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10) Define heat. A) the flow of energy caused by a chemical reaction B) the flow of energy
caused by a temperature difference C) the result of a force acting through a distance D) the
capacity to do work E) a chemical reaction 11) Energy that is associated with the relative
positions of electrons and nuclei in atoms and molecules is called A) kinetic energy C) potential
energy B) thermal energy D) chemical energy 12) Which of the following signs on q and w
represent a system that is doing work on the surround ings, as well as gaining heat from the
surroundings? E) None of these. 13) An endothermic reaction has A) a negative ??, absorbs heat
from the surroundings, and feels cold to the touch. B) a positive ??, gives off heat to the
surroundings,and feels warm to the, touch. C) a negative ??, gives off heat to the surroundings,
and feels warm to the touch. D) a positive ??, absorbs heat from the surroundings, and feels cold
to the touch. E) a positive ??, absorbs heat from the surroundings, and feels warm to the touch.
14) Given w 0, an endothermic reaction has the following. A) +?? and-AE C) +?11 and +?? B) -
AH and +AE D) -AH and-AE 15) Use the standard reaction enthalpies given below to determine
AH rxn for the following reaction: 2NO(g) + O2(g) . 2NO2(g) ??"nn" ? Given: N2(g) +
O2(g)?2NO(g) ?Horxn= +183 kJ A)-150. kJ D) +115 kJ 16) Give the molecular geometry and
number of electron groups for SF4 A) square planar, 6 electron groups C) T-shaped, 5 electron
groups E) seesaw, 5 electron groups B)-117 kJ E) +238 kJ C) -333 kJ B) square pyramidal, 6
electron groups D) octahedral, 6 electron groups
Solution
10) heat is the energy that is caused by temperature difference .
11) kinetic energy refers to the position of electron from the nucleus
12) heat gaining from surrounding is positive (+)
Work done by the system is (-) . So option (a) is correct
13) endothermic reaction is positive delta H and absorbs heat from the surrounding and also feels
cold in touch. Option-D
14) work is zero. So , dH = dE
On one question should be answered according to Chegg rules .pls post other questions
separately
10) Define heat- A) the flow of energy caused by a chemical reaction B.docx

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10) Define heat- A) the flow of energy caused by a chemical reaction B.docx

  • 1. 10) Define heat. A) the flow of energy caused by a chemical reaction B) the flow of energy caused by a temperature difference C) the result of a force acting through a distance D) the capacity to do work E) a chemical reaction 11) Energy that is associated with the relative positions of electrons and nuclei in atoms and molecules is called A) kinetic energy C) potential energy B) thermal energy D) chemical energy 12) Which of the following signs on q and w represent a system that is doing work on the surround ings, as well as gaining heat from the surroundings? E) None of these. 13) An endothermic reaction has A) a negative ??, absorbs heat from the surroundings, and feels cold to the touch. B) a positive ??, gives off heat to the surroundings,and feels warm to the, touch. C) a negative ??, gives off heat to the surroundings, and feels warm to the touch. D) a positive ??, absorbs heat from the surroundings, and feels cold to the touch. E) a positive ??, absorbs heat from the surroundings, and feels warm to the touch. 14) Given w 0, an endothermic reaction has the following. A) +?? and-AE C) +?11 and +?? B) - AH and +AE D) -AH and-AE 15) Use the standard reaction enthalpies given below to determine AH rxn for the following reaction: 2NO(g) + O2(g) . 2NO2(g) ??"nn" ? Given: N2(g) + O2(g)?2NO(g) ?Horxn= +183 kJ A)-150. kJ D) +115 kJ 16) Give the molecular geometry and number of electron groups for SF4 A) square planar, 6 electron groups C) T-shaped, 5 electron groups E) seesaw, 5 electron groups B)-117 kJ E) +238 kJ C) -333 kJ B) square pyramidal, 6 electron groups D) octahedral, 6 electron groups Solution 10) heat is the energy that is caused by temperature difference . 11) kinetic energy refers to the position of electron from the nucleus 12) heat gaining from surrounding is positive (+) Work done by the system is (-) . So option (a) is correct 13) endothermic reaction is positive delta H and absorbs heat from the surrounding and also feels cold in touch. Option-D 14) work is zero. So , dH = dE On one question should be answered according to Chegg rules .pls post other questions separately