Juraj O. IB Biology tutor, IB Chemistry tutor, IB Maths tutor, IB Fur...

Juraj O.

Currently unavailable: for regular students

Degree: Biotechnology (Bachelors) - Edinburgh University

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About me

ABOUT ME
Well, I'm a student of biotechnology at the University of Edinburgh who studied IB in Slovakia. I listen to hipsterish music and try to get as much of life as possible. Desire to always try something new, mindful living and attempting to being able to understand each and every one person's point of view, that's more like me. :)

WHY I TUTOR
1) I had my first opportunities to tutor in last two years of high school. It can be quite challenging, yes, but also oh-so rewarding. 
2) I can proudly say that I had one of the best teachers of Biology, who had really awaken in me the desire to learn and with it also the desire to spread the knowledge further. Therefore I believe that by using his methods of teaching, I could inspire more young people myself.
3) I'm a person that rather then settling on one things explores variety of them before choosing. This means that when learning, I prefer to use lots of different sources, making the lessons maybe more lively, but definitely more memorable. (And that's a good thing, right? :) )
4) Lastly, I would like to have a part-time job that is actually close to something I like, and Biology, Chemistry and Mathematics definitely belong to this group!

WHAT CAN YOU EXPECT?
As I said, I like to use different sources, KhanAcademy being one of my favourite. I still have all my notes and books from high school, so interesting articles, concise presentations and good explanatory videos are a norm in my lessons.

Subjects offered

SubjectLevelMy prices
Biology A Level £20 /hr
Chemistry A Level £20 /hr
Maths A Level £20 /hr
Biology GCSE £18 /hr
Chemistry GCSE £18 /hr
Maths GCSE £18 /hr
Biology IB £20 /hr
Chemistry IB £20 /hr
Further Mathematics IB £20 /hr
Maths IB £20 /hr

Qualifications

QualificationLevelGrade
Higher Level ChemistryBaccalaureate7
Higher Level BiologyBaccalaureate6
Higher Level MathematicsBaccalaureate7
Standard Level SlovakBaccalaureate6
Disclosure and Barring Service

CRB/DBS Standard

No

CRB/DBS Enhanced

01/10/2015

Currently unavailable: for regular students

Questions Juraj has answered

Describe the regulation of blood glucose level.

The glucose level is regulated in pancreas by negative feedback loop, which means that when there is too much glucose, it is removed from the blood, and when there's too little, it is released into the blood. When there is too much glucose, beta cells in the islets in the pancreas are activat...

The glucose level is regulated in pancreas by negative feedback loop, which means that when there is too much glucose, it is removed from the blood, and when there's too little, it is released into the blood.

When there is too much glucose, beta cells in the islets in the pancreas are activated and produce hormone insulin. What insilin does is that it minds to receptors on muscles and liver and stimulate the uptake of glucose from blood. The uptaken glucose is then either used in cell respiration (muscles) or stored in a long-term form as a glycogen (liver). Thus the level of glucose decreases to the desired level.

On the other hand, when the glucose level is too low, glucose needs to be replenished in the bloodstream. Low level glucose activates the alpha cells, which produce glucagon and release it into the blood. What glucagon does is that it stimulates breakdown of glycogen stored in the liver and converts it to glucose (reverse of what insulin does in liver). Glucose is released and the glucose level in the blood increases up to the required amount.

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1 year ago

357 views

Hydrogen bromide forms a strong acid when dissolved in water whereas hydrogen fluoride forms a weak acid. Distinguish between the terms strong acid and weak acid. State equations to describe the dissociation of each acid in aqueous solution. [3]

Here, we have to focus on the term strong acid. It is defined as an acid that is dissolved completely in an aqueous solution. We say that the reaction of dissociation of the acid goes to completion, and we write it as HA(aq) -> H+ (aq) + A-(aq). Notice that the arrow points only in one direciti...

Here, we have to focus on the term strong acid. It is defined as an acid that is dissolved completely in an aqueous solution. We say that the reaction of dissociation of the acid goes to completion, and we write it as HA(aq) -> H+(aq) + A-(aq). Notice that the arrow points only in one direcition, and this is because for strong acids, the dissociated form H+ + A- is preferred, therefore the reaction doesn't go the other way.

Based on this knowledge, we can define the the term weak acid, which can be seen as any acid, which is not strong acid. This means that the acid is not completely dissolved in the aqueous solution, but only partially. The reason why I derived the weak acid from the strong is because strong acid has to dissolved completely, but any acid, which dissolves only a tiny bit, or quite a lot but not completely, is considered a weak acid, so the range of the weak acid is much bigger. The equation of dissociation is HA(aq) <–> H+(aq) + A-(aq), because as it is not completely dissolved, the two forms of the acid create an equilibrium, hence the two way arrow.

With this knowledge, we can move on to the question. First notice, that this question is for 3 points, and asks us for one definition and 2 equations, therefore it is sensible to expect that the definition is for one point and so is each equation.

The distinction between strong acid and weak acid is that strong acid is dissolved completely in an aqueous solution, while weak acid is dissolved only partially. (it is safer to involve both terms strong acid and weak acid in the answer to receive the point for it.)

Hydrogen bromide, HBr, is a strong acid, hence it's equation of dissociation is HBr(aq) -> H+(aq) + Br-(aq). Hydrogen flouride, HF, forms a weak acid, therefore the equation is HF(aq) <–> H+(aq) + F-(aq).

Always write also the state of the molecules! Keep in mind that weak acids form equilibri, hence the two way arrow!

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1 year ago

506 views
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