# robawalsh

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1. ## IA Type I -- Infinite Summation

How do you enter factorials (!) into the TI-84?
2. ## Lab Report pH affecting the rate of a chemical reaction

How does this work? Which/How is a buffer produced in this reaction? I assume CO2 gas can be measured to determine the rate of reaction for each pH solution?
3. ## IA Type II -- Population Trends in China

I'm doing my Maths SL IA Type II - Population trends in China. A logistic function will never reach it's upper bound, it will be an asymptote, continuing to infinity. But does it start at zero? Or does the bottom half of the sigmoid curve continue to infinity too? Thanks
4. ## Discussion What’s in a name?

Linking back to what Desy Glau said, I think this applies to maths, science and literature. In response to Sandwich: If people with Islamic names - like Tahir for example - were called John, and people with names such as John - associated with anglophone countries - were called Tahir, what difference would it make? A name can indeed give a strong pointer as to a person's background, but these connotations could just have easily have been attributed to Tahir or John, or any other combination of letters/sounds. Perhaps this links in with language? You wouldn't expect someone British to be call
5. ## Chemistry HL/SL help

A 1 molar solution is a solution in which 1 mole of a compound is dissolved in a total volume of 1 litre. The molecular weight of ethanol (C2H5OH) is 46, so one gram molecular weight (= 1 mole) is 46g. If you dissolve 46g of ethanol into a volume of 1 litre, you have made a 1M ethanol solution. Hence, dividing the volume by 20 to get 50cm3 would mean that we need 46g/20=2.3g of ethanol to make a 1M solution in a volume of 50cm3. So, place a beaker on the scales and set the scales to zero, then pour pure ethanol in until you have exactly 2.3g. Then top the beaker up with pure water until you ha
6. ## IA Type II -- Population Trends in China

"Comment on how well this model fits the original data." What sorts of comments should I be making here? Is it adequate just to say which points/years don't fit the line and hence are discrepancies in the data? And that the model seems to fit the data closely, more closely than the other model... Is this enough?
7. ## IA - Investigate a property of a homologous series

Hi, Could someone knowledgeable in chemistry IA's check over my 'design' and give me some feedback? Thanks
8. ## Psychology EE - topic idea, advice?

The research I have so far is primarily by Simon Baron-Cohen. I thought I could include a load of studies offering alternative causes of Autism, which should give me a bit to talk about. However, maybe this is diverging away from the question a bit? Alternative/other causes could act as a counter-arguement... I'm mainly looking at the extent to which Autism is an an "extreme male brain", so I could mention some male/female brain differences, linking in testosterone's effect on this.
9. ## Psychology EE - topic idea, advice?

Ah. I was going to focus primarily on Autism, so I'm not sure that's largely relevant. Interesting study, though.
10. ## Psychology EE - topic idea, advice?

Apologies for being stressy
11. ## Psychology EE - topic idea, advice?

Many psychology EEs fall into this 'too biological' trap. Hell, I even did it at first! The thing with a psych EE, is that you have to produce something new. Or basically build and draw your own conclusion from something with very little research. If you're still thinking of doing this topic, I suggest Money et al, and Moir et al. Simon Cohen et al is for Autism.. not sure how you want to link that in. Just do a bit of research. The more you research, the more your topic will form, or change. I changed my EE research question FOUR times, and it turned out okay . You must do research. EDIT: You