Section A (Answer ALL questions in this Section.) 1. Rubidium (Rb) and potassium belong to the same group in the Periodic Table. The relative atomic mass of rubidium is larger than that of potassium. (a) Explain whether rubidium is more reactive than potassium. (b) Write a chemical equation for the reaction between rubidium and water. (State symbols should be given.) (c) Suggest how rubidium can be stored safely in the laboratory. (d) Suggest ONE safety precaution for handling
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chlorine is a poisonous gas; used in emergent properties of a compound‚ when chemically combined with sodium it forms sodium chlorine also known as table salt. Out of the several elements in the human body‚ one of them being chlorine makes up 0.2% of our body mass. Lastly‚ we see Chlorine in electron transfer and ionic bonding: “When an atom of sodium (11Na) encounters an atom of chlorine (17Cl) a sodium atom has a total of 11 electrons‚ with its single valence electron in the third electron shell. A
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substance‚ and is used in whitening clothes‚ removing stains‚ and even cleaning the bathrooms. It is a clear substance with a very strong odor‚ and has a pH of 12.6‚ meaning that it is a base. The common household bleach is made up of 5.25% sodium hypochlorite (NaClO). Bleach can cause skin irritation‚ and even serious damage to eyes or blindness if it splashes into the eyes. It should be handled with caution‚ and should not be allowed to mix with any other household substance because it may produce
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With Calcium Hypochlorite and Acetone When chlorine is passed into boiling alcohol‚ both chlorination of the methyl group and oxidation of the primary alcohol group to an aldehyde occur‚ giving trichloro-acetaldehyde or chloral: When chloral is treated with caustic alkali‚ fission of the C-C linkage occurs‚ giving chloroform and a formate. Acetaldehyde and also many ketones‚ such as acetone‚ containing the CH3CO- group behave similarly when treated with calcium or sodium hypochlorite‚ chlorination
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labeled Hydrochloric Acid‚ I sucked up the diluted HCl and placed the pipet upside down in a well plate for standby until needed for the experiment. For Ammonia and Sodium Hydroxide‚ I followed the same procedure that I did for HCl with the exception that the diluted solution for Ammonia was made in well A2 and the diluted solution for Sodium Hydroxide was made in well A3. Now that the diluted solutions have been created and contained‚ I must move on the main experiment. In order to conduct this experiment
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oxygen in the water. If acid isn’t added the solution will quickly start to turn yellow due to formation of MnO2. If this happens anyway‚ add some more sulphuric acid to reverse the process. The solution should be clear with a slight green tinge. Chapter 15 – Volumetric analysis (Redox titrations) To prepare a standard solution of ammonium iron sulphate and use this solution to standardise a solution of potassium permanganate. Potassium permanganate (KMnO 4 ) is a powerful oxidizing agent and is
Free Titration
B. INTRODUCTION Many common household chemicals are dangerous. They may be reasonably safe when used as directed‚ yet contain toxic chemicals. And one of the most dangerous household chemicals is the household bleach since it contains sodium hypochlorite‚ a chemical that can cause irritation and damage to the skin and respiratory system if inhaled or spilled on the skin and most people who get allergic reactions and minor injuries during a prolonged use. Just like lead poisoning‚ the effects
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SOAP & DETERGENT I) Definition of Soap o Soap are sodium or potassium salts of long-chain carboxylic acids o The general formula of a soap : RCOO Na / RCOO K • R is an alkyl group which contain 12 to 18 carbon atoms. II) The history of soap manufacturing. ▪ Solvay Process - Carbon dioxide ( obtained from heating CaCo ) is passed into concentrated NaCl solution which is saturated with ammonia . NaCl +NH +H
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Mount Preparation Record your observations. Part 4: Direct Staining: Record your observations for each sample. Part 5: Indirect Staining: Examine the stained specimens and record your results. Questions: A. What are the advantages of using bleach as a disinfectant? The disadvantages? The advantages of using 70% alcohol? The disadvantages? The advantages of using bleach as a disinfectant is strong and effective disinfectant. Its active ingredient‚ sodium hypochlorite‚ denatures
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masses‚ and the three volumes (from the three trials) needed to titrate the bleach Calculations (Data and Calculations Section in lab) 1. Use the equations given on the front page to determine the number of moles of sodium thiosulfate that are equivalent to one mole of sodium hypochlorite. 2. From your three trials‚ calculate the average volume of Na2S2O3 needed for the titration of 25.00mL of diluted bleach. 3. Use the average volume and the molarity of Na2S2O3 to determine the molarity of the diluted
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