Element: Chlorine General Information We researched the chemical element known as chlorine. Chlorine has an atomic number of 17 and an atomic weight of 35.453. It has a valence number of 3. The element has 3 energy levels. Chlorine exists as a greenish-yellow gas at normal temperatures and pressures. Chlorine is second in reactivity only to fluorine among the halogen elements. Chlorine is a nonmetal. It is estimated that 0.045% of the earth’s crust and 1.9% of sea water are chlorine. Chlorine
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Determination of the concentration of chlorine ions Aim: To compare the concentration of chloride ions in pool and tap water respectively. Background: Tap water contains a variety of dissolved ions such as Ca2+‚ Mg2+‚ Na+‚ HCO3- and Cl-. In this experiment we will determine the concentration of the Cl- ions‚ and comparing it to the concentration found in a sample of pool water. The method used is the standard one for determining the concentration of chloride ions: titration with
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precipitate with alcoholic silver nitrate (Q.2) Dry ether The reaction RX + 2Na + RX _______________? R-R + 2NaXis called. ( 1 mark ) (a) Sandmeyer’ reaction (b) Fittig reaction (c) Wurtz reaction (d) Williamson’s synthesis (Q.3) Substitution of chlorine takes place readily at higher temperature in : ( 1 mark ) (a) CH3CH=CH2 (b) H2C=CH2 (c) HC C (d) None of the above (Q.4) (CH3)3CMgBr on reaction with D2O gives: ( 1 mark ) (a) (CH3)3CD (b) (CH3)3COD (c) (CD3)3CD (d) (CD3)3OD (Q.5) The silver
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ractice Problem #1: Oxygen gas can be produced by decomposing potassium chlorate using the reaction below. If 138.6 g of KClO3 is heated and decomposes completely‚ what mass of oxygen gas is produced? KClO3 (s) --> KCl (s) + O2 (g) [unbalanced] Answer to Practice Problem #1: 1. Balance your equation first. 2KClO3 (s) --> 2KCl (s) + 3O2 (g) [balanced] 2. Convert from grams to moles using molar mass.
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CHLORINE Chlorine is an element I would like to present today. It is discovered in 1774 by Carl Wilhelm Scheele and was named by Sir Humphry Davy in 1810‚ after a Greek word‚ khlôros‚ which means greenish yellow. Chlorine is in the halogen group in the periodic table with an atomic number of seventeen. Pure chlorine is yellowish-green but most common compounds with chlorine are typically colourless. The element itself was first produced in 1774 by Carl Wilhelm Scheele‚ by heating hydrochloric acid
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26.5g sample of impure paracetamol contains 24.5g of pure paracetamol. Calculate the % purity of this paracetamol. %purity = pure/impure x 100 = 24.5/26.5 x 100 = 92.5% 4. When 11.50g of sodium reacts with excess chlorine‚ 22.3g of sodium chloride is made. 2Na + Cl2 2NaCl Ar : Na = 23‚ Cl = 35.5 Calculate: a.
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Water Disinfection Chlorine and Ozone‚ Which is More Efficient The use of chlorine and ozone in water disinfection is prevalent throughout the modernized world. Both options allow us to take water that was previously thought unusable and to change it into potable water. These options allow us to eliminate chemicals‚ microorganisms and disease from water such as cholera‚ e-coli‚ cryptosporidium‚ giardia‚ enterovirus‚ and many more including metals. There are pros and cons to both treatment processes
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iLab‚ Week # 3 ATOMIC WEIGHT OF MAGNESIUM LAB Introduction The purpose of this lab experiment is to determine the atomic weight of magnesium by measuring the amount of hydrogen gas evolved when hydrochloric acid reacts with magnesium. The reaction is as followed: Mg + 2HCL H2 + Mg2+(aq) + 2Cl-(aq) In this experiment there is a one to one relationship between the number of moles of hydrogen gas evolved and the moles of magnesium metal consumed in the reaction. Therefore in the finding of
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ATOMIC WEIGHT OF MAGNESIUM LAB Introduction The main purpose for this experimental lab is to determine the atomic weight of magnesium‚ as well as an underlying purpose in determining the relationship between moles evolved and consumed. This can be demonstrated by measuring the hydrogen gas evolved by performing a chemical experiment when hydrochloric acid reacts with the magnesium. The formulated reaction includes; Mg + 2HCl → H2 + Mg2+(aq) + 2Cl- (aq) The major findings contributing
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QUALITY CONTROL LABORATORY Mam Dawn Assay of HCL Aqueous Alkalimetry Direct titration 0.1N NaOH Methyl Red TS HCL + NaOH NaCl + H2O Assay of Diluted H3PO4 Aqueous Alkalimetry Direct titration 0.1N NaOH Thymolphthalein TS H3PO4 + 2NaOH Na2HPO4 + 2H2O Assay of H3BO3 Aqueous Alkalimetry Direct titration 0.1N NaOH Phenolphthalein TS H3BO3 H+ + BO2- + H2O
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