a. The Sodium Chloride Lattice Using the actual diameters of the ions Na 1.90 A, CI 3.62 Å, calculate the ratio of the radius of the sodium ion to the radius of the chloride ion. How many chloride ions are in contact with any one sodium ion in this lattice? 3 a. The Sodium Chloride Lattice Using the actual diameters of the ions Na 1.90 A, CI 3.62 Å, calculate the ratio of the radius of the sodium ion to the radius of the chloride ion. How many chloride ions are in contact with any one sodium ion in this lattice? 3

11. For the CH4 molecule, VSEPR Theory states that: a. Hydrogen atoms will cluster together to get as far away as possible from the electron cloud of carbon b. A tetrahedral shape will form, because the electrons of the hydrogen atoms will repel each other, creating the maximum possible amount of space between each hydrogen atom c. A pyramidal shape will form because of a lone pair of electrons on the carbon d. This molecule is impossible 12. For the CH4 molecule, Valence Bond Theory states that: a. Carbon will form sp hybrid orbitals b. Carbon will form sp? hybrid orbitals c. Hydrogen will form sp hybrid orbitals d. pi bonds will form between carbon and hydrogen 13. Which atom or ion could not have the following electron configuration: 1s'2s 2p°3s°3p° а. Ar b. Cl c. S d. p3- 14. A substance is found to be soluble in water, but not conductive in solution. The substance is most likely: a. lonic b. Non-polar covalent c. Polar covalent d. Metallic

Decide how the sketches below would be listed, if they were listed in order of decreasing force between the charges. That is, select "1" beside the sketch with the strongest force between the charges, select "2" beside the sketch with the next strongest force between the charges, and so on. -2 -1 OO 1 (strongest) 2 3 4 (weakest) 1 (strongest) 2 3 4 (weakest) X 1 (strongest) 2 3 4 (weakest) 1 (strongest) 2 3 4 (weakest) ? 000 Ar

It takes  151./kJmol  to break an iodine-iodine single bond. Calculate the maximum wavelength of light for which an iodine-iodine single bond could be broken by absorbing a single photon. Be sure your answer has the correct number of significant digits.

Talk about carbon and boron

1. Put the electron suborbitals into order of energy, with the highest energy at the top and lowest energy at the bottom       2. Which of the following solids is most likely to contain only metallic bonds?

Rank the elements or compounds in the table below in decreasing order of their boiling points. That is, choose 1 next to the substance with the highest boiling point, choose 2 next to the substance with the next highest boiling point, and so on. substance A B U e chemical symbol, chemical formula or Lewis structure Ar Ag H :0: H 1 HIC C-C-H 1 H H H H H HIC CICI H H H - H boiling point (Choose one) (Choose one) (Choose one) (Choose one) X

Given the following information, use the Kapustinskii equation (shown below and included in the additional information sheet I encouraged you to download and have available) to calculate the lattice energy for Cr2S3 in kJ/mol. Ionic radii:  Cr3+  (62 pm),  S2−  (184 pm) d* = 34.5 pm Κ = 1.21 × 105 kJ pm/mol

1. Consider the diatomic molecules ( molecules with 2 atoms ) in this exercise : O2, N2, Cl2, and HCl . Do you think a diatomic molecule can be any shape other than linear ? Explain . because They are only two alems 2. Look at the Lewis structure you drew for SCl2 and CS2 Both of these molecules are made up of three atoms but have different molecular geometries . a . How is the arrangement of electrons around the central atoms different ? Give the number of lone pairs and bonding groups around each central atom Based on your previous answer , explain why SCl2 can't be linear . c . Explain why one molecule is polar and the other is nonpolar

Rank the elements or compounds in the table below in decreasing order of their boiling points. That is, choose 1 next to the substance with the highest boiling point, choose 2 next to the substance with the next highest boiling point, and so on. substance A B C D chemical symbol, chemical formula or Lewis structure H : Cl H Nb Cl5 - N | H : Cl: C : Cl: -D - H · Η Cl I C-H I H boiling point ✓ (Choose one) | (highest) 2 3 4 (lowest) (Choose one) (Choose one) ✓