Definitions and MCQs of Ninth Class Chemistry (chemical energetics)

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In sha Allah no mcq will come out of this in the exams...!

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Definitions and MCQs of Ninth Class Chemistry (chemical energetics)

  1. 1. Chapter 10Chemical Energetics(The failure is the result of disobedience offirst parents then teachers and finally ofthe Almighty Allah)
  2. 2.  Definitions1. Thermodynamics: -The study of conversionand conservation of heat and other forms ofenergy is called thermodynamics.2. Thermochemistry: - it deals with themeasurement or calculation of heat absorbed orabandoned in chemical reactions.3. Thermo chemical reactions: - the chemicalreactions which are accompanied by energychanges along with the material changes aregenerally known as thermochemical reactions.4. Exothermic reactions: -the chemical reactionswhich are accompanied by the liberations oremission of energy are called exothermicreactions.5. Endothermic reactions: -the chemicalreactions which are accompanied by theabsorption of energy are called endothermicreactions.6. system: -the collection of matter having certainboundaries is called system7. Surroundings:- the environment of a system orthe thing that affect on a system are included insurroundings.
  3. 3. 8. Heat of formation: - the change of enthalpywhen one gram mole of a substance is formedfrom its elements9. Standard heat of formation: -the change ofenthalpy when one gram mole of a substance isformed from its elements at 25oC and 1 atm iscalled standard heat of formation.10. Enthalpy: -the total heat content of a system iscalled enthalpy..11. Heat of neutralization: - The amount of heatreleased during the neutralization process whenone mole of water is produced by the reaction ofacid and base.
  4. 4.  Multiple Choice Questions1. Thermochemical reactions involve:a) material changes b) energy changesc) both a & b d) heat changes2. EXO means:a) out of or to evolve b) into or to absorbc) outside d) heat3. ∆H negative represents which reaction:a) thermochemical b) exothermicc) endothermic d) chemical4. Formation of water from hydrogen and oxygenproduces energy:a) -286 K.J/mole b) +286 K.J/molec) -393 K.J/mole d) +393 K.J/mole5. ∆H positive represents neutralization:a) true b) false6. Acid Base reaction is called neutralizationreaction:a) true b) false Questions 7 – 12• Select from the terms below:A) endothermic reaction B)exothermic reaction7. photosynthesis
  5. 5. 8. respiration9. decomposition reaction10. bond formation11. combustion12. melting of iceThe Book MCQs13. in an exothermic reaction:a) heat energy is lost b) heat energy is gainedc) both a & b d) N.O.T14. In an exothermic reaction:a) container becomes hotb) container becomes coldc) the temperature of container remains samed) N.O.T15. During an endothermic reaction:a) container becomes coldb) container becomes hotc) the temperature of container remains samed) N.O.T1 C 2 A 3 B4 A 5 B 6 A7 A 8 B 9 A10 B 11 B 12 A13 A 14 A 15 A

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