How many species are in one unit cell of a body-centered cubic lattice? (A) 9 (B
ID: 529247 • Letter: H
Question
How many species are in one unit cell of a body-centered cubic lattice? (A) 9 (B) 8 (C) 2 (D) 1 Which is most soluble in water? (A) CH_3 F (B) CH_3 OH (C) CH_3 SH (D) CH_3 CH_3 Which is the best molecular-level representation of an aqueous solution of the weak acid HF (aq)? For clarity, water molecules are omitted. When soap is added to water, the soap molecules (A) are solvated by water and dispersed throughout the solution. (B) from micelles with the hydrophilic heads facing inward. (C) from micelles with the hydrophilic tails facing inward. (D) from micelles with the hydrophilic tails facing the hydrophilic heads. What is the most significant intermolecular attraction in a pure sample of CH_3 F? (A) covalent bonding (B) hydrogen bonding (C) dispersion forces (D) dipole-dipole forces the molarity of a hydrochloric acid solution that 26.4% by mass and has a density of 1.19 g mL^-1. 16.4 M (B) 8.62 M 0.124 M (D) 0.116 M According to Henry's Law, which graph accurately represented the effect of pressure of carbon dioxide on the solubility of gaseous carbon dioxide in liquid carbon bertachloride? When a sample of KNO_3(s) spontaneously dissolves in water at room temperature, the solution become quite cold to the touch. For this reaction the enthalpy of solution is ___ and the entropy of solution ___. (A) negative, positive (B) positive, negative (C) positive, positive (D) negative, negative What is the molarity of a solution prepared by dissolving 10.9 grams of KCl(s) in enough water to make 150.0 mL of solution? (A) 72.7 M (B) 0.975 M (C) 0.0727 M (D) 0.00100 M Which occurs to an aqueous the addition of electrolytes? (A) II and III (B) I and III (C) I and II (D) I, II and III What is the equilibrium constant expression for the reaction? C(s) + 2H_2 (g) CH_2 (g) (A) k = [CH_4]/[C][H_2]^2 (B) k = [H_2]^2/[CH_4] (C) k = [C][H_2]^2/[CH_4] (D) k = [CH_4]/[H_2]^2 MgF_2 has K_up = 8.0 times 10^4, What is the solubility of MgF_2 in mol middot L-1? (A) 4.3 times 10^-3 (B) 3.4 times 10^-3 (C) 2.7 times 10^-3 (D) 2.8 times 10^-4Explanation / Answer
10 ) In BCC there is one atom at the center of the the unit cell while there are 8 atoms at the corner. Each corner atom is being shared by 8 atoms respectively. Therefore, each Corner atom contributes 1/8th portion to the unit cell.
No of atoms present in BCC unit cell = (8 x 1/8) + 1 = 2
Correct option is C
11) CH3OH will be most soluble in water due to the formation of Hydrogen bonding with water molecules which is absent in other molecules. Correct option is B.
12) Since HF is a weak acid it will dissociate very less. From the 4 figures first one best represents this case. Out of 4 molecules, only 1 is shown as dissociated. Whereas in other figures dissociation is large indicating the characteristics of a strong acid. Option A is correct.
13) when soap is added to the water, the soap molecules form micelles with the hydrophilic part of the soap molecules pointing outwards and the hydrophobic part groups towards the inside where they are not in contact with water at all. therefore option C is correct.
14) In CH3F due to high electronegativity of F with respect to C a delta negative charge is developed over fluorine atom whereas a delta positive charge is developed over C atom giving rise to dipole moment. Therefore, the most significant intramolecular attraction in a pure sample of CH3F is dipole-dipole forces.
15) Density of the HCL acid solution is = 1.19 g/ mL
Therefore, mass of 1000 ml or 1L of acid solution = 1.19 g/mL x 1000 mL/ L
= 1190 g/ L
Out of this mass of HCL = 0.264 x 1190 g/ L
= 314.16 g /L
Therefore moles of HCl per liter = (314.16 g/ L) / (36.461 g/mole)
= 8.62 mol/ Liter
= 8.62 M
Therefore, correct option is B.
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