Diffusion‚ sublimation‚ latent heat of fusion‚ latent heat of vapourisation. 12.Name 3 substances that sublime. 13.Sponge is a compressible material‚ yet it is classified as a solid. Why? 14.What is the boiling and melting point of water in the Kelvin scale. 15.What can dry ice be converted to its gaseous form?
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Some metals react with acids while others do not. In this experiment‚ students will perform 2 reactions: aluminum/zinc with excess 6M hydrochloric acid and aluminum-zinc alloy with excess 6M hydrochloric acid. The purpose of this experiment is to determine the atomic mass of each metal and the percent composition of a known mass aluminum-zinc alloy by determining the moles of H2 gas formed. Zn(s) + 2HCl(aq) → ZnCl2(aq) + H2(g) 1 mole of H2(g) is produced for every 1 mole of Zn(s) 2. 2Al(s)
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amount of an ideal gas kept at a fixed temperature‚ pressure and volume are inversely proportional. Charles Law – The volume of a fixed mass of gas at constant pressure expands by a constant fraction of its volume at 0°C for each Celsius degree or kelvin its temperature is raised. Daltons Law – States that the total pressure of a gas in a container is the sum of the partial pressures of the individual gases in the container. Law of Conservation of Energy - Is that energy cannot be
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determination of activation energy requires kinetic data‚ i.e.‚ the rate constant‚ k‚ of the reaction determined at a variety of temperatures. The student then constructs a graph of ln k on the y-axis and 1/T on the x-axis‚ where T is the temperature in Kelvin. The data points should fall along a straight line‚ the slope of which is equal to (-Ea/R)‚ where R is the ideal gas constant. Iodine-Clock Activation Energy * The plot of (ln k) vs. (1/T) for the iodine clock reaction should reveal a slope
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Through sports many athletes have a connection that is majorly significant in the way that the impact of their experiences can be life-changing. When being apart of a cohesive team‚ specifically football‚ that collectively works hard together to reach a common goal each of the players become aware of the importance of responsibility‚ teamwork and other traits of good character. In that‚ there is an underlying understanding that sports can be influential to young participants by teaching life lessons
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Fashion accessory From Wikipedia‚ the free encyclopedia Jump to: navigation‚ search Burberry-brand handbag A fashion accessory is an item which is used to contribute‚ in a secondary manner‚ to the wearer’s outfit. The term came into use in the 19th century. Accessories are often used to complete an outfit and are chosen to specifically complement the wearer’s look.[1] Fashion accessories are categorized into two areas: those that are carried and those that are worn. Carried accessories include
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org/cgi/content/short/102/25/8838). In this work‚ a custom built cryogenic variable temperature ultra-high vacuum scanning tunneling microscope was utilized for imaging and probing individual organic molecules on silicon. At the cryogenic temperature of 80 Kelvin‚ the precision of these measurements surpassed previous efforts accomplished at room temperature. With this unprecedented data‚ the design constraints for silicon-based molecular electronic devices have been refined‚ Hersam said. In an interesting
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Dear Kelvin‚ How are you? Thank you for your letter last week. How’s your school life? My school is collecting opinions about the green initiatives recently. My school has established facilities for a green campus‚ for example‚ the Environmental Trail‚ Science and Sustainable Development Resource Centre‚ in order to promote sustainable development. Also‚ air-conditioners are replaced by energy-saving and environmentally-friendly air conditioning system. However‚ each student in my school is
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materials at those temperatures. A person who studies elements under extremely cold temperature is called a cryogenicist. Rather than the relative temperature scales of Celsius and Fahrenheit‚ cryogenicists use the absolute temperature scales. These are Kelvin (SI units) or Rankin scale (Imperial & US units). Sea Water From about July 1944 to about September 1944‚ experiments were conducted at the Dachau concentration camp to study various methods of making sea water drinkable. At one point‚ a
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together‚ when forced together their nuclei fuse and then break apart to form a helium nucleus and an uncharged neutron. Most of the excess energy is contained in the free neutron. Fusion occurs at a very high temperature (greater than 100 million Kelvin). At this temperature the deuterium and tritium gas mixture becomes a plasma. The problem with creating fusion is controlling the plasma. One way of controlling the plasma is by using powerful magnetic fields‚ scientists are working on a machine called
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