UNIVERSITY ENTRANCE EXAMINATION PHYSICS Duration : 2 hours Please read the following instructions carefully. 1. This paper is made up of 50 Multiple-Choice questions and comprises ELEVEN (11) printed pages. 2. Do not write on the question paper. 3. Answer all questions and indicate your answers on the answer sheet provided. Marks will not be deducted for wrong answers. 4. Do not take any paper‚ including the question paper or unused answer sheets‚ out of the examination
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------------------------------------------------- Water and Electrolytes Water constitutes 50-55% of a woman’s body weight and 55-60% of man’s weight. Water gives structure and form to the body‚ helps maintain body temperature‚ and also creates the necessary environment for cell metabolism. There are two compartments of body water‚ extracellular and intracellular fluid. Extracellular fluid (ECF) is water found outside of cells. Making up approximately 20% of total body weight‚ the ECF consists
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Introduction: This experiment was used to examine the hypothesis that: Osmosis is dependent on the concentrations of the substances involved. Diffusion is the passage of solute molecules from an area of high concentration to an area of low concentration (Campbell & Reece‚ 2005). An example is ammonia diffusing throughout a room. A solute is one of two components in a chemical solution. The solute is the substance dissolved in the solution. The solvent‚ the other component‚ is any liquid in
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________________ The electrical conductivity of electrolytes and non-electrolytes activity demonstrated the physical propertiesand the conductivity of some solution. Electrical conductivity apparatusare dipped into a liquid in a beaker. Whenthe liquid contains significant concentrations of ions‚ the ions more between the electrodes to complete the circuit(which includes a light bulb).Tapwater and distilled water are examples of non-electrolytes. A solution of a weakelectrolytes‚ acetic acid (CH3COOH)
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Electrolyte is a scientific term for salts‚ specifically ions. The term electrolyte means that this ion is electrically-charged and moves to either a negative or positive electrode. Ions that move to the negative which are called cations are positively charged and Ions that move to the positive which are called anions are negatively charged. They can be divided into acids‚ bases‚ and salts‚ because they all give ions when dissolved in water. Electrolytes are present in the human body‚ and the balance
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current of 5.00 A. The density of aluminum is 2.70 g/cm3. Assume each aluminum atom supplies one conduction electron per atom. Find the drift speed of the electrons in the wire. 12. A lightbulb has a resistance of 240 when operating with a potential difference of 120 V across it. What is the current in the lightbulb? 13. An electric heater carries a current of 13.5 A when operating at a voltage of 120 V. What is the resistance of the heater? 18. Aluminum and copper wires of equal length are
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Experiment 12: The Effect of Ionic Strength on the solubility of an Electrolyte Aim: The purpose of this experiment was to determine the thermodynamics variable of enthalpy‚ ∆H for the dissolution reaction of boric acid in water. The solubility of boric acid was measured over a range of various temperatures by finding out at what temperature crystallization began for solution of different molarities. A graphical relationship between the natural logarithm of molal concentration and the inverse of
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Osmolality and electrolytes in cerebrospinal fluid and serum of febrile children with and without seizures. During acute febrile diseases mild disturbances of water and electrolyte balance occur frequently. It has been suggested that changes in electrolyte balance‚ in particular hyponatraemia‚ might predispose a child to convulsions during febrile illness; however‚ the changes of electrolytes in the CSF are not known. We have studied the effects of fever and convulsions on water and electrolyte balance
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Fluid and Electrolytes Imbalances Fluid Compartments: * Extracellular Fluid (ECF) – This is fluid found outside of the cells and the amount of ECF decreases with age. In the newborn for example‚ approximately ½ of the body fluid is contained in the ECF. By the time the infant has reached one year old; the ECF has decreased to approximately 1/3 of the total volume. In an average 70 kg adult the ECF is approximately 15 liters of total volume. ECF can further be divided into the following:
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Aim: To investigate the effect to the potato cells in the different solute concentration water Introduction; Water can move through the different cells due to the difference of water potentials in the cells. If there is a higher solute concentration in the cell than outside the cell‚ the water will move into the cell. However‚ if the concentration of inside the cell is lower than the outside‚ water will not move into the cell. This process is called osmosis. Research question; This investigation
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