Recent content by Paulo2014

Homework Statement 20g of Cr2(SO4)3 was used to make up an 800 ml batch of tanning liquor. When the tanning process was complete, a 10ml sample was taken and the chromium remaining in the sample was determined. The chromium in the sample was oxidised to dichromate and then titrated with a...

Lol thanks man. The next part of the question says: A second titration is carried out in which 0.01 mol L NaOH is titrated with 10ml of 0.200 mol L HOBr, a weak acid with a pKa of 8.69. Calculate the initial pH and the pH at the eqivilence point.

A titration in which 0.01 mol L NaOH is added to 10ml of ethanoic acid is carried out. find the pH at the equvilence point

The boiling points of three compounds are: CH3OH, 65C; CH3Cl, –24C; CH3Br, 4C Discuss the relative strengths of the intermolecular forces in liquid samples of these three compounds. what should I include in my discussion?

I'm stuck... Shedz processes two varieties of kiwifruit – green and gold. Constraints on daily packing are as follows: • At most, 2 000 trays can be packed in total. • At most, 1 200 trays of green can be packed. • A minimum of 200 trays of gold need to be packed. • The ratio of the...

Hi I am unsure what I want to do for a career but I really enjoy calculus, statistics, chemistry, biology and physics. Does anyone have any suggestions?

Homework Statement The depth, d, of the tide in a bay is modeled by the formula d=A+Bcos(Ct+D) where A,B,C and D are constants, d is measured in metres and t in hours. The time between successive high tides is 14 hours. The maximum depth of the tide in the bay is 5 m and the minimum depth...

What is the difference between Complex Numbers in polar form as opposed to rectangular form?

Homework Statement Find the range of values of k for which the roots of the equation are not real. Homework Equations y = x2 + (k - 2) x + (k + 3) The Attempt at a Solution I have no idea...

Why do muscle cells have more golgi bodies than, say, cheek cells?

Yes I have read the material. The answer I just got for question 13 was 429 grams. Is that correct?

anyone?

Hello This attachment is a practice paper I am doing. I know how to do everything except for questions 11, 12 and 13 so I would appreciate it if someone could please show me the process for working them out. thanks in advance.

why would I need to multiply everything by 90x(x-3)? I understand about the 1/y- 1/x= 1/90 part but I don't understand anything else...

I don't have a clue what to do next