give. Therefore‚ out of all the main group elements‚ Halogens react vigorously with Group 1 and Group 2 metals. All the alkali metals react vigorously with halogens to produce salts‚ most important NaCl and KCl. Sodium Chloride is used as a preservative for meat and to melt the ice on the roads. KCl is important for plant fertilizers since potassium helps plant growth. The metal halides form white ionic crystalline solids. They are all soluble in water except LiF because of a high lattice enthalpy due
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of solute (CH3OH) 8.87 g = 0.277 mol 32.04 g Molality Calculate the molality m = 0.277 mol CH3OH x 1000 g solvent 20.0 g H2O 1 Kg solvent = 13.8 m Molality • Determine the molality of 3000 g of solution containing 37.3 g of KCl. 37.3 g KCl = 0.5 moles KCl 74.6 g Molality • Determine the grams of pure solvent. Total = mass of solute + mass of solvent 3000 g = 37.3 g + mass of solvent 3000 g – 37.3 g = 2962.7 g of solvent Molality • Convert grams of solvent to kilograms 2962.7 g
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Guess Paper – 2009 Class – XII Subject –Chemistry : Solid State (Q.1) The appearance of colour in solid alkali metal halides is generally due to: ( 1 mark ) (a) Frenkel defect(b) Interstitial positions(c) F-centres(d) Schottky effect (Q.2) Schottky defects in crystal is observed when ( 1 mark ) (a) unequal number of cations and anions aremissing from the lattice(b) equal number of cations and anions are missing from the lattice(c) an ion leaves its normal siteand occupies an interstitial
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BTech Project HEART ATTACK DETECTION AND ALERT SYSTEM Submitted by Guided by AKANSHA WAJGE Prof. VIKAS UPADHYAYA AKSHITA BHANDARI DIBYA RAY K. REVATHI NIIT University Neemrana TABLE OF CONTENTS CERTIFICATE………………………………………………………………………………………………………………………..2 ACKNOWLEDGEMENT…………………………………………………………………………………………………………3 ABSTRACT………………………………………….4 INTRODUCTION…………………………………5 OBJECTIVE……………………………6 CIRCUIT DIAGRAM………………
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Strontium Chloride Procedure: 1. Put on safety goggles 2. Wear gloves when handling chemicals 3. Obtain a 250 – mL beaker half-full with water. Obtain 6 wooden splints 4. Obtain six weighing dishes labeled “CaCl2”‚ “CuCl2”‚ “LiCl”‚ “NaCl”‚ “KCl”‚ “SrCl2” – each containing a small scoopful of each metallic solid in the corresponding weighing dish 5. Put 10 drops of alcohol on the solid in the watch glass 6. Light a match – wooden splint – watch glass. Observe the
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Chemistry: A Molecular Approach (Tro) Chapter 9 Chemical Bonding I: Lewis Theory 1) Which of the following represent the Lewis structure for N? A) [pic] B) [pic] C) [pic] D) [pic] E) [pic] Answer: A 2) Which of the following represent the Lewis structure for Cl? A) [pic] B) [pic] C) [pic] D) [pic] E) [pic] Answer: B 3) Which of the following represent
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Use data obtained after the addition of 10 mL 0.1 M KCl. (Be sure to use the exact titrator reading for the 10 mL addition.) Slope‚ intercept‚ and the equation for the calibration line. (Be sure to use the actual variables‚ not y and x‚ in the equation.) The equation for the line must be calculated by the
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for a 70kg person. Electrolytes Sodium: 1 mmol / kg / day Potassium 1 mmol / kg / day i.e. 50 to 80 mmol of Sodium and of Potassium a day. Abnormal losses Losses from gut are common (vomiting). Usually replaced with 0.9% saline with 20mmol KCl. Insensible losses usually equate to 0.5ml / kg
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Chapter 8: Salts 1. Salts A salt is an ionic compound. The anion part comes from the acid while the cation part comes from a base. Example: KCl‚ KOH(aq) + HCl(aq) KCl(aq) + H2O(l) A salt is a compound formed when the hydrogen ion. H+ from an acid is replaced by a metal ion or an ammonium ion‚ NH4+. Salts Nitrate salts Carbonate salts Chloride salts Soluble All nitrate salts Potassium carbonate‚ K2CO3 Ammonium carbonate‚ (NH4)2CO3 Sodium carbonate‚ Na2CO3 All chloride salts Except Sulphate salts
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color change was observed. 7. We added 0.1 mol dm-3 of KCl into tube #4 using a pipette until a color change was observed. 8. We did not add anything to the tube #1 because we are going to use it for comparison purposes. Qualitative Data: Tubes | 1 | 2 | 3 | 4 | Initial Color | Reddish-Orange | Reddish-Orange | Reddish-Orange | Reddish-Orange | Added Substance | N/A | 0.1 moldm-3 FeCl3 | 0.1 moldm-3 KSCN | 0.1 moldm-3 KCl | Final Color | Reddish-Orange | Slowly turned darker | Rapidly
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