Elizabeth Au (1) Serena Chan (3) Sharon Chan (4) Christy Chan (5) BIOLOGY LAB REPORT Investigation of the effect of metal ions on enzyme activity Objective To study the effect of two heavy metal ions‚ lead (II) ions and silver ions on the enzyme activity of invertase. Introduction Hypothesis: The rate of enzyme reaction of invertase decreases and the reaction eventually stops as the heavy metal ions inhibit the enzyme reactions. Biological principle: Heavy metal ions are non-competitive
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precipitation reaction could be used to separate and remove silver ions from a mixture containing iron (III) and zinc ions? A precipitation reaction that could be used is hydrochloric acid Ag+(aq) + HCl(aq) AgCl(s) +H+(aq) – white. 2. What precipitation reaction could be used to separate and remove iron (III) ions from the remaining mixture containing iron (III) and zinc ions? Fe3+(aq) + 3NaOH(aq) Fe(OH)3(s) + 3Na+(aq) 3. How can the presence of silver ions be positively identified? AgCl(s) +2NH3(aq)
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1. Identify at least 10 minerals that are abundant in the Philiipines. Gold‚ Copper‚ Chromite‚ Platinum‚ Gravel‚ Silver‚ Nickel‚ Iron‚ Marble‚ Sulfur 2. Describe the characteristic features of each minerals. Gold- soft‚ lustrous yellow‚ malleable metal. It is one of the transition metals. It is highly sought after precious metal in jewelry Copper- is valued for strength‚ malleability‚ ductility‚ and ability to conduct electricity and heat. It is also non-magnetic‚ resists wear‚ and forms
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Kwabena Asomaning Post Office Box ST 55‚ STC Accra. Ghana T: + 233 26 2 797 443 / + 233 24 4 797 443 E: kwasomaning@gmail.com ………………………………………………………………………………………………….. Profile / Key Strengths • Highly skilled in teaching‚ research and personnel training • Skilled in people management • Dynamic and a quick on-the-job learner • Excellent presentation and communication skills • A good team player‚ results oriented and highly innovative Hobbies / Social Life • Dedicated to sports; swimming‚ tennis
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Katerina Baeza Hernandez | | | | | | | |Zn |Mg |Cu |Pb | | |(+) clear liquid but the |(+) a black spot appeared on|(-) no reaction occurred |(-) no reaction | |Pb(NO3)2
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chloride by the Mohr Method Objective: To determine chloride by using Mohr Method. Introduction: The Mohr method is the method used to determine the chloride ion concentration of a solution by titration with silver nitrate. As the silver nitrate solution is slowly added‚ a precipitate of silver chloride forms. Ag+ + Cl- AgCl(s) (Ksp for AgCl is 1.810-10) The chloride ion (Cl-) is an important anion found in solids and solutions. Chloride is the predominant anion of sea water with a molarity
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Hansa traded with Swahili cities along the coast of East Africa. Swahili cities had attracted many cultures looking for spices‚ gold‚ and other goods. Both Hansa and Swahili dominated in trade. The most valuable items to trade were gold‚ silver‚ and spices. (Doc 1) Coins discovered in Swahili Cities. This document shows the coins found from the classical era up until 1450 C.E in Swahili cities. Most of the coins were found in Sung china‚ a total of 212 coins were found. The least amount
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Extracting sliver from used X-ray films using new techniques SUMMARY Silver is one of the precious metals that exists as silver halides and dark silver in X-ray films therefore recycling it is essential. I decided to carry out my research in the field of extracting silver from used X-ray films using new technique that dose not deplete ant metallic resources or energy resources meaning that the project must be environmentally friendly. My research consists of two parts‚ part one which is carrying
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Gold and Silver in Singapore- Store Your Metals Offshore for Protection Storing your gold and silver in a safety vault may be handy and convenient‚ but as capital control is increasing every day‚ you may want to consider buying and storing your gold and silver abroad‚ for unrestricted transfer and selling in the future. Offshore gold storage prevents gold confiscation and keeps your gold’s selling price stable and as high as it can be. Storing gold in a safe‚ stable jurisdiction out of your home
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coinage so was new. Coins were prestigious only for their weight in silver or gold‚ and circled close varied differing kinds of valuable metal. this is often what’s called a bullion economy‚ within which the burden and also the cleanness of the precious metal square measure what’s essential‚ not what form the metal takes. By a good margin the foremost well-known metal within the economy was silver‚ albeit gold was likewise utilised. Silver circled as bars‚ or ingots‚ and in addition as adornments and trimmings
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