Exams & Certification

in each rack, pick the compound with the bigger lattice energy. note: lattice energy is always greater than zero. which compound has the bigger lattice energy? NaCl or Na2S KCl or KBr Li2O or BeO The Correct Answer and Explanation is : 1. NaCl vs Na2S: Answer: Na2S Explanation:Lattice energy is directly influenced by the […]

Create the Born-Haber cycle and calculate the lattice energy of lithium oxide (Li₂O) from the following data:QuantityMagnitude (kJ/mol)519603147499-20Ionization energy of Li(g)Electron affinity of O(g) for 2eVaporization energy of Li(s)Bond energy of O2(g)Reaction enthalpy: 2 Li (s) +1/2O2(g) → Li₂O(s)a. -3081 kJ/mold. -2972 kJ/molb. -2586 kJ/mole. -2831 kJ/molc. -2205 kJ/molThe freezing point of ammonia (NH3, 17.04

The standard enthalpy of combustion of butane is -10.93 kcal per gram of butane when the water isproduced in vapor form.a) Convert this value into units of kJ per mole of butane.b) Use this reaction enthalpy to determine the standard enthalpy of formation (Hr) of butane. The Correct Answer and Explanation is : To solve

For this chemical reactionHHH-CI:HHHNOH++CI:HIn the boxes below, draw a molecular level representation of the species present at the beginning, the middle and the end of the reaction. Then in the BLACK boxes below,describe in words what each drawing is trying to depict.Do NOT draw arrows, but instead show how the molecules are interacting. The Correct

Add arrows and missing tetrahedral intermediates in mechanism. O ASP 176 OH Asp 176 N- His 263 H N N H -His263 Tetrahedral Intermediate Ser 152 ‘N 0 Ho Ser152 OAcyl OAcyl Phe77°N – 0 Phe77 N-H H R -N-R Leu 153 R H R H -N-R Leu 153 Asp 176 Asp 176 H H

The following table provides data on output per worker, physical capital per worker, and human capital per worker, all relative to the United States. For each of the three countries listed, calculate factor accumulation and productivity relative to the United States. In which country does factor accumulation play the largest role in explaining income relative

a. Using the TI84, calculate the least squares regression equation. Round the a and b values to four decimal places. ( y=mx+b ) b. Using the TI84, calculate the sum of the squared residuals for the least squares regression equation. Round to four decimal places. c. Using the least squares regression equation ( with a

Give the names of the following polyatomic ions:a) OH-1ionb) CO3-2ionc) PO4-3iond) CN-1ion The Correct Answer and Explanation is : Here are the names of the given polyatomic ions: a) OH⁻ – Hydroxide Ionb) CO₃²⁻ – Carbonate Ionc) PO₄³⁻ – Phosphate Iond) CN⁻ – Cyanide Ion Explanation: Polyatomic ions are ions made up of more than

What are the basic building blocks of nucleic acids? Whatkinds of sugars and bases are found in DNA? In RNA? The Correct Answer and Explanation is : The basic building blocks of nucleic acids are nucleotides, which consist of three components: a nitrogenous base, a sugar molecule, and a phosphate group. Sugars: Nitrogenous Bases: There

The ALU must have two 8-bit bus inputs (labelled A and B) and one 8-bit output as illustrated in Figure 1. The function of the ALU is selected using a three-bit signal F (F2, F1, FO) which select one of eight operations in the ALU as indicated in Table 1. The ALU above is can