found on LabPaq site or Google images of a spinal cord smear and label its basic parts using basic labeling boxes provided. Identify the cell body‚ the nucleus‚ the large nucleolus‚ and granular Nissl bodies on the slide. Try to find the axon and differentiate it from the dendrites if possible. Hint: after pasting image‚ right click on it and select “order”‚ “send to back”. cell body nucleus large nucleolus Nissl bodies axon dendrites Now‚ paste an image found on LabPaq site
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by heating/burning a portion of the food item and catching the heat released into a known mass of water in a calorimeter. We will also identify units of measuring heat such as calories and joules. We will use basic lab equipment provided in our labpaq and we will use several household items as well. We will follow all safety requirements and standard procedures for this lab. We learned from the chapter that a “calorie: is a unit of energy‚ just like a kilowatt-hour or a joule. These units
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Experiment 19 Objective: The objective is to become familiar with colligative properties and to use them to determine the molar mass of a substance. Materials and chemicals: 800mL beaker balance weighing paper Thermometer 400mL beaker wire stirrer ring stand unknown solid 15x150mm test tube clamp watch acetone Ice cyclohexane sodium chloride Lab Safety: Wear protective googles‚ apron‚ and gloves. Procedures: Prepare ice/salt/water bath Place 50g of solid NaCl in a 400mL beaker
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experiment is to find the molar mass of an unknown substance by measuring the freezing point depression of a known amount in an aqueous solution. Freezing point depression is a colligative property of solutions. There are three other properties‚ which are boiling point elevation‚ vapor pressure depression‚ and osmotic pressure. Colligative properties of a solution depend on the amount of solute and solvent molecules and not the specific properties of the molecules. The temperature at which the solvent starts
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C. How would you explain a sand recovery percentage that is higher than the original sand percentage? D. What were potential sources of error in this experiment? A.) The methods I proposed were highly similar to the instructions used in the labpaq manual. Just as stated in the instructions‚ I would have used the magnet to separate iron fillings‚ but I would have thought lastly upon
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FACTORS AFFECTING SOLUBILITY There are three main factors that control solubility of a solute. (1) Temperature (2) Nature of solute or solvent (3) Pressure EFFECT OF TEMPERATURE Generally in many cases solubility increases with the rise in temperature and decreases with the fall of temperature but it is not necessary in all cases. However we must follow two behaviours: In endothermic process‚ solubility increases with the increase in temperature and vice versa. For
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colour. Why? [1.0 ] C] Alkali metal halides on heating in presence of alkali metal produce characteristic colours.Give reason [1.0] 2] Colligative properties depend on the number of solute particles in solution [4 marks] A] Give the name of colligative property suitable for the measurement of molar mass of starch[1.0] B] Give reasons for abnormal colligative properties [1.0] C] Represent elevation in boiling point graphically [ 2.0] 3] Cells are used for different purposes [4 marks] A] Differentiate
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the vapor pressure of the liquid equals the pressure surrounding the liquid. At this temperature the liquid phase changes into the gaseous phase (also a colligative property) Melting point is the temperature at which the solid and liquid phases are in equilibrium. At this temperature the solid state changes into a liquid phase (also a colligative property) Specific heat is the amount of energy (in joules or calories) needed to raise the temperature of 1 gram of a pure substance by 1 degree Celsius
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Cyclohexane with the addition of two different concentration of unknown solid. The pure substance of Cyclohexane has defined physical properties. However‚ when a solute is added these properties are determined by the amount of solute added‚ also known as colligative properties. The temperature of the freezing point was lowered when the solid was added and it decreased as the concentration of the solid increased. The molality of the solute was determined‚ which was then used to calculate the molar mass of the
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unknown: 151° - 154° Unknown #26 is Citric Acid All structures look similar by observation and there was no color change in any of the samples. Structural Formula of Citric Acid: QUESTIONS 1. Colligative property depends on the number of molecules‚ not the type of molecule. Another colligative property instead of freezing point depression and boiling point elevation is osmotic pressure. 2. A melting range should always be reported because it tells you if your compound is pure or not. If
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