in biological systems‚ it is important to be able to experimentally analyze and isolate amino acids by separation techniques. One such method of separation is thin layer chromatography (TLC). In this method‚ a silica coated aluminum plate is spotted with the solution being separated‚ and the plate is placed in a developing jar containing a small amount of solvent. With time‚ the solvent
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Review: Breathing Underwater by Alex Flinn Breathing UnderwaterBreathing Underwater by Alex Flinn is written as a series of journal entries. The journal is written by Nick as an assignment from the judge who also sends him to anger management after the girlfriend he beat up finally presses charges. The book was published in 2001‚ before the recent increase in dating violence novels‚ and it tells a story often overlooked‚ that of the abuser instead of the abused. It ’s a delicate subject. And
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Confirmatory Tests for Cations & Anions prepared by alex teoh / Update: 29 Dec 2004-2205 h / 1st pub: 7 Sep 2001 @ CHIJ-St Joseph’s Convent Test for CATions * All cations must be present in aqueous states before tests can be conducted.. CATion ammonium zinc Reaction with aqueous Sodium Hydroxide NO ppt. Ammonia gas produced on warming. White ppt. [y] Soluble in excess aq. NaOH to form a colorless solution. [z] Zn2+ + 2OH- Zn(OH)2 (white ppt) Zn(OH)2 + 2OH- [Zn(OH)4]2- (aq) White ppt
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Testing for Cation and Anions OBJECTIVE: • Determine the presence of a cation or anion by a chemical reaction • Determine the cation and anion in an unknown solution All salt solutions have both positive (Cations) and negative (Anions) ions dissolved in it. In this experiment you will observe chemical reactions to determine the presence of specific anions and cations. Compare your observations with the reactions of the known solutions and the unknown solution to determine the ions present
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involves using a nichrome wire loop to introduce a sample into a quiet blue Bunsen flame. Many cations show characteristic colours. The nichrome wire is easily contaminated and was cleaned by dipping it into concentrated hydrochloric acid and heating vigorously with a roaring Bunsen flame. The wire is clean when it gives no colour with the flame. Result of flame testing cations: |Cation Tested |Colour of Flame
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iLab‚ Week #2 CATIONS AND ANION LAB Introduction In this experiment we will be mixing two ionic compounds: potassium chromate and lead nitrate; both are soluble in water. This will be demonstrating a double-replacement reaction/reactions between cations and anions. If a reaction does occur it will form a precipitate due to one of the newly formed compounds not being soluble in water. Once the experiment was completed there was what appears to be a “solid” substance remaining in the
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Name: Lisa Brewer iLab‚ Week # 2 CATIONS AND ANION LAB Introduction The purpose of this week’s lab is to learn to demonstrate a double-replacement reaction of ionic compounds. To accomplish this‚ two ionic compounds will be mixed together and the product will precipitate out of solution. In this procedure‚ the product must be precipitated out of the solution and then weighed. For this lab‚ lead (II) nitrate (Pb(NO3)2) and potassium chromate (K2CrO4) will be reacted together to demonstrate
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CHAPTER 6 MECHANICAL-PHYSICAL SEPARATION PROCESSES Introduction Separation Processes Many chemical processes materials and biological substances occur as mixtures of different components in the gas‚ liquid‚ or solid phase. In order to separate or remove one or more of the component from its original mixture‚ it must be contacted with another phase. The two-phase pair can be gas-liquid‚ gas-solid‚ liquid‚ or liquid-solid. Absorption When the two contacting phases are a gas and a liquid
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and boiling points to differentiate between pure and impure substances. ➢ Select appropriate methods for separating given mixtures. ➢ Describe appropriate methods of separating given mixtures. ➢ Perform simple experiments involving separation of mixtures. TIME REQUIRED: Minimum: 16 periods of 40 minutes each MAIN CONTENT AND CONCEPTS TO EMPHASISE: • Criteria of purity: melting and boiling points for determining whether a substance is a mixture or pure. • Types of
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Introduction The goals of this experiment were to determine periodic trends in solubility of group 2 metals. The other goal was to use our knowledge of solubility’s to identify cations present in a single unknown Xe and double unknown XXe. I have hypothesized that the solubility of group 2 elements will decrease as we progress down the periodic table .I think that this will happen because of effective nuclear charge (Zeff) which
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