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Tutor profile: Matthew R.

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Matthew R.
Masters Student of Clinical Pharmacology
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Questions

Subject: Applied Mathematics

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Question:

You are to run an organ bath with 0.5M of Sodium Chloride salt, calculate, in grams, how much salt you would need in order to create 0.6L of organ bath solution. (M = Moles per Litre, Moles = weight in grams / Molecular Weight (MW), MW of Chlorine = 35.5, MW of Sodium = 23)

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Matthew R.
Answer:

To create 0.5M of NaCl in 1L; 0.5M = x / (35.5+23) 1M = 2x / 58.5 58.5 = 2x x = 29.25 So for 1L 29.25g is required, therefore for 0.6L 29.25 * 0.6 = 17.55 17.55g of NaCl is required for 0.6L of a 0.5M solution.

Subject: Chemistry

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Question:

Describe and explain why using Chloro-Fluoro-Carbons (CFCs) is bad for the environment.

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Matthew R.
Answer:

CFCs are compounds containing Chloringe, Fluorine and Carbon. The were commonly used as refrigeration agents before being banned due to their effect on the ozone layer. The Ozone layer protects the earth and lower atmosphere from harmul UV radiation. The CFCs, once released, would travel to the upper part of the atmosphere where they would interact with UV light from the sun. The UV light would separate the Chlorine from the CFC forming a Chlorine free radical. This Chlorine would bind to two Ozone (O3) molecules and form an unstable intermediate which would break down to form three standard ozygen molecules (O2) and reform the free radical. This would be a self replicating process which could rapidly deplete the Ozone layer and expose the earth to harmful amounts of radiation.

Subject: Biology

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Question:

Describe and explain two components of an animal cell's organelle system.

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Matthew R.
Answer:

The cell nucleus is a membraned organelle usually located in the centre of the cell. This organelle contains genetic information in the form of DNA which is transcribed in order to produce the various other structures and chemicals found within the cell. The second component is the mitochondria, known as the powerhouse of the cell. This is a double membraned organelle which contains enzymes used for various cellular reactions. One important reaction found within the mitochondrial membrane is respiration, used for producing energy within the cell.

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