Senior Science Half-Yearly Revision 1. Surface tension - A property of the surface of a liquid. It is what causes the surface portion of liquid to be attracted to another surface‚ such as that of another portion of liquid. Surface tension is caused by cohesion (the attraction of molecules to like molecules). Since the molecules on the surface of the liquid are not surrounded by like molecules on all sides‚ they are more attracted to their neighbours on the surface. Mercury has a high surface
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Laboratory Techniques & Measurements Observations from Procedures Data Table 1 – Length measurements Object|Length (cm)|Length (mm)| CD|12|120| Key|5|50| Spoon|17|170| Fork|19|190| Metric Ruler|30|300| Data Table 2 – Temperature measurements Hot water from tap (44ºC )|Boiling water (70ºC)|Boiling water – 5 minutes (100ºC)| ]111.2 F|158 F|212 F| Cold water from tap (24ºC)|Ice water (5ºC)|Ice water – 5 minutes (0ºC)| 75.2 F|41 F|32 F| Data Table 3 – Mass measurements
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Thermite Background: Thermite is a powder made from aluminum powder and a metal oxide [usually iron oxide (Fe2O3‚ known as rust)]. The thermite reaction is a redox reaction‚ where Aluminum reduces the oxide of another metal. For example‚ when using iron oxide (as I did) the equation would be Fe2O3(s) + 2 Al(s) -> Al2O3(s) + 2 Fe(l). Black or blue iron oxide (Fe3O4) could also be used. Other examples of possible oxides are manganese thermite (MnO2)‚ Cr2O3‚ and copper thermite (CuO). Aluminum can
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MAE219 Review Prof. Y. Ngabonziza 1. The water in a tank is pressurized by air‚ and the pressure is measured by a multifluid manometer as shown in Figure 1. Determine the gage pressure of air in the tank if h1=0.2m‚ h2=0.3m‚ and h3=0.46m. Take the densities of mercury‚ water‚ and oil are given to be 13‚600‚ 1000‚ and 850 kg/m3‚ respectively. 2. A piston cylinder device initially contains 0.07m3 of nitrogen gas at 130KPa and 120oC. The nitrogen is now expanded
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Nailea Rosales Chemistry THE GAS LAWS LAB LAB 1 Pressure in kPa Volume in ml Dataset 1 30 90 Dataset 2 35 80 Dataset 3 40 75 Dataset 4 45 70 Dataset 5 50 60 Dataset 6 60 50 LAB 2 New temp. in Celsius New Volume in ml Dataset 1 5 47 Dataset 2 10 48 Dataset 3 15 49 Dataset 4 20 50 Dataset 5 25 51 Dataset 6 30 52 1. Describe the relationship that you observed between pressure and volume in this lab. Refer to your data and/or graph to help support your answer. I observed that the higher the pressure
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61. A sample of oxygen of mass 25.0 g is confi ned in a vessel at 0°C and 1000. torr. Then 6.00 g of hydrogen is pumped into the vessel at constant temperature. What will be the fi nal pressure in the vessel (assuming only mixing with no reaction)? 62. A gaseous mixture contains 3.23 g of chloroform‚ CHCl3‚ and 1.22 g of methane‚ CH4. Assuming that both compounds remain as gases‚ what pressure is exerted by the mixture inside a 50.0-mL metal container at 275°C? What pressure is contributed
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Lab 3: Hydrogen Spectrum Abstract When white light is viewed through a diffraction grating‚ we can see each component that makes up the light. However‚ when in an excited state‚ a gaseous element produces bright light of specific wavelengths rather than a continuous spectrum of colors. This phenomenon ultimately lead to the Neils Bohr model of the atom in 1913. Introduction In the middle of the 19th century‚ Robert Bunsen and Gustav Kichoff observed that gases emit spectral lines specific
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Data Analysis: 1. What was the temperature change for the water in the calorimeter (ΔTwater)? 3°C 2. What was the temperature change for the metal sample (ΔTmetal)? Assume the intial temperature of the metal was the same as the temperature of the water it was boiled in. 70°C 3. What was the specific heat of water in J/g°C? 4.186 J/g°C 4. Using the following equation‚ your answers to questions 1-3‚ and your data table‚ determine the specific heat of the metal sample you tested. 5
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Combustion of Alkanols Aim: To determine which alkanols has higher heat combustion Hypothesis: The alkanols with the longer carbon chain will a higher heat combustion Background Information: Heat combustion can be calculated by using various formulas. By using ΔH= -mcΔT‚ we can gather the amount of heat released. Since the experiment is exothermic‚ ΔH will have a negative value. By dividing the total amount by 1000‚ the units changes into KJ. Divide the total KJ of heat by the amount of fuel
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Heat release rate of a subway car on fire in a shrink-scale model Abstract: Heat release rate in a shrink-scale model of a subway car on fire is measured for various aspects of an ignition source and simulated materials differing in material by using shrink scale model. The time is required to reach the value‚ although the maximum Heat Release Rate value is independent of the position of the ignition source. The best method for determining the heat release rate is the maximum Heat Release Rate
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