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CBSE Class 11 (Science) Thermal Properties of Matter & Thermodynamics — practice questions — page 6

Explore 267 free Thermal Properties of Matter & Thermodynamics questions in CBSE Class 11 (Science) Physics. Open each question or exercise to read its content, reference answers and available explanation.

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Thermal Properties of Matter & Thermodynamics questions and exercises with answers

Showing questions 151–180 of 267.

C(graphite) + O2 → CO2 has ΔH = -393.5 kJ and CO + 1/2 O2 → CO2 has -283.0 kJ. Find ΔH for C + 1/2 O2 → CO.Read the answer and worked solution →What happens to ΔrH when a chemical equation is reversed?Read the answer and worked solution →If a reaction is multiplied by 1/2, what happens to its ΔrH?Read the answer and worked solution →Why can ΔH for C(graphite) → CO not be measured directly?Read the answer and worked solution →Combustion of one mole of glucose releases 2802.0 kJ. What is ΔcH for glucose?Read the answer and worked solution →Cooking gas cylinders contain mostly which hydrocarbon?Read the answer and worked solution →What is the nature of combustion reactions in terms of heat?Read the answer and worked solution →Benzene burns with ΔcH = -3267 kJ/mol; ΔfH of CO2 is -393.5 and H2O(l) is -285.83. Find ΔfH of benzene.Read the answer and worked solution →What does the term spontaneous mean in thermodynamics?Read the answer and worked solution →Why is a fall in enthalpy not a complete test of spontaneity?Read the answer and worked solution →Two gases mix by diffusion in an isolated container with ΔH = 0. What drives this?Read the answer and worked solution →Entropy is a measure of what?Read the answer and worked solution →For a given substance, which state has the lowest entropy?Read the answer and worked solution →What happens to the entropy of a substance when its temperature rises?Read the answer and worked solution →Why does the third law apply only to pure crystalline solids?Read the answer and worked solution →What is the Gibbs equation?Read the answer and worked solution →A process is spontaneous when ΔG has what sign?Read the answer and worked solution →What is another name for the Gibbs energy of a reaction?Read the answer and worked solution →In ΔG = ΔH - TΔS, what does TΔS represent?Read the answer and worked solution →A reaction has ΔH positive and ΔS positive. When is it spontaneous?Read the answer and worked solution →For 2Cl(g) → Cl2(g), what are the signs of ΔH and ΔS?Read the answer and worked solution →A reaction has ΔH = -80 kJ and ΔS = -100 J/K at 300 K. What is ΔG?Read the answer and worked solution →What is the Gibbs energy of a system at chemical equilibrium?Read the answer and worked solution →Strongly exothermic reactions generally have an equilibrium constant that is what?Read the answer and worked solution →What does the first law say about the direction of heat flow?Read the answer and worked solution →Which statement denies the possibility of a perfect refrigerator?Read the answer and worked solution →Which statement rules out a heat engine that converts all absorbed heat into work?Read the answer and worked solution →What limit does the Second Law set on a heat engine's efficiency?Read the answer and worked solution →A book on a desk never hops up by cooling the desk. Which law forbids this?Read the answer and worked solution →Irreversibility comes from non-equilibrium states and which other cause?Read the answer and worked solution →

Worked practice questions

C(graphite) + O2 → CO2 has ΔH = -393.5 kJ and CO + 1/2 O2 → CO2 has -283.0 kJ. Find ΔH for C + 1/2 O2 → CO.

  1. +676.5 kJ
  2. -110.5 kJ
  3. +110.5 kJ
  4. -676.5 kJ
Show answer and solution

Correct answer: B. -110.5 kJ

Reverse the CO reaction to +283.0 kJ and add: -393.5 + 283.0 = -110.5 kJ.

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What happens to ΔrH when a chemical equation is reversed?

  1. It is doubled
  2. It is halved
  3. It stays the same
  4. Its sign reverses
Show answer and solution

Correct answer: D. Its sign reverses

The reverse process absorbs the heat the forward one released, so ΔrH changes sign.

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If a reaction is multiplied by 1/2, what happens to its ΔrH?

  1. It is halved
  2. It is doubled
  3. It changes sign
  4. It is unchanged
Show answer and solution

Correct answer: A. It is halved

Enthalpy is an extensive property, so halving the amounts halves the enthalpy change.

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