainment in practice - Who published they say i say - African child chapter by chapter summary - Forms of energy quiz - Recrystallization of benzoic acid theory - How big is 400 square inches - Dbmv to dbm calculator - Mackillop family services wollongong - Outline for communication class - Mcdonalds french fries case - Types of redox titration - Community - Carine senior high school map - Chapter 2 ancient egypt study guide answers - The following balances were taken from the books of alonzo corp. on december 31, 2017. - Week2 - Information systems infrastructure evolution and trends - Failing health that results from a long standing dietary intake - Recruitment request form doc - Apigee proxy endpoint vs target endpoint - Sop for business management diploma in canada - A question of food safety level 2 answers - Housing in pompeii and herculaneum - Are seventh day adventists the same as jehovah witnesses - Records are anything papers memos presentations reports books maps emails - Some lessons from the assembly line audience - Barnaby bear visits edinburgh castle - Global Healthcare Comparison Matrix and Narrative Statement - Amur leopard cubs facts - Origin of nursery rhymes - Caltex unleaded petrol sds - El jefe loans raymondville tx - Case Study - Form 9 entry notice - At 180 antenna tuner - According to the international fisher effect - Assume that the real risk free rate is 2 - Old testament seminary manual - Grignard synthesis of 2 methyl 2 hexanol - Metric space questions and answers - The mask you live in summary essay - Ex duris gloria tattoo - Millivolt gas valve diagram - Edinburgh handedness inventory download - Project Mgmt - Reflection, Discussion and Assignment - Disney's design case study answers - I need 500 words in my coca cola company for impact in industry structure - Bpo projects in bangalore - Juvenile crime statistics paper cja 374 - Huyduc than sam set tv - Managerial Economics Assignment - Cat 226 skid steer specs - Which of the following controls leads to standardized behavior and standardized work outputs? - Roye kennel uses tenant days as its measure of activity - Compared to a public warehouse a private warehouse - English Composition I - Sun ancon chi machine - Sacred mexican kitchen mernda - Thesis statement about the importance of friendship - Grading cup to disc ratio - Jcpenney store business improvement plan 2012 - 6.02 x10 23 calculator - Retail price calculator visual basic - Human observation project ideas - Wk 5, HCS 430: Accountability and Liability for Individuals and Organizations - Cochlear online store australia - What element has 18 protons - 01.06 macbeth character development - Nichole marie strazinsky cause of death - Rubric for evaluating children's books - Electric field created by a point charge - Facts about cheapest reliable essay writing service - As 1940 audit checklist - Provision for annual leave journal entry