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

Slicing bread physical or chemical change

03/12/2021 Client: muhammad11 Deadline: 2 Day

LAB EXPERIMENT 1

OBSRVATIONS OF CHEMICAL CHANGES

PURPOSE OF EXPERIMENT

The purpose of the experiments were to observe chemical changes on various chemicals. The experiment was to distinguish between burning and heating.

PROCEDURE

A few drops of hydrochloric acid were dropped in a product labelled sodium hydrogen carbonate. Silver nitrate solution was also reacted with aqueous sodium hydroxide solution.

Magnesium metal, zinc metal, copper carbonate and copper nitrate were heated in one experiment separately and then burned.

OBSERVATIONS

When sodium hydrogen carbonate was reacted with hydrochloric acid, there was no color change. However, bubbling and fizzling occurred. The test for starch with IKI indicator resulted in a blue-black color of the solution. Reaction of potassium iodide with lead nitrate solution produced a yellow color. When phenolphthalein indicator was added to a solution of sodium hydroxide, there was a color change to bright pink. The indicator did not result in any color change when it was added to hydrochloric acid.

Reaction of silver nitrate and sodium hydroxide resulted into a light brown, black starches. Silver nitrate reacted with aqueous ammonia, and the observation was a white and cloudy solution formed. When the solution was absorbed into a paper towel and exposed to sunlight, color changed to brown and rusty. When aqueous ammonia was reacted with copper (II) sulphate, a blue solution was formed.

Reactant A

Reactant B

Observation

sodium hydrogen carbonate

hydrochloric acid

No color change

bubbling and fizzling

Starch

IKI indicator

a blue-black color

potassium iodide

lead nitrate solution

yellow color

phenolphthalein indicator

sodium hydroxide

color change to bright pink

phenolphthalein indicator

Hydrochloric acid.

No color change

silver nitrate

sodium hydroxide

light brown, black starches

Silver nitrate

aqueous ammonia

a white and cloudy solution. When the solution was absorbed into a paper towel and exposed to sunlight, color changed to brown and rusty

copper (II) sulphate

aqueous ammonia

blue solution

Magnesium metal was silver and shiny. After heating, it glowed bright red and became a white ash. Zinc metal which is rock-like and silvery melted into liquid after heating. Copper carbonate turned black upon heating while copper (II) nitrate melted and turned green, and lots of fizzing and gas were released, it finally turned black, however.

Substance

Heating

Burning

Magnesium metal

glowed bright red and became a white ash

Glowed red, then turned into a bright white flame, then turned into ash

Zinc metal

melted into liquid

Melted into a liquid, glowed red

Copper carbonate

turned black

The flame glowed blue and the powder turned black

copper (II) nitrate

Melted and turned green, and lots of fizzing and gas were released, it finally turned black, however.

The flame glowed green, and the crystals bubbled and turned black

LAB ANSWERS

Exercise 1.

1. In order to test whether a lab product contained sodium hydrogen carbonate, a few drops of hydrochloric acid would be added. If there is fizzing and bubbling of a gas, the household product is then sodium hydrogen carbonate.

2. The chemical equation for reaction between silver nitrate and sodium hydroxide is:

3. The reaction which produced the products was the one between hydrochloric acid and sodium hydrogen carbonate. There was fizzing and bubbling of gas due to production of

4. Since the sample with a faint odor turned pink, I would say that it is sodium hydroxide. Vinegar is made up to acetic acid, and phenolphthalein doesn’t cause a color change in acids.

5. The fifth cookie brand which gives a yellow-brown color does not have as much starch as compared to the other brands.

6. In order to confirm presence or absence of lead, some drops of the hair tonic would be dropped into some potassium iodide. If the solution is yellow, then there is some lead in the hair tonic.

7. Cutting a cake into 8 pieces is a physical change. This is because no new substance is formed.

8. When soda is poured into glass and the soda bubbles, it is a result of chemical change. This is because a gas is released, meaning that a certain substance in the soda has transformed.

9. In well B1, specifically in the second step, the reactant was direct sunlight. This is a chemical reaction because it turned color of dark brown similar to rust on the paper towel meaning a new substance was formed.

10. Phenolphthalein acts well as an acid/base indicator. The observation in A5 do support this statement. This is because HCl doesn’t change whereas the base turns to pink.

Exercise 2

1. The similarities of burning and heating magnesium are that there was a chemical change, resulting in the metal burning and producing ash. The difference is that when burned, magnesium burst into a bright white light while heating it made it to glow red and turn into ashes.

2. There were no differences observed in heating and burning of zinc metal. There was chemical change in burning since it only melted into a liquid.

3. Heating copper carbonate turned the powder into black and a powder was released. Burning it also resulted into formation of a black substance. There was a chemical change in both heating and burning.

4. Heating and burning copper nitrate was exactly the same. However, a glowing flame was absent when heating. There was a chemical change in burning.

5. The differences between heating and burning are that heating adds thermal energy while burning is a chemical reaction called oxidation.

