Name: __________________________________ Teacher: ________________________________ DO NOT OPEN THE EXAMINATION PAPER UNTIL YOU ARE TOLD BY THE SUPERVISOR TO BEGIN Chemistry 2202 FINAL EXAMINATION June 2010 Value: 100% General Instructions This examination consists of two parts. Both parts are contained in this booklet and further general instructions are provided on appropriate pages. Part I – Multiple Choice (40%) Select the letter of the correct response from those provided. EITHER
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result of the chemical reaction to be a moisturizer soap. First‚ our main ingredient to make a moisturizer soap is the Broccoli plant and second Fatty acids‚ and there lots of type of oils but we will use only the Coconut oil. Then‚ we will also need a Sodium Hydroxide (NaOH) or also can be called Lye or Caustic Soda. The Lye is dissolve in liquid water and adds into the Coconut oil and your Broccoli too. And when those three different types of ingredient combines together it starts the process called
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Reaction rate = fixed amount of reaction time taken time taken From this we can see that the reaction rate is proportional to l ÷ time. THE DISAPPEARING CROSS The reaction used in this experiment is between dilute hydrochloric acid and sodium thiosulphate (formula Na2S2O3). You can see from the chemical equation below that one of the products is sulphur‚ which does not dissolve in water. [pic] As the reaction proceeds‚ a fine precipitate of sulphur forms‚ which makes the water go
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they probably would state with the Periodic Table. The Periodic Table consists of many elements‚ for instance: Sodium (Na) is a metal‚ which is located in group 1‚ period 3‚ with an atomic number 11 and has a mass of 22.99. Chlorine (Cl) a nonmetal located in group 7A‚ also in period 3‚ with atomic number 17‚ and a mass of 35.45. When these two elements are put together‚ they make Sodium Chloride (NaCl)‚ which is table salt that people use every day. In the periodic table‚ there are many different
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* 2 g Potassium Iodide per parts A‚ B‚ C * 2 g Sodium Chloride per parts A‚ B‚ C * 2 g Sucrose per parts A‚ B‚ C * 6 Bunsen Burners * 6 Test Tubes with 25 ml Ethanol each * 6 Test Tubes with 25 ml Water each * 6 100 ml beakers with 50 ml Water each * 10 g Calcium Chloride per parts D * 10 g Citric Acid per parts D * 10 g Phenyl Salicylate per parts D * 10 g Potassium Iodide per parts D * 10 g Sodium Chloride per parts D * 10 g Sucrose per parts D
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Cell Membrane Transport The purposes for these experiments is to be able to understand osmosis and its relationship to tonicity of solutions‚ and the transportation of molecules across cell membranes. It’s also used to understand‚ and how temperature affects diffusion. You also learn how to test for presences of starches and sugars in solutions. In the first exercise I will be testing for diffusion through an artificial membranes. This one has forty five steps to it. I will not go into
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formed from a weak acid and a strong base hydrolyze to form a solution that is slightly basic. In this kind of hydrolysis‚ it is the anion from the weak acid that actually reacts with the water. For example‚ when sodium acetate‚ NaC2H3O2‚ hydrolyzes‚ water molecules react with the acetate ion: C2H3O2- + H2O ---------> HC2H3O2 + OH- The formation of the OH- ion from this reaction makes the solution basic. Salts formed from a week
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grinding machine. Water is added to make a fine particles or a mush of the ore. Then the particles or mush is combined with potassium cyanide or other kind of cyanide. To prevent the toxic hydrogen cyanide during the process‚ calcium hydroxide or sodium hydroxide is often added to maintain the solution to strongly basic. The method of using cyanide instead liquid mercury was developed at Scotland in 1887. The process was first used on the Rand in 1890 and‚ It tons of investment for larger gold mines
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associated with even small amounts of each of the following: a. concentrated hydrochloric acid‚ HCl HCL may be corrosive. It can cause burns to dosy tissue and can be deadly if inhaled or swallowed. b. sodium hydroxide‚ NaOH‚ solution NaOH is a very corrosive chemical and contact with it can cause burns to body tissue and possible eye damage. Can irriate the lungs and can cause permanent lung damage. also contact with water can generate enought heat
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the same as one of the known elements‚ then they are the same element. Materials * Samples of the following metallic salts * calcium chloride * copper chloride * iron chloride * lithium chloride * potassium chloride * sodium chloride * strontium chloride * unknown 1 * unknown 2 * Bunsen burner and accessories * Safety goggles * Lab apron * Splints soaked overnight in distilled water * 250 mL. beaker full of distilled water * Popsicle
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