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A 0.45mW laser produces a beam of light with a diameter of 1.5mm. What is the average intensity of this beam
Which of the following pairs of substances has the higher chemical potential (?) under the specified conditions? They may be equal. 1.) H2O (s) at -1 degrees Celsius and 1 bar, or H2O (s) at 1 degre
A 2.36 kg mass with an initial velocity of v1 = aˆi, where a = 5.75 m/s collides with, Find the final speed of the composite mass
Calculate the correct volume of sulfuric acid which will need to be added to neutrallize the base. The chemical reaction involves Al(OH)3 and Fe2O3 reacting with KOH and H2SO4 with the end product b
0.150kg stone rests on a frictionless, horizontal surface. A bullet of mass 5.00g , traveling horizontally at 380m/s , Compute the direction of the velocity of the stone after it is struck
To develop muscle tone, a woman lifts a 4.00 kg mass held in her hand. She uses her biceps muscle to flex the lower arm through an angle of 60.0°. How much work does she do
Why do you think the enthalpy of activation, H ‡ , for a syn-periplanar elimination is higher than that for an anti-periplanar elimination
Which of the following has a dipole moment. A) CO2 B) BCl3 C) BrF3 D) more than one of these E) none of these
A 38.0-kg child swings in a swing supported by two chains, each 2.90 m long. The tension in each chain at the lowest point is 418 N. Find the child's speed at the lowest point
The F-Cl-F bond angle between adjacent F's in ClF3 (Cl being the central atom) is closest to
David is driving a steady 21.0m/s when he passes Tina, who is sitting in her car at rest. How far does Tina drive before passing David
A proton is moving toward a wire that carries current in the direction shown. What is the direction of the force on the proton
Which species is amphoteric. 1) HNO3(aq) 2) Cl-(g) 3) CO32-(aq) 4) HSO3-(aq) 5) PO43-(aq)
In the sketch, the small hydraulic piston has a diameter of 2.3cm. how many newtons of force are exerted by the large piston
Santa loses his footing and slides down a frictionless, snowy roof that is tilted at an angle of 30.0â. what is his speed as he leaves the roof
Julie drives 100 mi to Grandmother's house. On the way to Grandmother's, Julie drives half the distance at 35.0mph and half the distance at 73.0mph. What is her average speed on the return trip
If the H+ ion concentration in an aqueous solution at 25.0 °C is measured as 6.6 x 10-4 M, then the pH is 1) 3.00 2) 3.18 3) 6.60 4) 9.55 5) 10.82
the BF3 molecule acts as a Lewis acid, accepting an electron pair from the F- ion to form a coordinate covalent bond. 5) the BF3 molecule acts as a Lewis base, donating an electron pair to the F- io
NH3 can react with BF3, forming NH3¾BF3. In this reaction, 1) NH3 acts as a Brønsted base, accepting a proton from the BF3 molecule. 2) NH3 acts as a Lewis base, donating a proton to t
FInd the definition of cross-linking. How does cross-linking change the properties of a polymers
Which solution should be the most acidic? 1) Zn(NO3)2(aq) 2) Cd(NO3)2(aq) 3) Ga(NO3)3 (aq) 4) Hg(NO3)2(aq) 5) Al(NO3)3(aq)
A 2,200-kg pile driver is used to drive a steel I-beam into the ground. calculate the average force the beam exerts on the pile driver
Given the following substances in order of increasing acid strength,HOCl(aq) < HC2H3O2(aq) < HC2O4-(aq) < HOCN(aq) < HNO2(aq) < HCl(aq) Which species listed below is the weakest base
Dissolving 6.49 g of CaCl2 in enough water to make 306 mL of solution causes the temperature of the solution to increase by 3.44 oC. Assume the specific heat of the solution and density of the solut
An 8.0 kg block is released from rest, v1 = 0 m/s, on a rough incline, which has an angle of 40 from the horizontal. How much work gravity do on the block during this process