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The populations of Cook Islands and Niue in the South Pacific has been decreasing at an average rate of 2½% per year over the last 5 years. If the combined population was 23400 in 2007 Define all terms clearly. a) General formula for Half-Life, knowing the rate of change: For the given rate of...

Does anyone know how to draw a sketch of the circuit, showing the generator (source), homestead (represented by a resistance), current by symbol I, and the 200 V voltage as VH.

A particular car travels 20000km in a year and operates at a 20% effiency in transforming the chemical energy in fuel into mechanical energy(motion). The car has a fuel consumption of 10L per 100km and its petrol tank holds 50L a. The amount of energy supplied by a full tank of petrol b. the...

A temperature rise of 1.78oC was observed when 1.00*10^-3 mol of propane gas was burnt in a calorimeter. The calibration factor of the calorimeter was previouly determined to be 1250J oC^-1 1. calculate the heat of combustion of propane in kJ mol-1

1. Find the coordinates of P, the point of intersection of the curves y=e^x and y=2+3e^(-x). If these curves cut the y-axis at points A and B respectively, calculate the area bounded by AB and the arcs AP and BP. Give you answer correct 3 decimal places. 2. differentiate f(x)= loge(x) /...

integrate 1. 6/(5-2x) dx 2. 6(1-2x)^-2 dx 3. (4-3x)^-1 dx 4. find y in terms of x for each of the following dy/dx= 1/(2x) and y=2 when x=e^2 Thanks

1. The OCl- ion acts as a base in water according to the equation OCl-(aq) + H2O(l) HOCl(aq) + OH-(aq) When two drops of 5.0 M NaOH are added to an equilibrium mixture of OCl in water at constant temperature what is the effect on equilibrium? 2. Benzoic acid, C6H5COOH, molar mass 122 g mol-1...

1. For pi/2< a < pi with sin a=cos b where 0<b<(pi/2), find a in terms of b 2. For pi/2< a < pi with cos a = -sinb where 0<b<(pi/2), find a in terms of b thanks

Hey, these are questions i had trouble with Solve the following for x, b. log e (5x) - log e (3-2x) +1 c. Log e (x) + log e (3x+1)=1 d. (8e^-x) - e^x =2 Simplify, a. 1+ log10 a - (1/3)log10 b b. log2 x -2log2 y + log2(xy^2) Evaluate, a. log2 square root 2 + log2 1 +2log2 2 Thanks

<H1 class=subject>Systematic name for CH3(CH2)7CH2Cl? how do you find the systematic name for CH3(CH2)7CH2Cl. How do you decide if its an alkane or alkene? </H1>

1. 2S2O4 -2(aq) + H20(l) = S2O3 -2(AQ) + 2HSO3 - (aq) Write the ionic half equations for the oxidation and reductions that occur when sodium dithionite is mixed with water 2. In dry cells commonly used in torches, an electric current is produced from the reaction of zinc metal with MnO2...

How do u find the charges (C, N, O) in Cu(NO3)2? i don't get why (NO3)2 has a charge of 1 And how did you know the charge of Cu was 2+, its a transition metal

1. If you were to do an experiment to graph the effect of various substrate concentrations, would have on reaction rate and concentration of product, how would u describe the graph. (i know it go up and eventually reaches a plateau, but how would you describe this, i don't know what to say, it...

1. The chlorine in a .63g sample of chlorinate pesticide, DDT (C14H9Cl5), is precipitated as silver cloride. What mass of silver chloride is formed? 2.A precipitate of Fe2O3, of mass 1.43g, was obtained by treating a 1.5L sample of bore water. What was the concentration of iron, in molL-1, in...

Okay i'm gonna throw it out there. These are the question i can't do. Some of them r probably really easy but my textbook has no explanation 1. The concentration of sodium hyroxide in waste water from an alumina refinery was found by titrating 20ml aliquots of waste water agaisint .15M...

1. Lawn fertiliser contains nitrogen. A 1.3g sample of lawn fertiliser was weighed and carefully transferred to a 250ml volumetric flask. The weighing bottle was washed with a little de-ionised water and added to the content, until it reached the calibration line. A 20ml aliquot of this...