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5g of NaOH and NaCL ( as impurity) were dissolved in 1dm3 of water. If 25cm3 of this solution were neutralized by 21cm3 of 0.1moldm3 HCL. Calculate the mass concentration of NaOH in gdm3.
At 30.0 K, a container has an unknown pressure. What is the new temperature if the pressure is decreased to 33% of the original?
determine the equilibrium price and quantity supplied if the market supply of an industry is given by p=2qs+4 and the market demand curve is Qd= 28-1/4p
1. Write the hydrolysis reaction for pyridine. identify and define the Bronsted-Lowry acid and base.
2. Why is water considered a Bronsted-Lowry base in the reaction between water and HCI?
3.Define pH and explain how it is related to pOH.
4. The measured pH of the H2SO4 solution in water is 1.8. Calculate the volume of water needed to add to 1.00 L of this solution to increase the pH to 2.55 (The pH scale problem)
5. Determine the concentrations of the hydronium ion in pure water at 50 C if the ion-product of water at 50 C is 3.0x 10^13 ( the acid base properties of water problem )
50 ml of an alkaline water sample requires 3.7 ml of 0.02 N HCL upto phenolphthalein end point and 4.8 ml of complete Neutralization. Find the type and amount of alkalinity in water sample.
7. An aeroplane heads due north at 500 km/h. It experiences a 80 km/h crosswind flowing in
the direction N60oE.
(a) Find the true velocity of the aeroplane. (7)
(b) Determine the speed of the aeroplane. (Leave your answer in terms of square root
6. Four forces act on an object such that the object is at rest. Three of the forces are given by
F1 = 2i −2j, F2 = i −4j, F4 = −3i −5j. Determine F3 and its magnitude
5. Water is flowing downhill at 15.0m/s through a pipe that is at an angle of 75o with the horizontal. What are the components of its velocity?
3. Use De Moivre’s Theorem to determine the cube root of Z and leave your answer in polar
form with the angle in radians
(a) Z = 1+i√3
3. Let Z = i
(i) Write Z in a polar form (2)
(ii) Use De Moivre’s Theorem to determine Z4
#340153 on Dec 2023