2 N2H4(g) + N2O4(g) → 3 N2(g) + 4 H2O(g) When 8.0 g of N2H4 (32 g mol-1) and 92 g of N2O4 (92 g mol-1) are mixed together and react according to the equation above, what is the maximum mass of H2O that can be produced?

The electron cloud of HF is smaller than that of F2, however, HF has a much higher boiling point than F2 has. Which of the following explains how the dispersion-force model of intermolecular attraction does not account for the unusually high boiling point of HF?   Table: Substances and their Normal Boiling Points Substance Normal boiling point HF 293 K F2 85 K

Based on the results of the paper chromatography experiment shown, which of the following can be concluded about the dye? The figure presents two diagrams of a paper chromatography experiment. The left diagram shows a piece of chromatography paper with a dot labeled “Original Position of Dye” near the bottom of the paper. The right diagram is a chromatography chamber with the same piece of chromatography paper partially submerged in a solvent. A dot labeled “Final Position of Dye” is located near the top of the paper. There is a line on the paper above the dot labeled “Solvent Front.”

The diagram above shows the distribution of molecular speed in a sample of gas at two different temperatures, T1 and T2. Which of the following is a correct interpretation of the information provided by the diagram? The figure shows a graph of two curves in a coordinate plane. The horizontal axis is labeled “Molecular Speed,” and the vertical axis is labeled “Fraction of Molecules.” The first curve is labeled T sub 1, and begins at the origin. It moves steeply upward and to the right until it reaches a peak at a point near the top of the vertical axis, about one eighth of the way along the horizontal axis. It then moves steeply downward and to the right until it reaches a point just above the horizontal axis, about one fourth of the way along the axis. From here it moves nearly horizontally to the right until it ends far to the right of the vertical axis. The second curve is labeled T sub 2, and begins at the origin. It moves gradually upward and to the right until it reaches a peak at a point about one third of the way up the vertical axis, and about one half of the way along the horizontal axis and to the right of the peak for the curve labeled T sub 1. It then moves gradually downward and to the right and begins to level off as it approaches the horizontal axis. The curve ends just above the horizontal axis, far to the right of the vertical axis.

The following diagram shows an incomplete Lewis Diagram for an important amino acid used by the body in making proteins. Complete the Lewis Diagram, assuming all atoms have a formal charge of zero. Then answer the following questions about the completed Lewis Diagram. The diagram shows two carbon atoms, two oxygen atoms, five hydrogen atoms, and one nitrogen atom. The two carbon atoms are connected to each other by a single bond; the left carbon atom is marked with the number “1” and the right carbon atom is marked with a number “2”. Carbon 1 is positioned lower relative to carbon 2. Carbon 1 is single bonded up and to the left to an oxygen atom which is single bonded down to the left to a hydrogen atom. There is an unbonded oxygen atom directly below Carbon 1. Carbon 2 has single bonds upward to the right and left to two hydrogens. An unbonded nitrogen atom single bonded to two hydrogen atoms is located below and to the right of Carbon 2, at the same level as Carbon 1.               Identify the orbital hybridization of carbon #1. Identify the molecular and electron geometries around carbon #2. How many pi bonds and how many sigma bonds are in this molecule? How many lone pairs are in this molecule? Answers must be written in the space provided.   Note: If you are unable to show your work adequately using the Rich Text Editor, complete your work on scratch paper. Upload a photo of your work in the “Comments” of this exam immediately after you have completed and submitted the exam. You can access the “Comments” through the grade book. Answers provided on scratch paper alone will not be scored.

The table shows three gases in identical rigid containers under the conditions listed.     Container A Container B Container C Gas Methane Ethane Butane Formula CH4 C2H6 C4H10 Molar Mass (g/mol) 16 30 58 Temperature (°C) 27 27 27 Pressure (atm) 2.0 4.0 2.0   The density of the gas, in g/L, is

Select the choice that best fits this statement: In which of the following species does sulfur have the same oxidation number as it does in H2SO4?

Based on their Lewis diagrams, which of the following pairs of liquids are most soluble in each other?

A student places a sample of a pure metal in a crucible and heats it strongly in air. Data from the experiment are given in the table below. The final mass was determined after the sample was cooled to room temperature. Mass of empty crucible12.0 gMass of crucible and sample before heating14.4 gMass of crucible and sample after heating16.0 g Which of the following statements related to the experiment is correct?

Prepare a data table that shows the results for the analysis of the brass sample using the visual comparison method.