Dissolve 5.6 g triphenylphosphine in about 30 mL acetonitrile with gentle warming on a steam bath. Suspend 0.5 g copper (I) oxide in 10 mL acetonitrile in a wide test tube and add concentrated sulfuric acid drop wise with constant swirling until the red color has discharged and most of the solid has dissolved. You should need no more than about 0.5 cm3 for this. Add the copper solution to the triphenylphosphine solution and filter the mixture by gravity. Evaporate the filtrate to about 20 mL on a steam bath in the fume hood and allow cooling to room temperature. Precipitate the product by adding diethyl ether slowly with constant stirring, about 50 mL should suffice. Filter the product, dry at the pump and record the weight obtained. Record the infrared spectrum of the compound as before. Carry out fragment analysis using the S-O bonds as the basis set to deduce the number of S-O stretches expected in the infrared and Raman spectra of sulfate ion in the three coordination modes illustrated above. Required:
Compare these predictions with the infrared spectra of the complexes and hence deduce the coordination mode of the sulfate ion.

Part b: study of equilibrium on solubility: mg(oh)2(s) ⇌ mg2+(aq) + 2 oh–(aq) cloudy clear (pink) 7. a. b. 8. a. b. 9. 10. 11. 12. when adding concentrated hydrochloric acid, how did the appearance of the equilibrium mixture change? the change in appearance indicated a shift in the point of equilibrium. in which direction did the equilibrium shift? (l) left (r) right explain your answer to question 7a. you should indicate which ion was added to or removed from the equilibrium mixture. when adding edta, how did the appearance of the equilibrium mixture change? the change in appearance indicated a shift in the point of equilibrium. in which direction did the equilibrium shift? (l) left (r) right explain your answer to question 8a. you should indicate which ion was added to or removed from the equilibrium mixture. upon heating in which direction is the equilibrium shifting? upon cooling in which direction is the equilibrium shifting? is the forward reaction a. endothermic explain your answers to questions 9, 10, and 11. (l) left (r) right (l) left (r) right b. exothermic

For a family dinner, jose’s mom baked a loaf of bread. during the meal, his grandmother commented, “this bread is so dense! ” what do you think his grandmother meant by the word dense? you have some ideas regarding density already, but this experiment will enrich your understanding of the relationship between mass, volume and the density of objects. when making measurements in this experiment we will be using si units, the international system of units. the purpose of using si units is to have the ability to communicate and compare data results with other experiments without having to make conversions. measurement symbol si unit length m meter mass kg kilogram volume l liters density kg/l kilograms per liter any calculations that are performed during this experiment will ultimately be reported in scientific notation. recall that scientific notation is extremely important when we have data that is extremely small or large. scientists rely on a standard form of communication to quickly make hypotheses and judgements based on data. what is the density of block a? a0kg/l what is the density of block b? a1kg/l what is the density of block c? a2kg/l what is the density of block d? a3kg/l what is the density of block e? a4kg/l which block is the densest? a5

He nucleus contains the cells genetic material in the form of dna. dna is organized into our chromosomes, which are made up of thousands of that determine our traits.