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A 5.00 L of a gas is collected at 100. K and then allowed to expand to 20.0 L. What must the new temperature be in order to maintain the same pressure (as required by Charles' Law)?
An aqueous potassium iodate stock solution is made by dissolving 6.33 mol KIO in sufficient water for the final volume of the solution to be 4.80 L.
Calculate the molarity of the stock KIO3 solution.
A 10.0 mL aliquot is removed from the described stock solution and diluted to a total volume of 100.0 mL. Calculate the molarity of the dilute solution.
A chemist places 0.550 g KCl in a flask and adds water until the total volume is 0.900 L. Calculate the molarity of the solution.
What is the concentration in millimolar (mM)?
What is y after the following switch statement is executed? Rewrite the code using an if-else statement.
x = 3; y = 3;
switch (x + 3) {
case 6: y = 1;
default: y += 1;
}
. 2.83 g of a sample of haematite iron ore [iron (III) oxide, Fe2O3] were dissolved in concentrated hydrochloric acid and the solution diluted to 250 cm3. 25.0 cm3 of this solution was reduced with tin(II) chloride (which is oxidised to Sn4+ in the process) to form a solution of iron(II) ions. This solution of iron(II) ions required 26.4 cm3 of a 0.0200 mol/dm3 potassium dichromate(VI) solution for complete oxidation back to iron(III) ions.
(a) given the half–cell reactions
(i) Sn4+(aq) + 2e– ==> Sn2+(aq)
and (ii) Cr2O72–(aq) + 14H+(aq) + 6e– ==> 2Cr3+(aq) + 7H2O(l)
deduce the fully balanced redox equations for the reactions
(i) the reduction of iron(III) ions by tin(II) ions
(ii) the oxidation of iron(II) ions by the dichromate(VI) ion
(b) Calculate the percentage of iron(III) oxide in the ore.
Tyrone and John are playing tug-of-war against Jamie and Bronn. Timer is pulling with a 9 N of force, John is playing with a 17 N force, Jamie is pulling with a 13 N Of force and brown is pulling with a 8 N of force. Draw free body diagram and determine what the net force is and in what direction it is acting?
Write a program to display the days of the week
You are to upload only the .java file
• Do the calculations on Matlab, print it out and then write your answers on the attached answer
sheet.
• Attach your Matlab printout to your answer sheet before you hand in.
1. Find all solutions for each of the following systems of equations (if the system is consistent):
(a) 6.5x − 2y = 7 (b) 3.5x1 + 4.5x2 + 5.5x3 = 11
2x − 0.75y = 1.75 x1 + 4x2 − 7x3 = −16
12x − y = 21 0.5x1 − 0.75x2 + 0.75x3 = 3.5
(c) − 0.75x1 + 0.75x2 = −6 (d) 3.4x1 + 3.4x2 − 15.3x3 = −20.4
2.5x1 + 2x2 − 4.5x3 = 2 0.5x1 + 0.25x2 − 0.75x3 = 1
1.25x1 + 1.25x2 − 2.5x3 = 0 0.75x1 + 0.5x2 − 1.5x3 = 1
Please note: You should use Matlab to write your systems in reduced row echelon form, but have to
interpret the results and give the solution(s) if the system is consistent.
if the base X of the right triangle shown is increasing at the rate of 3 inches per second and the height Y is decreasing at the rate of 2 inches per second, find the rate of change of the area of the triangle when X = 5 inches and Y = 7 inches. Label the units on your answer
Determine the force in each member of the loaded truss. All triangles are isosceles.
#340153 on Dec 2023