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IB Chemistry 11 - Energetics Worksheet: Enthalpy Changes and Bond Enthalpies, Study notes of Chemistry

University for the Creative Arts (UCA)Chemistry

This worksheet covers various topics related to enthalpy changes and bond enthalpies in ib chemistry. Students are required to calculate specific heat capacities, determine heat energy required for temperature changes, and use bond enthalpies to calculate δh for different reactions. Hess's law is also introduced, requiring students to use given data to calculate δh for a reaction of interest.

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2021/2022

Uploaded on 09/12/2022

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IB Chemistry 11 Energetics WS Name: _____________
Enthalpy Changes
1. It takes 78.2 J to raise the temperature of 45.6 g lead by 13.3°C. Calculate the specific heat capacity of lead.
2. How much heat energy is required to increase the temperature of 10.0 g of nickel (specific heat capacity of
440 J kg-1K-1) from 50.0 °C to 70.0 °C?
3. Copper has a specific heat capacity of 400 J kg-1K-1. If a 50 g cylinder of copper absorbs 800 J of energy,
by how much will its temperature rise?
4. The enthalpy of combustion of ethanol is 1370 kJ mol-1 . How much heat is released when 0.200 moles of
ethanol undergo complete combustion?
pf3

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IB Chemistry 11 Energetics WS Name: _____________ Enthalpy Changes

  1. It takes 78.2 J to raise the temperature of 45.6 g lead by 13.3°C. Calculate the specific heat capacity of lead.
  2. How much heat energy is required to increase the temperature of 10.0 g of nickel (specific heat capacity of 440 J kg-^1 K-^1 ) from 50.0 °C to 70.0 °C?
  3. Copper has a specific heat capacity of 400 J kg-^1 K-^1. If a 50 g cylinder of copper absorbs 800 J of energy, by how much will its temperature rise?
  4. The enthalpy of combustion of ethanol is 1370 kJ mol-^1. How much heat is released when 0.200 moles of ethanol undergo complete combustion?

Bond Enthalpies

  1. Using the bond enthalpies found in the IB Data Booklet Table 10, calculate the ΔH for the following reaction: H 2 C=CH 2 + H 2 à H 3 C-CH 3 (Note: The equation is written to highlight that the carbon to carbon bond goes from a double bond to a single bond.)
  2. Using the bond enthalpies found in the IB Data Booklet Table 10, calculate the ΔH for the following reaction:
  3. Using the bond enthalpies found in the IB Data Booklet Table 10, calculate the ΔH for the complete combustion of methane (CH 4 ). (Hint: Be sure to draw the structures of all of the molecules out, because you need to know where there are single and double bonds!)