strontium or barium salt is heated strongly in the Bunsen flame‚ a characteristic flame colour is observed: Na -- yellow Li-- crimson Ca-- brick red Sr-- crimson Ba --green In the flame‚ the ions are reduced to gaseous metal atoms. Compound -------- heat------- atoms The high temperature of the flame excites a valence electron to a higher-energy orbital. The atom then emits energy in the form of (visible) light as the electron falls back into the lower energy orbital (ground state). excited state
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Density (near r.t.) 0.968 g·cm−3 Liquid density atm.p. 0.927 g·cm−3 Melting point 370.944 K‚ 97.794 °C‚ 208.029 °F Boiling point 1156.090 K‚ 882.940 °C‚ 1621.292 °F Critical point (extrapolated) 2573 K‚ 35 MPa Heat of fusion 2.60 kJ·mol−1 Heat of vaporization 97.42 kJ·mol−1 Molar heat capacity 28.230 J·mol−1·K−1 Vapor pressure P (Pa) 1 10 100 1 k 10 k 100 k at T (K) 554 617 697 802 946 1153 Atomic properties Oxidation states 1‚ −1 (strongly basic oxide) Electronegativity
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melting point is 2157oC and its boiling point is 4265oC. Its liquid range is 2108 K. It means the difference between melting point and boiling point. Technetium is solid in the room temperature. It’s density is 11 g/cm-3 at 20oC. Its heat of vaporization is 582.2 kJ/mole and heat capacity of it is 25oC. It is not very reactive. Manganese is more reactive to air than Technetium and it is not reactive with
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Krypton. [Sep 2014] (0.2 atm) 5. Calculate the number of moles of sulfur dioxide gas‚ SO2‚ transported in a 2 L container at s.t.p. (0.089 mole) 6. Water has a vapour pressure of 24 mm Hg at 25 °C and 182 mm Hg at 67 °C. Calculate the heat of vaporization. [Sep 2011] (40.685 kJ mole-1)
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ARTICLE IN PRESS Energy xxx (2010) 1–7 Contents lists available at ScienceDirect Energy journal homepage: www.elsevier.com/locate/energy A highly efficient six-stroke internal combustion engine cycle with water injection for in-cylinder exhaust heat recovery James C. Conklin‚ James P. Szybist* Oak Ridge National Laboratory‚ 2360 Cherahala Blvd‚ Knoxville‚ TN 37932‚ USA a r t i c l e i n f o Article history: Received 9 September 2009 Received in revised form 3 December 2009 Accepted 8 December
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Symbol Value Gas constant (R) Standard pressure Standard temperature Volume of 1 mole of any gas at STP Thermodynamic Constants Heat of fusion of water Heat of vaporization of water H f (water) Hv (water) 334 J/g 2‚260 J/g J for ice‚ 2.02 J for steam‚ g°C g°C J for liquid 4.18 g°C 2.05 Specific heat of water C p (water) Metal Specific Heat J g°C Density (g/cm3) Melting Point (°C) Aluminum Copper Gold Iron Lead Magnesium Mercury Nickel Titanium Zinc 0.897 0
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C A L I F O R N I A S TA N DA R D S T E S T Chemistry Released Test Questions Question Number 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 Correct Answer A A C A B D A A A B A A C D A A C D B D D C A C A C D A D A C A B D A Standard CHIE1.A CHIE1.A CHIE1.C CHIE1.D CHIE1.E CHIE1.F CHIE1.F CHIE1.G CHIE1.K CH1.A CH1.A CH1.A CH1.B CH1.B CH1.C CH1.C CH1
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ice cellars were used as early as 1000 B.C. in China. Early Greeks and Romans also used underground pits to store ice. Ancient people of Egypt and India cooled liquids in porous earthen jars. Ice was produced due to vaporization of water through the wall of these jars‚ radiating heat into the night air. In 18th and 19th centuries‚ natural ice was cut from lakes and ponds in the winter in northern climates and stored underground for use in warmer months. In early 20th century the same method was used
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What quantity of energy as heat is required to vaporize 0.500 mL of mercury at 357®C‚ its normal boiling point? The density of mercury is 13.6 g/mL. 2.0 kJ 16) Figure 12.17 a) if water is placed in a sealed milk carton at 60 degrees Celsius and sealed tightly and allowed
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The differences in the characteristics of states of matter are given in the following table. S. No. | Solid state | Liquid state | Gaseous state | 1. | Definite shape and volume. | No definite shape. Liquids attain the shape of the vessel in which they are kept. | Gases have neither a definite shape nor a definite volume. | 2. | Incompressible | Compressible to a small extent. | Highly compressible | 3. | There is little space between the particles of a solid. | These particles have a greater
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