Weather Service assign to this storm? A.Category Two B.Category Three C.Category Four D.Category Five Answer Key: C Question 2 of 25 4.0 Points What is the relative humidity when the air temperature is 75 degrees Fahrenheit and the Wet Bulb temperature is 65 degrees Fahrenheit? A.40 percent B.50 percent C.60 percent D.70 percent Answer Key: C Question 3 of 25 4.0 Points An unknown force pushes a 17 kilogram block across a smooth (frictionless)
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the solution‚ regardless of what kinds of particles are present the greater the concentration of any solute‚ the lower the freezing point and the higher the boiling point of a solution. FREEZING POINT LOWERING A liquid begins to freeze when temperature is lowered to the substance’s freezing point and the first few molecules cluster together into a crystal lattice to form a tiny quantity of solid. As long as both solid and liquid phases are present at the freezing point‚ the rate of crystallization
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The Enthalpy Change of the Decomposition of Calcium Carbonate _INTRODUCTION_ RESEARCH QUESTION: What is the enthalpy change of the decomposition of calcium carbonate? BACKGROUND: Enthalpy in chemistry can be thought of as the energy contained within the bonds‚ or the internal energy‚ but it is not heat and you can only measure changes in it. When bond bonds break in the reactants energy is given off‚ when bonds form‚ energy is absorbed. If the energy absorbed is less than the energy released
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and remains constant for a reversible system‚ but never decreases. An air-conditioner functioned by using a working fluid to transfer heat from the colder indoor air to the hotter outside air. So the indoor air will be cooled down to a favorable temperature for indoor activities. Second law of thermodynamics defines as the entropy of an isolated system never decreases due to isolated systems spontaneously evolve towards thermodynamics equilibrium. Air conditioners apply it during its function. Air
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underneath a test-tube filled with water. The temperature rise gave an estimate of the energy released per gram. HYPOTHESIS If the weight of the food product is lighter then the temperature rise is greater and the energy content of the food product is higher. VARIABLES Independent Variable: Heat energy released by the food product. Dependent Variable: Temperature rise of the water. Controlled Variable: Amount of water. RESULTS After measuring the temperature rise‚ the energy released per gram was
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system is reduced (equivalent to an increase in pressure) then the equilibrium position shifts to increase the volume (equivalent to a decrease in pressure) * If the temperature of an endothermic equilibrium system is increased‚ the equilibrium position shifts to use up the heat by producing more products. * If the temperature of an exothermic equilibrium system is increased‚ the equilibrium position shifts to use up the heat by producing more reactants. III. Materials: Reagents:
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Enzyme Activity Dependent Variable amount of product (glucose and fructose) produced Independent Variable pH Controlled Variables temperature‚ amount of substrate (sucrose) present‚ sucrase + sucrose incubation time Effect of Temperature on Enzyme Activity Dependent Variable amount of product (glucose and fructose) produced Independent Variable temperature Controlled Variables pH‚ amount of substrate (sucrose) present‚ sucrase + sucrose incubation time Effect of Substrate Concentration
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OBJECTIVE: - To determine the efficiency of the solar ray collector under various experimental conditions. 1. Illumination with halogen lamp. Water temperature θe≈ 20°C. a) Complete collector b) Collector without glass plate 2. Illumination with halogen lamp. Water temperature θe ≈60°C. c) Complete collector d) Complete collector‚ cold jet of air impinges e) Collector without glass plate f) Collector without glass plate‚ cold jet of air impinges
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up of kinetic energy. It takes more energy to make large molecules vibrate than it does to make smaller molecules vibrate. Thus‚ sound will travel at a slower rate in the denser object if they have the same elastic properties. Temperature - Molecules at higher temperatures have more energy‚ thus they can vibrate faster. Since the molecules vibrate faster‚ sound waves
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In order to obtain the data‚ the DataStudio™ software is set up on the computer to use the temperature sensor on the apparatus to collect steadily the temperatures at specified time interval of 5-seconds. After the computer is completely set-up‚ the rest of the apparatus is collected. Water is added to the calorimeter until it is about 2-inches away from being completely full. In order to lower the temperature of the water‚ a few ice cubes are added. Once the ice is completely melted‚ the calorimeter
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