Calculate the volume of 0.250 M H2SO4 that contains 0.250 g H2SO4. 0.250 g H2SO4 x 1 mole x 1 L = 0.0102 L 98.12 g 0.250 mole 5. 1.50 g of NaCl is dissolved in 100.0 mL of water. Calculate the concentration. 6.
Obtain an Erlenmeyer flask that has a vacuum opening and attach the vacuum tube to it 8. Insert funnel and rinse the funnel with distilled water 9. Turn vacuum on and pour the pink solution into the Erlenmeyer flask, the precipitate should stay on top of the filter 10. Rinse the beaker out until all residue is gone 11. Try to rinse the precipitate in the funnel until the pink color is gone 12.
0.00512 * 500 = 2.56 c. 0.00806 * 319.9= 2.56 d. 0.00806 * 319.9 = 2.56 500 mL =0.5 L e. 0.0161 * 500 / 2 =2.56 4. Exercise 4: a. 0.250M; 250 mL 0.25 L (0.25) (0.25) = 0.0625 moles ZnI2 b. Prepare the solution by dissolving 19.95 grams of Zinc Iodide with 250 mL of water. c. Prepare the solution by dissolving 38.90 grams of ZnI2 with 500 mL of water.
Then again, while leaving behind as much solid as possible, transfer as much liquid as possible into a pressure filtration assembly (p. 68 lab text) and filter the liquid into a clean, dry, tared 25 mL Erlenmeyer flask (tared = weighed empty). Be sure that the filter assembly is resting in the flask prior to transferring the liquid, as some liquid will filter through immediately. The filtration apparatus is made by pushing the micro Buchner funnel (polyethylene frit in place - no filter paper) into the end of a plastic pipet which has had the tip cut off and which has had a small hole cut into the squeeze bulb). Allow most of the liquid to filter by gravity, then, while holding your thumb over the hole in the squeeze bulb, gently apply pressure to complete the filtration. Care must be taken when squeezing the pipet bulb on the filter pipet.
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Stir or shake the solution until it is dissolved. This will produce a 1% salt solution. 6. Pour the salt mixture into a clean glass just tall enough that the bottom of the paper can touch
(b) What accounts for the difference(s)? (c) What specific process is occurring in each container? (d) How do you know when the processes are complete? (e) Use your observations to rank the three elements hydrogen, copper, and zinc from most to least reactive. a) Bubbles stop in the lemon juice first but are still forming in the vinegar.
Archimedes’ method Object Mass (g) Mass of Displaced Water (g) Volume of Displaced Water (mL) Density (g/mL) Metal Bolt 42.5 25 25 25 Magnet 16.2 3.5 3.5 3.5 Questions: An unknown, rectangular substance measures 3.6 cm high, 4.21 cm long, and 1.17 cm wide. If the mass is 21.3 g, what is this substance’s density (in grams per milliliter)? 1.2 g/ml A sample of gold (Au) has a mass of 26.15 g. Given that the theoretical density is 19.30 g/mL, what is the volume of the gold sample? 1.35 mL What would happen if you dropped the object into the beaker while using the Archimedes’ Principle method instead of submerging the object? The measurements would be the same.
Practice Question for Exam 2 Chem 103 |A chemical reaction requires 30.77 kJ. How many kilocalories does this correspond to? | |A) 7,354 kcal B) 7.354 kcal C) 128.7 kcal D) 0.1287 kcal E) 30.77 kcal | |776 J is the same quantity of energy as | |A) 7.76 × 105 kJ. B) 1.85 × 102 kcal. C) 0.185 kcal.
Express the fractions 3/4, 7/16, and 5/8 with the LCD. A. 9/16, 49/16, 36/16 B. 24/32, 14/32, 24/32 C. 12/16, 7/16, 10/16 D. 3/4, 2/4, 3/4 End of