Grade 11 Chemistry Year End Test Multiple Choice Identify the choice that best completes the statement or answers the question. ____ 1. The molar mass of copper(II) sulfate pentahydrate‚ CuSO4.5H2O‚ is a. 245.6 g/mol d. 241.5 g/mol b. 177.5 g/mol e. 249.6 g/mol c. 219.2 g/mol ____ 2. A 100.0-g sample of a compound is composed of 16.3 g of carbon‚ 32.1 g of chlorine‚ and 51.6 g of fluorine. The empirical formula of the compound is a. CClF d. C3Cl2F6 b. CClF3 e. C9Cl6F18 c. C2Cl2F6 ____ 3. A
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treating acid with base. 4. To prepare crystal of copper sulphate from the given mixture of sand and copper sulphate. 5. To prepare barium sulphate by treating barium chloride with dilute sulphuric acid in pure state. 6. To separate sand and calcium carbonate in pure and dry state from the given mixture of sand and calcium carbonate. 7. To obtain pure water from supplied impure water by distillation process. 8. To cut‚ bend and round up of a glass tube in required angles. 9. To
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Black T‚ is a dye‚ and will form a pink complex in the presence of a metal cation. As EDTA solution is added to the solution‚ the metal ions will complex to the EDTA solution leaving the indicator solvated. The chemical equation‚ with the known calcium ion solution‚ looks as follows: Where H2In¯ represents the solvated indicator Erichrome Black T dye. H2In¯ + Ca 2+ ⇌ CaIn¯ + 2H (blue) (pink) As EDTA is added to the solution‚ it grabs the Ca ions away
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then washed with 1.5 mL of 5 % aqueous sodium bicarbonate. Then the aqueous lower layer was carefully removed. The upper layer was cloudy at first until it started to become clear after a few minutes. The solution was dried through anhydrous calcium chloride. Then it was weighted.
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Crispbread dippers is a snack pack with crispy crispbread formed as animals and creamy cheese spread. This product is ideal when you are hungry for a snack or as a lunchbox supplementation for children to bring to the kindergarten‚ nursery or to school. The product is kept in a small compartmented box‚ with room for the cream cheese and a room for the crispbread. The compartmented box is sealed with foil on the top‚ which is easy to remove and makes the product easy for children to handle. The sealing
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4.1 & 4.2: General properties of aqueous solutions and Precipitation Reactions: 1. (Brown 4.11) When asked what causes electrolyte solutions to conduct electricity‚ a student responds that it is due to the movement of electrons through the solution. Is the student correct? If not‚ what is the correct response? 2. (Brown 4.15) Specify what ions are present in solution upon dissolving each of the following in water: a. ZnCl2 c. (NH4)2SO4 b. HNO3 d. Ca(OH)2 3. (Brown 4.16 ) Specify
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will be kept in the water baths until they reach that temperature. This will require me to use a thermometer and place it in with the mixtures (5mins or more). Apparatus: • 2cm3 lactase enzyme • 8cm3 Sodium alginate solution • 100cm3 Calcium chloride solution • Hot water baths set at 30°C‚ 35°C‚ 40°C‚ 45°C and 50°C. • Small beakers x 4 • Syringes 5cm3 (precision +/- 0.05cm3) • Glucose strips/reagent strips Semi-quantitative (Diabur 5000)(max 3%) • 100cm3 beaker • Test tubes and rack
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student’s work (past or present). x__(Signature)______ Purpose Reference Materials and Chemicals Reaction: Procedure Results: Raw Downloaded Data Calculated Data for each temperature: moles of HCl moles of borax concentration of borax Ksp ΔG- using both equations (A and B!) Sample calculations - calculations of your data alone for all of the items listed above Graph lnK vs 1/T Show a trendline and provide the R2 value Determine ΔH (kJ/mol) and ΔS (J/mol K) from the graph SHOW
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A sterile syringe was then used to add 0.25 mL of calcium chloride to both tubes. The starter plate needed contained the colony of E.coli needed for the experiment. A sterile innoculating loop was gently scraped over the colony and transferred into the tube with the calcium chloride‚ by gently twirling the tube in the solution. Using the capillary micropipette and plunger‚ 10 picometers of the plasmid PUc8 solution
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immunity and reproduction. Sources: fish‚ carrots‚cod liver oil Deficiency: nyctalopia (blindness) Exophthalmia(dryness of the eyes) VITAMIN D (calceferol) Bone making and maintenance. Assist in the absorption of dietary calcium. The body can synthesize it with the help of sunlight. Helps to make Ca and P available in the blood. Sources: egg‚ soya beans‚ cod-liver oil‚ sunlight Deficiency: Osteomalacia (softening of the bone)‚ rickets (softening of the bone) Vitamins
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