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Two metal cubes, one copper and one aluminum, with sides of length a are arranged as shown, find the thermal resistance of each cubeb
The data below were taken to calibrate the instrument. An unknown protein sample gave an absorbance of 0.867. Calculate the mass (micrograms) of protein in the unknown.
Estimate the value of resistances needed to make a variable timer for intermittent windshield wipers: one wipe every 15?s, 8?s, 4?s, 2?s, 1?s, Estimate the mininum value of the resistance
Draw the skeleton structure of the repeating unit of the polyester made from this molecule via a condensation reaction
A dentist's drill starts from rest. After 2.70 s of constant angular acceleration it turns at a rate of 3.0 104 rev/min, Find the drill's angular acceleration
Dissolving NH4Cl(s) in water is endothermic with a heat of the solution of 15.2 kJ/mol. If a 6.134 g sample of NH4Cl is added to 65.0 mL of water in a calorimeter at 24.5°C, what is the minimum
Calculate how much energy in the form of heat is available from 100mL of this mixture and compare it with the amount available from pure gasoline
A block of glass with flat sides is surrounded by air. A ray of light traveling in the glass (refractive index na) is incident on the flat interface with air at the top surface of the block of glass
What will be the pH if 0.00820 mol of HA (pKa=2.34) and 0.00820 mol of A- are dissolved in water to make 1.000 L of solution? this is a dilute acid problem
A coin placed 29.0 cm from the center of a rotating, horizontal turntable slips when its speed is 50.2 cm/s, What is the coefficient of static friction between coin and turntable
Sulfamic acid (FM 97.094) is a primary standard that can be used to standardize NaOH. What is the molarity of a sodium hydroxide solution if 38.92 mL react with 0.3341 g of sulfamic acid
Three capacitors (3.81, 5.89, and 11.3 ?F) are connected in series across a 45.0 V battery. Calculate the voltage across the 3.81 F capacitor?
Use the Nernst equation to calculate the expected potential in the battery in parts 2(d) and 2(e) when the following concentrations are present: [Cr2O72?] = 3.7 x 10?3 M ; [Cr3+] = 0.0112 M
Lead(II) phosphate, Pb3(PO4)2 (s), is allowed to come to equilibrium with its ions in otherwise pure water. Ksp = 3.0 x 10?44. Calculate the equilibrium concentration of each ion.
A copper wire with a cross sectional area of 3.00 mm^2 and a length of 2.00 m at 20.0 degrees C is connected to a 25.0 V battery, what is the resistance at 20.0 degrees C
Write a balanced equation with phase changes for an electrochemical cell that has a copper cathode immersed in a solution of cu+2 ions and a lead anode immersed in a solution of Pb+2 ions
A solution of NH3 was prepared by diluting 8.29 mL of 27.62 wt% NH3 [density=0.89 g/mL] up to 564.0 mL. The molecular mass of NH3 is 17.0305 g/mol. Find the concentration of NH3 in M.
a cross-sectional area of wire so as to produce a steady current of 5.00 mA, How many electrons passed this cross-sectional area in that amount of time
What are the correct oxidation states for the following compounds? P in H3PO4, Mn in Mn(O4)2- anion, and O in O2F2
In 1986 a gargantuan iceberg broke away from the Ross Ice Shelf in Antarctica. It was approximately a rectangle 160 km long, What is the mass of this iceberg, given that the density of ice is 917 kg/m
The rest mass of a proton is 1.0072764669 u and that of a neutron is 1.0086649156 u. The 75As nucleus weighs 74.92160 u. Calculate the total binding energy of the nucleus.
An equipotential surface that surrounds a point charge q has a potential of 585 V and an area of 1.27 m2. Determine q
What is the partial pressure of hydrogen in the collection flask? (Note that the hydrogen is collected over water so there will be gaseous water in the flask along with the hydrogen. At 23°C, th
For the titration of 87.95 mL of 0.1311 M NaOH with 1.2586 M HBr, find the pH of the solution within the receiving flask when 7.87 mL of HBr is added.
Two point charges, +3.75 µC and -6.05 µC, are separated by 1.21 m. What is the electric potential midway between them