Chemistry Final Exam Study Guide Shara Shonn Chapter 10 – Temperature – the measure of the average kinetic energy of the molecules or atoms in a system * The higher the kinetic energy the higher the temperature Vaporization – * Vaporization – the process by which a liquid or solid changes to a gas * Occurs when particles have enough energy to escape intermolecular forces Evaporation – * Evaporation – the process by which particles escape from the surface of a non-boiling liquid
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Solve the ff. 1. A sample of He occupies 520 mL at 950 Torr and 25°C. If the sample is transferred to a 1.1-L flask at 25°C‚ what will be the gas pressure in the flask? 2. A balloon has temperature of 28°C. What will be the final temperature of the gas if the volume is reduced to half of the original under isobaric condition? 3. Calculate the volume occupied by 4.23 kg of methane gas at STP. 4. Dry ice is useful in maintaining frozen foods because it vaporizes to CO2 (g) rather than melting
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gas sample was held constant‚ its volume varied inversely with its pressure. The Kelvin scale is known as the absolute scale. Charles’ law states that volume of a given mass varies directly with its absolute temperature if the pressure remains constant. Ideal gases are those whose behavior is exactly described by Boyle’s and Charles’ laws. Avagadro’s principle says that the volume of a gas sample at a given temperature and pressure is proportional to the mass or number of moles of the gas. 2
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Forces What Is a Force? Forces represent the interaction of distinguishable objects. Specific forces: The weight W with magnitude W = m * g acts near Earth’s surface with g the gravitational acceleration. (m= mass) The normal force N is due to contact with a surface. It is directed perpendicular to the surface. The tension T is due to a taut‚ massless string. It is directed along the string. The external contact force Fext acts along the direction of the push. Unit: Force and force
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techniques can damage the skin. Identify a range of interventions that can reduce the risk of skin breakdown and pressure sores. Describe the changes to an individual skin conditions that should be reported. It is important to avoid or prevent the vulnerable areas or where sores has already formed. Regularly changing position or moving helps to prevent pressure sores developing in a vulnerable areas or to relieve already existing ones. In every clients risk assessment notes it
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system‚ it contains medical support for workers and family members‚ psychological therapy such as stress reduced workshop and child care service that workers’ children are being look after while they are at work. The above strategies can relief the pressure of employees because their families are being covered. Second‚ I would like to talk about how family-friendly policies benefit families. Employees can obtain a balance between their work and family responsibilities. They can spend more time on
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SUBLIMATION Sublimation is a technique used by chemists to purify compounds. Typically a solid is placed in a vessel which is then heated under vacuum. Under this reduced pressure the solid volatilizes and condenses as a purified compound on a cooled surface‚ leaving the non-volatile impurities behind. This cooled surface often takes the form of a "cold finger" (shown in the diagram above). Once heating ceases and the vacuum is released‚ the sublimed compound can be collected from the cooled surface
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s f s f s f sdgfsdf sdf s d g sdf d d f f d sdddddddddd f gf d f ff f f s d gs df sdfgwsgsd gfsdfljkljgs sjgfskjflskjgsl sjflskjsjg skgsjjljdf s jskjljlsjlkjs sjfkjsdflgsenters the boiler at a pressure of 18 MPa‚ and saturated vapor enters the turbine. The condenser pressure is 6 kPa. Determine (a) the thermal efficiency. (b) the back work ratio. (c) the net work of the cycle per unit mass of water flowing‚ in kJ/kg. (d) the heat transfer from the working fluid passing through
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Falls from Society At one point in life‚ everyone must face the realities of societal pressure‚ sometimes leading to atrocious experiences. The reality of societal pressures is the borderline of innocence‚ of which a child has. Teddy‚ being the child‚ has been forced to cross that borderline prematurely by his guardians. In Nowlan’s‚ The Fall of the City‚ symbolism and characters assist in proving that societal pressure exists and remains to be the reason for one’s downfall‚ much like Teddy. Firstly
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Other backers of parental responsibility laws‚ like Oregon state representative (D) Mike Lehman has gone on record to say “"If you are going to lock kids up for serious crimes‚ then parents should be held responsible." (Portner) The notion that lawmakers like Rep. Lehman wants to lock up child and parent is absolutely absurd. As if that parent doesn’t have enough to worry about as their child faces incarceration‚ they will have to also worry about their own sentence. This notion frightens many parents
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