Lattice energy for formation of CaC 2 ( s ) is to be determined. Concept introduction: The pictorial representation of formation of ionic solids from its constituent elements is known as Born-Haber cycle. Following are the steps required to draw Born-Haber cycle of any ionic compound: Step 1: Solid metal is converted into gaseous isolated atoms. It takes place by process called sublimation. Step 2: Gaseous molecules are broken down into separate atoms. Energy is supplied to break molecules apart and this is called bond dissociation energy . Step 3: Isolated metal atoms are converted into respective cations with the help of ionization energy. Step 4: Anions are formed from gaseous atoms with the help of electron affinity . Step 5: Ionic compound is formed by the combination of cation and anion. Energy is released in this process.
Lattice energy for formation of CaC 2 ( s ) is to be determined. Concept introduction: The pictorial representation of formation of ionic solids from its constituent elements is known as Born-Haber cycle. Following are the steps required to draw Born-Haber cycle of any ionic compound: Step 1: Solid metal is converted into gaseous isolated atoms. It takes place by process called sublimation. Step 2: Gaseous molecules are broken down into separate atoms. Energy is supplied to break molecules apart and this is called bond dissociation energy . Step 3: Isolated metal atoms are converted into respective cations with the help of ionization energy. Step 4: Anions are formed from gaseous atoms with the help of electron affinity . Step 5: Ionic compound is formed by the combination of cation and anion. Energy is released in this process.
Solution Summary: The author describes the steps required to draw Born-Haber cycle of ionic solids from its constituent elements.
Formula Formula Bond dissociation energy (BDE) is the energy required to break a bond, making it an endothermic process. BDE is calculated for a particular bond and therefore consists of fragments such as radicals since it undergoes homolytic bond cleavage. For the homolysis of a X-Y molecule, the energy of bond dissociation is calculated as the difference in the total enthalpy of formation for the reactants and products. X-Y → X + Y BDE = Δ H f X + Δ H f Y – Δ H f X-Y where, ΔHf is the heat of formation.
Chapter 6, Problem 6.97SP
Interpretation Introduction
Interpretation:
Lattice energy for formation of CaC2(s) is to be determined.
Concept introduction:
The pictorial representation of formation of ionic solids from its constituent elements is known as Born-Haber cycle. Following are the steps required to draw Born-Haber cycle of any ionic compound:
Step 1: Solid metal is converted into gaseous isolated atoms. It takes place by process called sublimation.
Step 2: Gaseous molecules are broken down into separate atoms. Energy is supplied to break molecules apart and this is called bond dissociation energy.
Step 3: Isolated metal atoms are converted into respective cations with the help of ionization energy.
Step 4: Anions are formed from gaseous atoms with the help of electron affinity.
Step 5: Ionic compound is formed by the combination of cation and anion. Energy is released in this process.
b) Certain cyclic compounds are known to be conformationally similar to carbohydrates, although they are not
themselves carbohydrates. One example is Compound C shown below, which could be imagined as adopting
four possible conformations. In reality, however, only one of these is particularly stable. Circle the conformation
you expect to be the most stable, and provide an explanation to justify your choice. For your explanation to be
both convincing and correct, it must contain not only words, but also "cartoon" orbital drawings contrasting the
four structures.
Compound C
Possible conformations (circle one):
Дет
Lab Data
The distance entered is out of the expected range.
Check your calculations and conversion factors.
Verify your distance. Will the gas cloud be closer to the cotton ball with HCI or NH3?
Did you report your data to the correct number of significant figures?
- X
Experimental Set-up
HCI-NH3
NH3-HCI
Longer Tube
Time elapsed (min)
5 (exact)
5 (exact)
Distance between cotton balls (cm)
24.30
24.40
Distance to cloud (cm)
9.70
14.16
Distance traveled by HCI (cm)
9.70
9.80
Distance traveled by NH3 (cm)
14.60
14.50
Diffusion rate of HCI (cm/hr)
116
118
Diffusion rate of NH3 (cm/hr)
175.2
175.2
How to measure distance and calculate rate
For the titration of a divalent metal ion (M2+) with EDTA, the stoichiometry of the reaction is typically:
1:1 (one mole of EDTA per mole of metal ion)
2:1 (two moles of EDTA per mole of metal ion)
1:2 (one mole of EDTA per two moles of metal ion)
None of the above