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Question 1) True or false. The thermocline is the depth at which there is the greatest temperature gradient.
Question 2) What does this equation represent? Select the TWO correct answers
2CuS (s) + 4H+ (aq) + O2 (g) = 2Cu2+ (aq) + 2S + 2H2O
A. Oxidation of copper by oxygen
B. Leaching (solubilisation) of copper in an acidic solution
C. Reduction of copper in a copper sulfide by oxygen
D. Oxidation of sulfur in the mineral copper sulfide by oxygen
E. Reduction of sulfur by oxygen
Sodium azide (NaN3) is sometimes added to water to kill bacteria. Calculate the concentration of all species in a 0.010 M solution of NaN3. The Ka value for hydrazoic acid (HN3) is 1.9 * 10-5.
When a 5.60 g sample of solid sodium hydroxide dissolves in 100.0 g of water in a coffee-cup calorimeter, the temperature rises from 22.3 degrees Celsius to 41.6 degrees Celcius.
What amount of energy is required to melt a 13.5 g piece of ice at 0oC to form liquid water at the same temperature of 0? The heat of fusion of water = 333 J/g , T he specific heat of H2O is approx. constant at 4.18 J/g x C.
A buffer is made by combining 3.50 L of 0.200M butylamine, C4H9NH2 with 7.50L of 0.100M butylammonium chloride, C4H9NH3Cl. Assuming that volumes are additive
How many grams of NaCl is needed to prepare 100.0ml of 1.50 molar solution of NaCl in a volumetric flask.
One mole of an ideal gas, initially at 30 ºC and 1 bar undergoes the following mechanically reversible changes. It is compressed isothermally to a point such that when it is heated at a constant volume
Small quantities of oxygen can be prepared in the lab by heating potassium chlorate, KCIO3(s) 2KClO3 -> 2KCl+3O2 Calculate how many grams of O2(g) can be produced from heating 59.4g of KClO3(s)
In the following problem you must: 1) Determine the correct formula for each reactant and product. 2) Determine the correctly balanced chemical equation.
elemental sulphur occurs in the solid state as 8-membered rings arranged in rhombohedral crystal structure s8 which
A buffer is prepared by mixing 204 mL of 0.452 M HCl and 0.500 L of 0.400 M sodium acetate. What is the pH
A titanium bicycle frame contains the same amount of titanium as a titanium cube measuring 6.6cm on a side. 1) Use the density of titanium to calculate the mass in kilograms of titanium in the frame.
How many moles of glucose does it take to make 1 mole tripalmitin and what is the net ATP balance
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