6. Chemical producing a physical change was mossy zinc (it melted into liquid.

CONCLUSIONS

When two chemicals react, a product is formed and the two chemicals are said to have undergone a chemical change. This is because they have been transformed. Physical change only involves change of state. Chemicals react differently to both heating and burning. More differences are observed when heating the chemicals, however.

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:

Top Writing Guru
Assignment Hub
Top Academic Guru
Financial Hub
High Quality Assignments
Financial Analyst
Writer Writer Name Offer Chat
Top Writing Guru

ONLINE

Top Writing Guru

I have read your project description carefully and you will get plagiarism free writing according to your requirements. Thank You

$48 Chat With Writer
Assignment Hub

ONLINE

Assignment Hub

I find your project quite stimulating and related to my profession. I can surely contribute you with your project.

$34 Chat With Writer
Top Academic Guru

ONLINE

Top Academic Guru

I have worked on wide variety of research papers including; Analytical research paper, Argumentative research paper, Interpretative research, experimental research etc.

$19 Chat With Writer
Financial Hub

ONLINE

Financial Hub

I have written research reports, assignments, thesis, research proposals, and dissertations for different level students and on different subjects.

$34 Chat With Writer
High Quality Assignments

ONLINE

High Quality Assignments

As an experienced writer, I have extensive experience in business writing, report writing, business profile writing, writing business reports and business plans for my clients.

$44 Chat With Writer
Financial Analyst

ONLINE

Financial Analyst

I am an elite class writer with more than 6 years of experience as an academic writer. I will provide you the 100 percent original and plagiarism-free content.

$43 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

SQL DATABASE - What biome is nashville tennessee - 68 odd or even - INCREASING VOTER TURNOUT/POL2076 WEEK 4 DISCUSSION - Build a castle project - Atticus said the bravest person he ever knew was - Minifie park childcare centre - Resolvedd strategy - What research method was used in the milgram experiment - 11903 alief clodine suite 100 rd houston tx 77082 - Boeing 737 take off procedures - Understanding and Applying Management of Sport Facilities - What is component based software engineering - Wall street journal classroom edition unit 3 debate minimum wage - Big data analytics is usually associated with blank services - Up the coolly keystone answers - Answers to pbi interview questions - Effective Speaking Discussion - How to make a cross section in google earth - Features of a dystopia - Cascading of circuit breakers - Cisco ios security command reference - Diffusion coefficient of ferrocene in acetonitrile - Hindsight bias ap psychology - Case Example - A Colleague of Concern - Rule of nines child - Bega valley private hospital - The palace thief summary - Testout client pro 5.1 0 answers - Article Critique Paper - Gcse business studies market research - All changed changed utterly a terrible beauty is born - Griffith college assignment cover sheet - Business Intellegence - Lms aeromexico core login index - Moira macs shredded chicken woolworths - Anton paar mcr 702 - OT- Journal Analysis 6 - Mrs smith psychology - Essay Outline - Merrill lynch boa merger - The wound spring of a clock possesses - Cherie lunghi nescafe - Convert nmol l to ng ml - Sirius xm case study - Midsummer night's dream storyboard - Bairds pharmacy king street - Whirlpool case study answers hrm - Roman crime and punishment - Song of myself questions and answers - Motel receptionist job description - Hpe 3par 9000 quickspecs - Forgiving the unforgivable sherry johnson pdf - Auto configuration server tr 069 - Any old bag speech ideas - Art Project ONE - Questions on christmas carol with answers - CIS 275 - Experiment 1 observation of mitosis in a plant cell - Dwight grabs jim's junk bloopers - Test developnent ADHD - Books for year 8 students - Center of mass of a semicircular ring - Writing an observation report of a child - Project management for business engineering and technology 5th edition pdf - Deming application prize model - Fir sauna dome benefits - Te tahuhu o te matauranga - Footprint on your heart by gary lenhart analysis - Characteristics of byzantine paintings - Response to intervention case study - Gold coast council town planning - A nurse practice scholar must locate credible evidence to address nursing practice problems. Conduct a brief literature search and select a source of evidence to address a practice problem at your workplace. - Custom molds inc case study answers - Life science 2004 creative teaching press kingdom plantae - Target ignored data breach alarms - Adobe lightroom serial number location - Interpreting Political Ads - Air enters an evaporative cooler at atm - Journalize the april transactions using a periodic inventory system - Unit of astronomical distance - Managerial economics - Alexander's ragtime band youtube - Kal so4 2 name - Bending moment in a beam lab report - Developing a health advocacy campaign walden - What is the difference between linear regression and logistic regression - Comp8 - Child family and community textbook - The shimabara rebellion catholic tragedy buddhist triumph - Drinking coffee elsewhere doris is coming summary - Pre registration exam papers - 5 hanslow way taylors lakes - Data Mining Questions - Who is julia in my sister's keeper - Tasmanian family history society - Individual database design and erd creation - Potassium hydrogen phthalate hazards - Nokia market segmentation targeting and positioning - Use Cases