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Chemistry_Honors_sem_2

Chemistry_Honors_sem_2 - Chemistry Honors 2nd Semester Exam...

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Chemistry Honors 2 nd Semester Exam Study Guide Exothermic any process that gives off heat/ heat given off by the system to the surroundings/ solidification, condensation Endothermic heat has to be supplied to the system by the surroundings/ heat absorbed by system from surroundings/ fusion, vaporization q = mC T q= thermal energy; m= mass; C= specific heat capacity ; T= change in temperature Problems Specific heat of liquid water: 4.18 J/g C Specific heat of ice: 2.09 J/ g C Specific heat of vaporized water: 1.84 J/g C 1. When 435J of heat is added to 3.4g of olive oil at 21 ˚ C, the temperature increases to 85 ˚ C. What is the specific heat of the olive oil? 2. How much heat is required to raise the temperature of 250g of mercury 52 ˚ C? 3. What is the specific heat of a substance if 38.5 kJ are required to raise the temperature of 315g of the substance from 39.5 ˚ C to 180 ˚ C?
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specific heat the amount of heat required to raise 1 gram of a substance 1 ˚ C molar heat of fusion the energy required to melt one mole of solid molar hear of vaporization the energy required to melt one mole of liquid molar heat of solidification the heat lost when 1 mole of liquid solidifies molar heat of condensation the amount of heat released when 1 mole of vapor condenses thermochemical equations Problems 1. How much heat will be released if 1g of H 2 O 2 decomposes in a bombardier beetle to produce a steam spray? 2H 2 O 2 2 H 2 O + O 2                 H= -190kJ 2. How much heat is transferred when 9.22g of glucose reacts with oxygen? C 6 H 12 O 6 + 6O 2   6CO 2 + 6H 2 O                      H = -2803kJ 3. How much heat is absorbed if 27.1g of iodine reacts with hydrogen? H 2 + I 2   2HI                                     H= 26.5kJ C = λv C= speed of light, 3x10 8 m/s; λ = wavelength;
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v = frequency (Hz = 1 cycle/s) 10 9 nm=1m Problems 1. A photon has a frequency of 6.0 x 10 4 Hz. Convert this frequency into wavelength (nm). 2. What is the frequency of light having a wavelength of 439 nm? 3. Calculate the wavelength that has a frequency of (a) 102 MHz (b) 27 x 10 15 Hz (c) 220 GHz [1 gigahertz (GHz) = 10 9 Hz E = h x v E = energy; h = 6.63 x 10 -34 ; v = frequency Problems 1. When copper is bombarded with high-energy electrons, X rays are emitted. Calculate the energy (in joules) associated with the photons if the wavelength of the X rays is 0.154 nm.
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