30‚ 2012 1. Title: Laboratory Techniques and Measurements 2. Purpose: The purpose of this lab is to learn laboratory techniques and to how to measure precisely. During this lab I will learn how to measure length‚ temperatures‚ volume‚ density‚ and mass using laboratory equipment. I will be using laboratory equipment to prepare dilutions and calculate them while using an algebraic formula. 3. Procedure: In order to perform this lab I needed the following materials: a metric ruler
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Observation Zinc Shot: Silver color‚ some pieces are shiny while the majority is dull. Tear shaped pieces (round at base with pointed top). No odor. Zinc Granular: Silver in color‚ semi shiny‚ flaky appearance. No odor. Zinc Sheet: Sheet of metal‚ flat pieces that are about 3 inches wide & 2 inches in length & 0.02 inches in height. Each piece has a dull side and a shiny side. Silver in color‚ the dull side has a darker shade of gray. No odor. Zinc Powder: Gray very fine powder. No odor
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temperature by subtracting the initial temperature of the aluminum from the final temperature of the aluminum. ΔT = Tf - Ti (5 points) Determine the mass of the water by using the water’s density (specific to the initial temperature) and the volume of the water. Remember‚ density = mass/volume. You can look up the density of the water at your specific temperature. (5 points) Use the equation: q = m(SH)ΔT to solve for the amount of heat gained by the water from metal. You have the mass of water from
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Purpose : To demonstrate the principle of buoyancy of warm air. Additional information : The density variation between warm and cool air can be used to explain why warm air possesses higher buoyancy. As hot air contain atoms and molecules with higher kinetic energy than cold air‚ it has a lower density and rises up while the colder air goes downwards. In other words‚ cool air ‘sinks down’ displacing the warm air. Required materials : Balloon
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thealcohol T = ρAl V g - ρE V g =(ρAl - ρE) V g =(ρAl - ρE) * 10E-4 *9.8 converting the volume to m3 Using 2700 for the density of Al and 790 for the density ofethyl alcohol T = 1910 * 10E-4 * 9.8 = 1.87 N A wood block with a density of 700 floats in water. What is the distance from the top of the block to the water if the water is fresh? (a) density of fresh water is ρ_water = 1000 kg/m³ ΣF = 0 - (ρ_wood)g(V_wood) + (ρ_water)g(v_wood) = 0 (v_wood)/(V_wood) = (ρ_wood)/(ρ_water)
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Color: Colorless to light yellow. pH (1% soln/water): 7 [Neutral.] Boiling Point: 201.7°C (395.1°F) Melting Point: 19.7°C (67.5°F) Critical Temperature: Not available. Specific Gravity: 1.03 (Water = 1) Vapor Pressure: 0.1 kPa (@ 20°C) Vapor Density: 4.1 (Air = 1) Volatility: Not available. Odor Threshold: Not available. Water/Oil Dist. Coeff.: Not available. Ionicity (in Water): Not available. Dispersion Properties: See solubility in water‚ methanol‚ diethyl ether. Potential Acute
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Thomas Graham studied the behavior of the diffusion of gases of unequal densities when placed in contact with each other‚ using air as his control. He wanted to numerically prove how the diffusion of the gas volumes was inversely proportional to the value of the density of the gas‚ under constant temperature and pressure. The significance of this experiment was that in led to a reevaluation of the concept of the movement of matter‚ realizing that diffusion dealt with small immeasurable elements
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uniformity of appearance and status of growth. From each of these leaves‚ two epidermal strips were token and on each strip two areas of about 0.25 m2 were selected for determining three stomatal counts in each upper and lower epidermis. For each determination three strips were taken from three different leaves of about the same age‚ ten stomata were chosen at random from each strip‚ and their widths were determined by means of a standardized ocular micrometer. The number of stomata per mm2 (Stomatal
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Aggregate Nominal Maximum Particle Size: 25mm(1in.) SSD Bulk Specific Gravity: 2.53 % Absorption Capacity: 3.47% Dry-Rodded Density: 1.543 g/cm3 Fine Aggregate SSD Bulk Specific Gravity: 2.700 % Absorption Capacity: 3.54% Fineness Modulus: 3.09 1.Determine densities of all materials to be used: ρ = G x ρw Material Specific Gravity x ρ w Density (kg/m3) Water 1 x 1000 1000 Cement 3.15 x 1000 3150 SSD Coarse Aggregate 2.53 x 1000 2530 SSD Fine Aggregate 4
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50mL graduated cylinder 2.6cm Height of 50mL graduated cylinder 9.9cm Water temperature 23 degrees C Initial volume of water in 50mL graduated cylinder 10.2mL Mass of water in the 50mL graduated cylinder (remember‚ 1 g of water weights 1mL since its density is 1 g/mL) 10.2g Volume of water and aluminum shot in 50mL graduated cylinder 18.3mL Mass of aluminum shot (given on outside of packet) 20.07g B. Follow-Up Questions (Show all calculations) Part I (Each question is worth 8 pts.) 1. If two experimenters
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