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When the surroundings absorbs heat, is the heat change of the system (qsystem) positive or negative?
a)positive (> 0)
b)negative (< 0)
Brine is a heavily salted solution used for pickeling. What tests could be used to identify the ions present? What should uoi see
The healthcare provider recommends that she take the Benedict's test. Assume that the glucose levels of the patient are high. State the composition and the properties of the ketohexose derived from fruit jam.
You have a sample of a white crystalline substance from your kitchen. You know that it is either salt or sugar. Although you could decide by taste, suggest another property that you could use to decide.
Describe how you will prepare a buffer system of 0.50 M nitrous acid and sodium nitrite, pH 3.60.
Calculate the concentrations of all species in a 0.840 M Na2SO3 (sodium sulfite) solution. The ionization constants for sulfurous acid
What is the pH of a buffer prepared by adding 0.45 mol of the waek acid HA to 0.608 mol of NaA in 2.00 L of solution? The dissociation constant Ka of HA is 5.66e-7
The nuclide 18f decays by both electron capture and beta plus decay. Find the difference in the energy released by these two processes. The atomic masses are 18F = 18.000950 and 18O= 17.9991598.
What would happen to the energy yeild of glycolysis if you replace all phophate with arsenate knowing that arsenate can be released by hydoplysis of any arsenate-containing compound formed.
A solvent and solution are separated by a semipermeable membrane how does the height of the column of solution change if the concentration of the salt is increased?
Choose the selection which correctly identifies the forces which must be overcome to convert SbF5 from a liquid to a gas. Only London dispersion forces must be overcome.
After simple distillation, could GC have been used to determine purity of the distillate (final compound). If so, briefly and completely explain
A solution is made by mixing 30.0 mL of ethanol, C2H6O, and 70.0 mL of water. Assuming ideal behavior, what is the vapor pressure of the solution at 20 °C. Ethanol density=0.789 Vapor Pressure (Torr)=43.9 Water density=0.998 Vapor Pressure (Torr)=..
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