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

Is slicing bread a chemical or physical change

27/11/2021 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 Rated Expert
Accounting & Finance Specialist
Assignments Hut
Professor Smith
Supreme Essay Writer
Top Academic Guru
Writer Writer Name Offer Chat
Top Rated Expert

ONLINE

Top Rated Expert

I can assist you in plagiarism free writing as I have already done several related projects of writing. I have a master qualification with 5 years’ experience in; Essay Writing, Case Study Writing, Report Writing.

$41 Chat With Writer
Accounting & Finance Specialist

ONLINE

Accounting & Finance Specialist

As per my knowledge I can assist you in writing a perfect Planning, Marketing Research, Business Pitches, Business Proposals, Business Feasibility Reports and Content within your given deadline and budget.

$33 Chat With Writer
Assignments Hut

ONLINE

Assignments Hut

Being a Ph.D. in the Business field, I have been doing academic writing for the past 7 years and have a good command over writing research papers, essay, dissertations and all kinds of academic writing and proofreading.

$25 Chat With Writer
Professor Smith

ONLINE

Professor Smith

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

$25 Chat With Writer
Supreme Essay Writer

ONLINE

Supreme Essay Writer

This project is my strength and I can fulfill your requirements properly within your given deadline. I always give plagiarism-free work to my clients at very competitive prices.

$33 Chat With Writer
Top Academic Guru

ONLINE

Top Academic Guru

As per my knowledge I can assist you in writing a perfect Planning, Marketing Research, Business Pitches, Business Proposals, Business Feasibility Reports and Content within your given deadline and budget.

$50 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

Week 2 Sociological Imagination Essay - Role development for the nurse practitioner 2015 - Everyday use discussion questions answer key - Business requirements report - Cell homeostasis virtual lab answer - Wiemers corporation's comparative balance sheets are presented below - Tennis steps to success - Forbidden caverns reviews - Threaded 5 - Introduction to modern climate change 2nd edition andrew dessler pdf - Call centre shrinkage definition - Classify each of the following financial statement items - X mouse button control - The danger of a single story analysis essay - Sika wetherill park nsw 2164 - 202 stanhill drive chevron island - Income tax folio s2 f3 c2 - From pole to pole planet earth worksheet - Configuration guide for big ip local traffic manager - Dr lavrik lenoir city tn - MGT312T Week. 2 Apply Self-Assessment Reflection - Rosewill rca 220 bl - Air rushes into the lungs of humans during inhalation because - Operations and supply chain management the core 4th edition ebook - All minus one jonathan haidt - Sport marketing 4th edition human kinetics - Analyze State Employment Law - Bennett brooks accountants northwich - Level 1 dfd for food ordering system - 2009 penny with man sitting on log - College Essay - Entire classes work - B write the equation for ohm's law - Gee's "Literacy, Discourse, and Linguistics." - Configure and verify the initial router configuration - How to ask for feedback from your manager example - Training session plan template - A dockworker loading crates on a ship - Grand strategy selection matrix - Is exocytosis active or passive - Guidelines for Writing Your Letter to the Admissions Committee - 2 federal laws that protect employees - Weekly Summary 4 - Tasmanian tiger children's book - Define formed elements and list the major categories - Infrared thermometer best used for servsafe - Business Intelligence - Health Documentary - Acara maths year 3 - Gale force surfing case solution - What are some factors that affect social mobility - 0.96 repeating as a fraction in simplest form - Jaguar plastics company has been operating for three years - RESEARCH METHODS IN DEVELOPMENT PRACTICE - Vocabulary - Institute of business ethics - The pitcher poem by robert francis - The red lotus of chastity summary - Discussion Board for Learning Strategies for Success - Advantages and disadvantages of back titration - Microsoft Power Point Assignments 3 - Driving medical assessment form - Trap karaoke raleigh the ritz december 7 - Dividend policy at linear technology case study solution - Unilever sustainable living plan case study - Major programming error from the last five years - Translational Research And Population Health Management - Mrs brown's art class 5th grade - Asean strategic action plan for sme development 2016 2025 - Arkadin dial in numbers uk - Bose companion 3 instructions - Co education essay css forum - Hrm 300 week 5 trends in hr management analysis - Novalease car salary exchange - Gcu career compass - Chapter 2 the marketing plan worksheet answers - In 2005 omnicom group’s ketchum pr agency received unwanted attention due to what circumstance? - Spiral of silence theory examples in movies - Vodafone and hutch merger case study - The ethnic theory of plane crashes outliers summary - EDUC-6263 - Gainesboro machine tools corporation - Lewis dot diagram for cf4 - Hyperion financial reporting studio - E force bedlam lite 170 stringing instructions - THEORIES OF INQUIRY - Gomez runs a small pottery firm - Why does george stay with lennie in chapter 1 - Food hygiene level 2 answers - Christmas pass the parcel rhyme - Ridge racer ds rom - Walt disney company value chain - Research Questions - Week 9 CL - Comp Crimes & Digital Forensic - Research Paper - Create a scenario summary report accept the recommended results cells - Commercial club membership price - Vitamin b6 in banana - Realidades 1 capitulo 3a prueba 3a 3 answers - Dr aa sheriff st albans