redfox

Ah, thankyou very much. Did come in handy!

I need to express blood pressure in terms of kPa. The conversion is 1kPa - 7.5mmHg, or .133 kPa - 1mmHg, but how would this be expressed? Just kPa subsituting mmHg, ie kPa/kPa?

Nonono, we didn't ever 'lose' our hair (tho some mens heads prove that wrong) we were created from the beginning without long body hair cos we're not animals!

Depolarisation of the atria leads to a low amplitude ‘P’ wave, which indicates atrial contraction and is displayed as a positive deflection on an ECG monitor. ?

How do I know if a gas plus a gas = solid or gas? Or gas plus solid = gas or solid and so on...?

There is another reason not really emphasised enough here...carbon is very very very stable, the most stable of all elements. If you put it in water it doesn't explode, nor does it combust in air or when it is compressed, etc etc etc. It can have many different chemicals on it and only relatively few will harm it, and usually it will be able to heal itself, if not it can be repaired, in most circumstances, by alternative means. Overall carbon is the super element and should be up on a pedestal! Here's to carbon! *clinks glass*

Ok so I'm having to pick up chemistry after 7 years of having nothing to do with it. I've searched around for tutorials on the different types and how they work, but I'm stuck with a couple of (simple) questions. I need to write a balanced equation for: Bromine gas to monatomic Bromine. I think this is: Br2 -->2Br. I've been told it's enthalpy of hydration...but I'm not sure why that is! Ok, second question is balancing Sodium gas to a sodium (I) cation. What does the (I) mean? Just Na+? Is sodium not Na2+? Obviously I'm missing something here...also I need to state the type of enthalpy. The last question is balancing monatomic bromine to a bromide anion and what kind of enthalpy is it. Answers to any of these will be helpful, but perhaps some sort of explanation of what the different types of enthalpy are or links to a good tutorial site would be great! Ta

Please help if you can. I've read and re-read thru instructions for doing this equation, but I'm still stumped:( At 25 degreesC 0.212g of Barium Hydroxide Ba(OH)2 is dissolved completely in sufficient water to make .25 litres of final solution. I need to find the hydroxide ion and hydrogen ion concentrations. So far I have come up with... molar mass of Ba(OH)2 = 171.02 .212/171.02 = 0.00124 mol/ .25 litre =.00496 mol/ litre so the Hydroxide (OH-) Right? should be .006232 but this is more than the whole amount, so how is it possible? And since Hydrogen ion is supposed to make up the rest of it, it would have to be a negative amount and...well...you see my problem. Is there any hope?