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Water's heat of fusion is 80. , and its specific heat is 1.0. Some velomobile seats have been designed to hold ice packs inside their cushions. If you started a ride with ice packs that held 1800 of frozen water at 0 , and the temperature of the water at the end of the ride was 32 , how many calories of heat energy were absorbed?
A galvanic cell Zn / Zn2+ // Cu2+ / Cu generates a current of 4.00 Amperes for 1.00 hour. The cathode increases in mass by 10.0g . If charge on an electron is 1.602 x 10-19 coulombs/ electron. Calculate the Avogadro's number using these experimenta..
what 2 substances undergo a physical change if the temperature is reduced from 50 degrees celcius to negative 50 degrees celcius. what is the physical change that takes place in each case.
Buffers are important physiological compounds that resist a change in pH. Calculate the pH of system that is 0.25 M benzoic acid and 0.75 M benzoate if the pKa = 4.2.
Provide a structure for the following compound: EI mass spectrum: two molecular ions of about equal intensity at m/z = 180 and 182; IR: 1740 cm-1; 1H NMR: ? 1.30 (3H, t J = 7 Hz); ? 1.80 (3H, d, J = 7 Hz); ? 4.23 (2H, q, J = 7 Hz); ? 4.37 (1H, q, ..
A student wants to prepare exactly 1000 mL of a 0.500 M aqueous potassium hydroxide solution. What mass of potassium hydroxide should the student dissolve in the solution?
What is the FORMULA for the limiting reagent? c.What amount of the excess reagent remains after the reaction is complete? IN GRAMS
If 141 mL of wet H2 is collected over water at 24°C and a ba?rometric pressure of 738 torr, how many grams of Zn have been consumed.
Using chemical equations, show how the triprotic acid H3PO4 ionizes in water. Phases such as (l) or (aq) are optional Ka1 = ? Ka2 = ? Ka3 = ?
A chemistry student prepares acetone by decomposing 12.3 g of calcium acetate. If the student collected 2.50 g of acetone and the theoretical yield is 3.42 g.
Compare trials 1 and 2 to determine the order of reaction with respect to iodide ions. How did the concentration of iodide ions change in these two trials, and how did the rate change accordingly? What is the reaction order for iodide?
a quanity of gas exerts a pressure of 98.6 kpa at a tempature of 22 degrees celcius. If the volume remains unchanged, what pressure will it exert at -8 degrees celcius
The Group 5A elements can form molecules or ions with thre, five or six covalent bonds. Predict the molecular structure and hybridization of the following substances: NH3, AsCl5 and PF6-.Why does't NF5 or NCl6- form
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