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What is the concentration of hydroxide ion in a solution whose concentration of hydro-gen ion is 1.25 ×10-5 M? Would the solution be acidic or basic? explain.
A kid fires water horizontally from a squirt gun held 1.4 above the ground. It hits another kid 2.3 away square in the back, at a point 0.85 above the ground. What was the initial speed of the water
An electric dipole consists of charges +2e and -2e separated by 0.65 nm. It is in an electric field of strength 3.10 x 106 N/C. Calculate the magnitude of the torque on the dipole when the dipole mome
If titrating 0.1461 g of dl-mandelic acid with 0.05 M sodium hydroxide solution, what would the titration curve look like? Mark end point and half titration point.
If the initial velocity of the ball is horizontal, what minimum magnitude must it have if the ball is to clear the net?
If a chemical reaction, A + B --> C + D, is endothermic, what is the sign of ΔH for the reaction? Would the temperature recorded in the calorimeter well for such a reaction increase or dec
If the torque required to loosen a nut that is holding a flat tire in place on a car has a magnitude of 43.0 N·m, what minimum force must be exerted by the mechanic at the end of a 32.0 cm lu
How do you write the molecular & net ionic equation for thereaction that occurs when aqueous solutions of lead acetate(PB(C2H3O2)2) &calcium chloride (CaCl2) are combined?
A disk is rotating about its central axis like a merry-go-round. The angular position delta(t) of a reference line one the disk is given by delta(t)=-3.4 + 2.3t - .43t^2 with t in seconds, delta in
Calculate the magnitude of the electric field for a conducting sphere at a point 3.20 cm away from the center of the sphere.
Salinity is defined by ocenaographers asfollows: mass of dissolved salts/ mass of solution x 1000 suggest asimple way to determine the salinity of seawater sample in the laboratory.
Explain why the acetylation requires one mole of aceticanhydride per mole of phenetidine, despite the fact that aceticanhydride contains two acetyl groups. How is the by-productcontaining the second
An attacker at the base of a castle wall 3.70 m high throws a rock straight up with a speed 8.30 m/s from a height of 1.68 m above the ground. a) Will the rock reach the top of the wall?
Calculate (a) the average velocity (in cm/s) during the time interval t = 2.00 s to t = 3.00 s; (b) the instantaneous velocity at t = 2.00 s; (c) the instantaneous velocity at t = 3.00 s; (d) the in
For the thermal decomposition of nitrous oxide,2N2(g) -> 2N2(g) + O2(g),values of the parameters in the arrhenius equation areA=4.2x109s-1 and Ea=222 KJ/mol.
Andy (mass 80 Kg) uses a 3.0 m long rope to pull Bob ( mass 60 kg) across the floor (µk=0.20) at a constant speed of 1.0 m/s. Bob signals Andy to stop by "plucking" the rope, sending a wave pu
Find the maximum height (y max) reached by the rocket. Ignore air resistance and assume a constant acceleration due to gravity equal to 9.80m/s^2
Determine, the potential along the x axis at x = 0.769 m between wire and sheet.
A monkey swings on a vine and at the bottom of the swing while moving horizontally lets go of the vine aiming for another vine 23.4 meters away horizontally and the other vine is 10.2 meters above t
Height of the helicopter above ground given by h=2.90t^3. At t=1.90s the helicopter releases a bag. How long does it take for the bag to reach the ground?
A test charge of 3.10 µC is placed 6.10 cm away from a large flat uniformly charged nonconducting surface. The force on the charge is 290 N. The charge is now moved to 4.10 cm away from the su
Suppose you want to do a physiological experiment that calls for apH 6.5 buffer. You find that the organism with which you areworking is not sensitive to the weak acid H2X(Ka1=2 x 10-2 and Ka2=5.0 x
Does a chemical reaction occur when a metal ion is placed in a flame and a color occurs? Explain. What is the difference between emission and absorption in spectroscopy?
A hydraulic lift system can hold up t o 400,000 N (80,000 lbs). The maximum pressure in the system is 8,000,000 Pa (1200 psi). what is the minimum cross section area of the piston used to lift the t
In a test tube containing a precipitate ofPb(OH)2 in water, will the ions from the salt havea reasonable concentration? Explain.