A Study of the Vinegar Fermentation1 March 18‚ 2013 -------------------------------- 1 A scientific paper submitted in partial fulfillment of the requirements in HNF 12 laboratory‚ 2nd sem.‚ 2012-2013. OBJECTIVES 1. To enumerate the principle and methods in fermentation; and 2. to identify the factors that affect the efficiency of fermentation. INTRODUCTION Vinegar has been traditionally used as a food preservative. Vinegar retards microbial growth and
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Pennies gets dirty at times whenever people take them out of their pockets to pay for something. Pennies are exposed to air and lose their shine really quickly. They collect dust‚ dirt and gunk. Most people‚ without paying attention‚ drops their pennies on the floor and become rusty over time. The reason for this is the air and other things that come into contact with this penny. A cleaning solution can be described in chemical formula of Acetic acid‚ a colorless organic compound‚ which has a pH
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not to use acetic acid-based descaler (vinegar)‚ as this could have a negative effect on the taste of the coffee. Note: Never use a vinegar-based descaling agent with 8% or more acetic acid to descale the appliance‚ as this may cause damage. (2) citric acid is used mainly for home use‚ for getting rid of lime scale‚(kettles‚ baths‚ toilets)‚ in hard water areas.It is a natural material (found in fruit)‚ and is non toxic‚ and doesn’t smell like vinegar would if you used that.By the way‚ I’ve
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“Pineapple peelings as vinegar” “Pineapple peelings as vinegar” *Abstract*- The pineapple ( Ananas comosus) is a tropical plant and fruit (multiple)‚ nativeto Uruguay‚ Brazil‚ and Paraguay. It is a medium tall (1±1.5m) Herbaceous perennialplant with 30 or more trough-shaped and pointed leaves 30±100 cm long‚ surrounding at hick stem. The pineapple is an example of a multiple fruit: multiple‚ spirally-arranged flowers along the axis each produce a fleshy fruit that becomes pressed against the
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IB Chemistry Experiment 4 Composition of a Post-1983 Penny Lab Report Background: Through the use of percent composition one can easily find out how much of a certain element is in a compound or an item such as a post-1983 penny. The experiment will be using HCl a strong acid to dissolve all the zinc inside the outer copper shell. The reaction follows as such; Zn+2HCLZnCl2+H2‚ but there will be no reaction with copper. The portion that will be measured is the mass of copper left after all of
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the U.S should stop making pennies. Pennies just cost to much to make‚ and they waste our time counting them over counters and at food service windows. Also‚ other countries have banned the penny and so should we. The penny costs more than its worth. Even though‚ pennies aren’t worth that much‚ the money wasted to produce them can add up to millions of dollars over time. It costs 2.4 cents to produce a single one cent coin.(Story) Taxpayers lose money every time a penny is made. It may not seem like
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Percent Mass of Copper in a Penny Introduction The purpose of this lab is to determine the percent mass of Cu in a penny and see if the fabricator that makes the planchets for the government is using the correct amounts of Cu in the pennies. The composition of a standard penny is 97.5% Zn and 2.5% Cu. In the lab we will be using Beer’s Law (A=elc+b where A is solution absorbance‚ e is a constant called molar absorbency‚ l is the length in cm‚ and c is the concentration). Using Beer’s Law in this
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Penny Press Until the early 1800’s‚ newspapers in England and America were expensive and therefore exclusive to the wealthy and literate minority. On average‚ newspapers would cost around six cents per issue and were usually sold through subscription only. Readers would have to pay for a years’ worth of newspapers when first signing up for a subscription‚ and that cost could be a middle-class worker’s week’s wage. Most people could not afford newspapers and therefore could not receive daily news
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CHEMISTRY PRACTICAL NOTES - SALT ANALYSIS S.No. | EXPERIMENT | OBSERVATION | INFERENCE | 1(a) | Noted the colour of the salt | BluePale greenGreenPale pinkColourless | May be Cu2+May be Fe2+May be Ni2+‚ Cu2+May be Mn2+Absence of Cu2+‚ Fe2+‚ Ni2+‚ Cu2+‚ Mn2+ | (b) | Noted the physical state of the salt | (i)Amorphous(ii)crystalline | May be CO32-May be Cl-‚ Br-‚ SO42-‚ NO3- | 2 | Action of heat:The given salt is heated in a dry test tube. | (i)Reddish brown vapours(ii)Crackling sound(iii)Yellow
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In the short story Penny in the Dust by Ernest Buckler‚ the author uses the method of presenting Peter’s view on this father and his father’s view on him by contrasting and comparing. By doing so‚ it shows that miscommunication will cause problems between people unless they open up to each other. Peter is portrayed as an imaginative child but at the same time has a very mature view on things especially towards his father. Being a child‚ he looks up to his father and respects and tries to understand
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