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A 2.5-kg block slides down a 25 degree inclined plane with constant acceleration. The block starts from rest at the top. At the bottom, its velocity reaches 0.65 m/s. The length of the incline is 1
What mass of oxygen is needed for the complete combustion of 1.90×10-3 g of methane
One mole of an ideal gas is sealed in a 22.4-rm L container at a pressure of 1.00 rm atm and a temperature of 273 rm K. The temperature is then increased to 305 rm K, but the container does not expa
In an experiment, 5.00 L of N2 is saturated with water vapor at 22°C and then compressed to half its volume at constant T.
A person throws a stone straight upward at an initial speed of 15 m/s on a bridge that is 25m above the surface of the water. If the stone just misses the bridge on the way down, What is the speed o
A student adds 6.90 of a 0.380 solution to the beaker. How much will the pH change? The of acetic acid is 4.760.
A 2.0-m-long, 500g rope pulls a 10kg block of ice across a horizontal, frictionless surface. The block accelerates at 2.0m/s^2. How much force pulls on the block of ice and how much force pulls on t
A buffer is prepared by mixing mL of .452 M HCl and .500 L of .400 M sodium acetatae. How many grams of KOH must be added to .500 L of the buffer to change the pH by .175 units.
A 1.70-g sample of a large biomolecule was dissolved in 11.0 g of carbon tetrachloride. The boiling point of this solution was determined to be 77.85°C. Calculate the molar mass of the biomolec
A weak monoprotic acid is exactly neutralized by 11.17mL of a standardized 0.1455M NaOH solution. If the Ka of the acid is 0.00084, what is the pH at the half-equivalence point?
In addition, the snow exerts a retarding force on the sled that points opposite to the direction of motion, and has a magnitude of 57 N. What is the acceleration of the child and sled?
An insulated container holding 4.50 of water at 6.0. Assuming that no heat is lost to the surroundings, what will be the final temperature of the mixture?
when 0.800 grams of NaOH is dissolved in 100.0 grams of water, the temperature of the solution increases from 25.00 degree to 27.06 degree . what is the amount of heat absorbed by the water . ( the
What mass of natural gas {rm{(CH}}_4 ) must you burn to emit 259 kJ of heat?
Write a balanced equation for the reaction of rm Ni(NO_3)_2 and NaOH. Express your answer as a chemical equation. Identify all of the phases in your answer. If there is no reaction, enter noreaction
A salt bridge connects the two beakers, and wires to a voltmeter link the two metal electrodes. Write the equation for the overall cell reaction.
At 20 degrees C, the vapor pressure of ethanol is 45 torr and the vapor pressure of methanol is 92 torr. What is the vapor pressure at 20 degrees C of a solution by mixing 27.0 g of methanol and 75.
The helicopter is moving horizontally to the right at a constant velocity. The weight of the helicopter is W=56500N. The lift force L generated by the rotating blade makes an angle of 21.0 degrees w
A solution of phosphoric acid was made by dissolving 10.0g H2PO4 in 10.0 mL of water. The resulting volume was 104 mL. Calculate density, mole fraction, molarity, and molality of the solution. Assu
What is the pressure in a gas container that is connected to an open end u tube manometer if the pressure of the atmosphere is 742 torr a
Given that the ph for acetic acid is 2.41, the ka=1.8X10-5 and assuming the density of vinegar to be 1.00g/cm3, what is the percent dissociation for acetic acid in vinegar?
Which of the following aqueous solutions will have the lowest osmotic pressure?
What is the freezing point of a solution made by dissolving 352g of ethylene glycol c2h6o2 on 648g of water the freezing point of pure water is 0.0c and kf of pure water is -1.86Cm?
Calculate the amount of heat liberated (in kJ) from 375 g of mercury when it cools from 89.2°C to 15.7°C
When a 7.00-g sample of KCN is dissolved in water in a calorimeter that has a total heat capacity of 2.734 kJ·K-1, the temperature decreases by 0.460 K. Calculate the molar heat of solution