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When 23.87 g of ammonium phosphate react with 154.3 mL of 2.11 M barium hydroxide and the gaseous product is collected by water displacement, what will the pressure in the 12.6 L container be the temperature is 67.3^oC and the vapor pressure is 18.34 Torr?

The freezing point depression constant for camphor is -39.7^oC/molal, and the normal freezing point is 179oC. A student makes a solution using 576 g of camphor and 89 g of a solute and measures the freezing point of the mixture to be 81.0^oC, what is the molar mass of the solute? (Assume that the solute is a molecular (not ionic) compound).

A 56.9 liter container holds 24.8 g of carbon dioxide at 387K. How many grams of nitrogen could it hold at 200.0K, assuming the same pressure?

What is the density of a solid made of 2.86 g spheres, each with a radius of 18.6 cm, if they are arranged in a body-centered cubic arrangement? Justify your mass with a diagram of the basic cube. (In other words, draw a picture of the body-centered cube and use that diagram to explain how many spheres are in that cube.)

A student obtains 100.0 grams of a mixture of potassium sulfate and sodium sulfate. She reacts it with excess barium nitrate and obtains 144.6 g of BaSO₄. What percentage of the original mixture is potassium sulfate and what percent of the mixture is sodium sulfate?

Draw the Lewis Dot Structure and Valence Bond Orbital Overlap Diagram for selenium trioxide. On the LDS, label the structure and shape on the central atom. Somewhere (on the LDS or VBOOD) be sure to label the angles and hybridization on all central atoms.

What are the 4 quantum numbers? Where do they come from? What are the numerical relationships between them? What does each tell us?

Write out the electron configurations for the following ions and circle any that are stable: Cl⁺⁵, Fe⁺², Pb⁺², Pb⁺⁴

Why does the freezing point go down when a solute is added to water?

Draw the MO diagram for NO (the sigma p is lower in energy than the pip). What is the bond order of the molecule? What does that mean? Is the molecule para- or dia-magnetic? What does that mean?

List three things that will increase the rate of solvation of table salt in water. Explain why each increases the rate. (To do this you will need to describe the process of solvation in general.)

Explain why iodine crystals do not dissolve well in water, but will mix well with carbon tetrachloride. (This will require you to draw some Lewis Dot Structures and to label and explain some intermolecular forces.)

Your little sister has a cup stuck over her mouth. She says (actually using a primitive form of American Sign Language) that she got it stuck by putting it over her mouth and then “sucking” all of the air out of the cup. Why is the cup stuck? How could she get it off and why would that work? When the cup finally comes off, her lips are swollen. Why?

Put the elements on the second row of the periodic table in order of increasing electron affinity. Explain the order (the general trend and any exceptions to the general trend). There are actually two correct answers to the order of elements for this question (exact opposites). Why are there two answers and why are the opposites?

When 23.87 g of oxalic acid react with 154.3 mL of 2.11 M barium hydroxide and the gaseous product is collected by water displacement, what will the pressure in the 12.6 L container be the temperature is 67.3^oC and the vapor pressure is 18.34 Torr?

The freezing point depression constant for camphor is -39.7^oC/molal, and the normal freezing point is 179^oC. A student makes a solution using 1576 g of camphor and 819 g of a solute and measures the freezing point of the mixture to be 64.0^oC, what is the molar mass of the solute? (Assume that the solute is a molecular (not ionic) compound).

A 56.9 liter container holds 24.8 g of carbon dioxide at 387K. How many grams of nitrogen could it hold at 200.0K, assuming the same pressure?

What is the density of a solid made of 2.86 g spheres, each with a radius of 18.6 cm, if they are arranged in a face-centered cubic arrangement? Justify your mass with a diagram of the basic cube. (In other words, draw a picture of the face-centered cube and use that diagram to explain how many spheres are in that cube.)

Draw the Lewis Dot Structure and Valence Bond Orbital Overlap Diagram for oxalate. On the LDS, label the structure and shape on the central atoms. Somewhere (on the LDS or VBOOD) be sure to label the angles and hybridization on all central atoms.

Both de Broglie and Heisenberg contributed important ideas to quantum theory. What were each of their contributions and how did Schrödinger use their work in his atomic theory?

Write out the electron configurations for the following ions and circle any that are stable: Br⁺⁵, Os⁺², Sn⁺², Sn⁺⁴

Why does the vapor pressure go down when a solute is added to water?

Draw the MO diagram for CN^-1 (the π_p orbitals are lower in energy than the σ_p). What is the bond order of the ion? What does that mean? Is the ion para- or dia-magnetic? What does that mean?

What effect does salt have on a slug and why does it have that effect? (Explain the process that is occurring.) What is different about a Sea Slug (a real creature) that allows it to live in the salty ocean?

When water and carbon tetrachloride are mixed they separate into layers. If a aqueous solution of iodine is mixed with carbon tetrachloride the iodine ends up in the carbon tetrachloride layer. Please explain why they form separate layers and why the iodine ends up in the carbon tetrachloride layer.

Suffering from stress, one of the Lower Merion teachers begins to suck his thumb. After several days of vigorous “sucking” he notices that his thumb is bruised. Explain. (Specifically, tell me how he created the “suction” and why/how his thumb became bruised.