Comment the following statements (a) The volume coefficient of thermal expansion of water is negative for temperatures in the range 0 to 4 °C. (b) The triple point of water‚ 0.01 °C‚ and 611.73 Pa‚ is one of the primary fixed points on the Kelvin absolute temperature scale. (c) The volume coefficient for the thermal expansion of a solid is twice the linear coefficient for thermal expansion. (d) A temperature of 26.85 °C is the same as 300 K. (e) The surface temperature of the sun (3142 °C) is
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Types of Variables We can distinguish between two types of variables according to the level of measurement: 1. Continuous or Quantitative Variables. 2. Discrete or Qualitative Variables. A quantitative variable is one in which the variates differ in magnitude‚ e.g. income‚ age‚ GNP‚ etc. A qualitative variable is one in which the variates differ in kind rather than in magnitude‚ e.g. marital status‚ gender‚ nationality‚ etc. Continuous or Quantitative Variables Continuous variables can be classified
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The purpose of the following study is to determine where the two unknown bacteria acquired in Microbiology lab should be classified in regards to temperature‚ pH level‚ and osmoregularity. It is important to classify bacteria in order to identify them. Identification of bacteria is important because they are not only useful but potentially dangerous as well. The identification of bacteria can lead to breakthroughs in healthcare regarding treatment of old and new diseases alike. Identifying bacteria
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first substance‚ is equal to the heat gained by the second substance‚ and therefore: Qsubstance 1 = -Qsubstance 2 [2] Since the law of conservation of energy states that energy cannot be created or destroyed‚ the change in energy must equal zero and therefore the left side of this equation must be equal in magnitude but opposite in sign of the right side. By substituting equation [1] into equation [2] we are able to derive: m1 · c1 · Δt1 = - (m2 · c2 · Δt2) [3] and thus we are able
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cells that line the throat with the dangerous chemicals and carcinogens that cigarettes contain. It also causes extreme changes in lung tissue. I do not believe anything could change my view unless they magically proved that smoking had absolutely zero adverse conditions to ones health. 7. Find two friends who have
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of solvent. · Paragraph 2: What could you improve on? (Do you think if someone repeated your lab they would get identical results? Why not? What are some steps you could take to improve the reliability and repeatability of your results?) Point: Although most variables were controlled for‚ the repeatability of this lab could be improved by including the following steps. Make sure the lab is quiet and distraction free at all times. This is important to the experiment because when a scientist
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minutes of being placed under the same heat lamp‚ the soil will absorb heat faster‚ therefore ending with a higher temperature than the water. Materials • 2 petri dishes • Soil • Water • 2 thermometers • Heat lamp Procedure 1. Design lab tables. 2. Record mass of petri dish and then add enough soil to fill it to the brim. Record mass again. The difference is the mass of the soil sample. 3. Record the mass of another petri dish and fill it with water. Record the mass again. The difference
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1. For each of the following‚ indicate which is a variable and which is a constant: a. The number of minutes in an hour. Constant b. Patients’ systolic blood pressure. Variable c. Pi (π) – e.g.‚ for finding the circumference of a circle. Constant d. College students’ level of depression variable 2. For each of the following research questions‚ identify the independent variable IV “and” the dependent variable‚ DV: Does a person’s age affect psychological adjustment following burn
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LM35 Precision Centigrade Temperature Sensors The LM35 series are precision integrated-circuit temperature sensors‚ whose output voltage is linearly proportional to the Celsius (Centigrade) temperature. The LM35 thus has an advantage over linear temperature sensors calibrated in ˚ Kelvin‚ as the user is not required to subtract a large constant voltage from its output to obtain convenient Centigrade scaling. The LM35 does not require any external calibration or trimming
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Effect of Temperature on Peroxidase Ability to Break Down H2O2 By: Rodneika Crutcher Abstract Temperature affects the ability of peroxidase to break down hydrogen peroxide. In this experiment our professor extracted peroxidase from potato tissue. In order to determine how temperature affects peroxidase we created solutions and measured their absorbance levels after water bath treatments. The more absorbent the solution was the less hydrogen peroxide there was in the solution. This means the peroxidase
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