2 mL of the cobalt chloride solution was added to three separate test tubes (A‚ B‚ and C). 1 mL of silver nitrate (milky white color) was added in test tube A Three gains of calcium chloride was added to test tube B 1 mL of Hydrochloric Acid was added to test tube C Activity D: Solubility of Carbon Dioxide: Approximately 10 mL of fresh seltzer water has mixed with 20 drops of 0.04 % bromcresol green indicator. The initial
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Mike Taylor Chemistry for CAPE by Susan Maraj and Arnold Samai Periodic Trends in Group II Elements in Group II The elements in Group II are called alkaline earth metals. Be‚ Mg‚ Ca‚ Sr‚ Ba‚ Ra Beryllium‚ Magnesium‚ Calcium‚ Strontium‚ Barium‚ Radium These elements bond by metallic bonds (intramolecular forces) to form giant metallic structures. The size of the atoms increases down the group Physical properties of Group II metals Ionization The
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equation: 2 KI (aq) + Cl2 (g) à 2 KCl (aq) + I2 (g) a. How many moles of I2 are produced? b. How many moles of KI were used? c. How many grams of KI were used? 6. Solid iron (III) hydroxide decomposes to produce iron (III) oxide and water vapor. If 0.75 L of water vapor are produced at STP‚ a. How many grams of iron (III) hydroxide were used? b. How many grams of iron (III) oxide were produced? 7. Solid iron reacts with sulfuric acid (H2SO4) to produce iron (II) sulfate and hydrogen gas. If 650 mL of hydrogen
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Yes | Light bubbles | Light but more visible bubbles and light brown liquid | Copper Sulfate (CuSo4) | Yes | Light bubbles | Changes color to brown and oxidation is observed | Ethanol (c2H5OH) | No | Nothing changes | Nothing changes | Calcium Hydroxide (Ca(OH)2) | Yes | Light bubbles | Light bubbles but more than in anode | Potassium Bromide (KBr2) | Yes | Produced yellow color and bubbles | Bubbles | Sodium Iodide (NaI) | Yes | Produced yellow brown and bubbles | A lot
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Materials in Our Daily Life : 95 : 21 Materials in Our Daily Life The basic aim of science is not only to study and understand natural phenomena but also to use this knowledge to make our lives more comfortable. Science and technology have enabled us to develop more economical and convenient methods to recover useful materials from nature and to put them to various uses. Chemistry has enabled us to synthesize new materials which have desired properties‚ thus‚ making them even better than natural
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uses of salt in cooking‚ salt is used in many applications‚ from manufacturing pulp and paper‚ to setting dyes in textiles and fabric‚ to producing soaps‚ detergents‚ and other bath products. It is the major source of industrial chlorine and sodium hydroxide‚ and used in almost every industry. Sodium chloride is sometimes used as a cheap and safe desiccant because it appears to have hygroscopic properties‚ making salting an effective method of food preservation historically; the salt draws water out
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cleaners. 5) e.g. i) Glass cleaners contain ammonia. ii) Drain cleaners and oven cleaners usually contain sodium hydroxide or potassium hydroxide. 10.2 ACIDS and ALKALIS in the LABORATORY Common ACIDS in the Laboratory Common ALKALIS in the Laboratory hydrochloric acid sulphuric acid nitric acid sodium hydroxides solution potassium hydroxide solution calcium hydroxide solution ammonia solution Safety Precautions when Handling Acids and Alkalis 1) Many acids and alkalis are irritant
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6 Rb Rubidium 7 LiCl Lithium Cloride 8 AlBr3 Aluminum (III) Bromide 9 KMnO4 Potassium Manganate (VII) 10 Cu(OH)2 Copper (II) Hydroxide 11 FeSO4 Iron (II) Sulfate 12 NH4Cl Ammonium Chloride 13 ZnCO3 Zinc Carbonate 14 SnF2 Tin (II)Fluoride 15 MgSO4 Magnesium Sulfate 16 MnO2 Manganese (IV) Oxide 17 Ca3(PO4)2 Tricalcium Phosphate 18 NaOH Sodium Hydroxide 19 HCl Hydrogen Cloride 20 Ba(HSO3)2 Barium Bisulfite 21 HNO3 Hydrogen Nitrate 22 FeSO3 Iron (II) Sulfite 23 Al2S3 Aluminum Sulfide
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BACK TITRATION AIM - To estimate volumetrically the amount of calcium carbonate present in the eggshell and analyzing the sources of errors to evaluate the result. Part A: Standardization of 2M NaOH(aq) Data Collection : Weight of substances Uncertainty Weight of watch glass + salt (potassium hydrogen phthalate) w1= 23.4380g ± 0.001g Weight of watch glass ( after emptying the salt)w2 = 21.5430g ± 0.001g Weight of salt (potassium hydrogen phthalate) w1 –w2= (23.4380± 0.001g) – (21
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to help build muscle and other tissues. It also contains enzymes to speed up the process of breaking down materials in your body such as food. Last but not least‚ it is a great source of vitamin A‚ for eye sight‚ and vitamin D‚ to help absorb the calcium in your body to build bone strength. Despite the fact that on the milk carton it says it contains all
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