1. The rate law for a given reaction is rate = k[NOBr]2. The rate constant is 1.0 x 10-5 1/M∙s, and the initial concentration was 0.100 M. What is the first half-life of this reaction?
A) 0.50 s B) 6.9 x 104 s C) 1.0 x 10-5 s D) 1.0 x 106 s E) None of these
2. The reaction SO2Cl2 SO2 + Cl2 is first order in SO2Cl2. If the concentration of SO2Cl2 after 198 s is 1.47 x 10-2 M and the rate constant is 2.34 x 10-2 s-1, what was the initial concentration of SO2Cl2?
A) 1.40 M B) 1.53 M C) 4.65 M D) 6.33 x 102 M E) 1.47 x 102 M
3. A catalyst
A) Should be included in a rate law B) Increases the number of collisions that go on to product C) Lowers the activation energy of a reaction D) Is consumed in the course of the reaction E) Two of the above are true
In: Chemistry
Julie throws a ball to her friend Sarah. The ball leaves Julie’s hand a distance 1.0 m above the ground with an initial speed of 10 m/s at an angle 30◦ with respect to the horizontal. Sarah catches the ball 1.0 m above the ground.
(a) What is the horizontal component of the ball’s velocity right before Sarah catches it?
(b) What is the vertical component of the ball’s velocity right before Sarah catches it?
(c) What is the time the ball is in the air?
(d) What is the distance between the two girls?
(e) After catching the ball, Sarah throws it back to Julie. However, Sarah throws it too hard so it is over Julie’s head when it reaches Julie’s horizontal position. Assume the ball leaves Sarah’s hand a distance 1.0 m above the ground, reaches a maximum height of 6 m above the ground, and takes 1.115 sec to get directly over Julie’s head. What is the speed of the ball and the angle with the horizontal when it leaves Sarah’s hand?
(f) How high above the ground will the ball be when it gets to Julie?
In: Physics
1. Which of the following statement is correct?
(a) The maximum stable slope in a coarse-grained soil (φ’=
39o, in the
absence of seepage, is half of 39o
(b) Taylor’s method can be used to assess short term slope
stability
(c) A saturated tension crack in the ground can stabilize
slope
(d) The maximum stable slope in a coarse-grained soil (φ’=
39o), in the presence of seepage, is 2 times of
39o
2. Which below situation provides the largest bearing capacity
for soil under a square footing (width 39m) placed 1m deep into the
ground?
(a) When the water table is at the ground surface
(b) When the water table is at the base of the footing
(c) When the water table is at (1+ 39) depth from the ground
surface
(d) When the water table is 39 above the ground surface
3. Which of the following statement is correct for a strip
foundation (Length 39 m) placed on the ground surface?
(a) Shape factor is 1.0+ 39
(b) Depth factor is < 1.0
(c) Shape factor is 1.2
(d) Shape factor is 1.0
In: Civil Engineering
Calculate the mass of nitrogen dissolved at room temperature in an 88.0 L home aquarium. Assume a total pressure of 1.0 atm and a mole fraction for nitrogen of 0.78.
In: Chemistry
how many ml of 1.0 M NaOH should be added to 500 ml 0.1 M acetic acid in order to make a buffer of pH 5.5?
In: Chemistry
1) Calculate the solubility of Cu4(OH)6(SO4) in a basic solution containing 1.0 × 10-6 M OH- . (Ksp= 2.3 × 10-69)
In: Chemistry
Carbon-11 has a half-life of 20. min. A sample has the initial activity of 64 mCi. What is the activity of the sample after 1.0 h?
In: Chemistry
What is the pH of a solution of 1.0 x 10-10 F weak acid? Why don’t I have to tell you which weak acid it is?
In: Chemistry
What volume of H2 gas will be produced at 1.0 atm and 28 degrees Celsius if 10g of Na are mixed with 100g of H2O.The other product of the reaction is NaOH
In: Chemistry
What is the equilibrium constant for the reaction of AgCl(s) with concentrated HCN? The Ksp of AgCl is 1.8 × 10−10 and the Kf of Ag(CN)2− is 1.0 × 1021.
In: Chemistry