CHEM 101 Midterm: CHEM 101 EXAM 3 REVIEW SHEET

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amethystserval28

30 Nov 2016

School

Binghamton University

Department

Chemistry

Course

CHEM 101

Professor

Steven Boyer

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Document Summary

Chem 101 exam 3 review sheet (7. 9 10. 9) 7. 10: evaporation of liquids: evaporation: the process by which molecules escape from the liquid phase to the gas phase, evaporation is a surface phenomenon. Intermingling of components at the particle level is a requirement for homogeneity: the solutes remain uniformly distributed throughout the solution and will not settle out with time, the solute(s) generally can be separated from the solvent by physical. Compounds containing the following ions are soluble with exceptions as noted. Compounds containing the following ions are insoluble with exceptions as noted. 5. 0ml of alcohol dissolved in enough water to give 100ml of solution: mass-volume percent, %(m/v) = [mass of solute(g)/volume of solution(ml)] x 100, a 2. 3%(m/v) solution of any solute contains 2. 3g of solute in each. 100ml of solution: conversion factors obtained from percent. 25g sucrose/100ml solution and 100ml solution/25g sucrose: molarity: the moles of the solute in a solution divided by the liters of solution.

Related Questions

Need help with #7-9,11. Please show work and formulas, units, and constants you used. Thank you!

7. Air is a source of reactants for many chemical reactions. A sample of dry air of total mass 1.00g consists almost entirely of 0.76g of nitrogen gas and 0.24g of oxygen. Calculate the partial pressures of each of these gases when the total pressure is 0.87 atm.

8. The box below contains a visualized mixture of gas A (represented by the black circles) and gas B (represented by the white circles.) If the partial pressure of gas A is 422 Torr, determnie P in the box, in Torr. Hint: it will help to imagine each circle represents one mol of each species.

9. Answer the questions which follow using the Maxwell-Boltzmann distributions plotted below. a) assume we are dealing with two samples of argon gas. Which curved (dotted or dashed) represents the sample of Ar at the higher temperature? Briefly explain you choice. b) Assume we are dealing with a sample of fluorine and a sample of neion, each at the same temperature. Which curved (dotted or dashed) represetns the sample of fluorine? Briefly explain your choice.

11. Calculate the root mean square velocity of water molecules in the vapor above boiling water at 100.0 degrees celsius.

Question 11 pts

Which general statement about gases is NOT correct?

The molecules of a pure gas are distributed evenly throughout the container.

Gases are much less dense than liquids or solids

Molecules in a gas mixture can form layers according to their densities

Gases can be compressed, even to the point of liquefaction

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Question 21 pts

Which example is the greatest pressure?

1.00 atm

101 kPa

760 mm Hg (= 760 torr)

All of the above pressures are equal.

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Question 31 pts

Which example is the greatest pressure?

850 mm Hg (= 850 torr)

1.5 atm

All of the above pressures are equal.

96 kPa

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Question 41 pts

Assuming all other variables are held constant, a graph of which of the following will NOT yield a straight line?

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Question 51 pts

A sealed vessel contains 0.250 mol of oxygen gas. Which of the following will result in a decrease in the pressure of the oxygen gas?

increasing the number of moles of oxygen

increasing the temperature of the vessel

increasing the volume of the vessel

adding some helium to the vessel

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Question 61 pts

According to Charlesâs law, which change will cause the pressure of a gas to double? Pressure and amount of gas are constant.

The temperature decreases from 650 K to 325 K.

The temperature of the sample decreases fromï¿½88 Â°C to 44 Â°C.

The temperature of the sample increases fromï¿½22 Â°C to 44 Â°C.

The temperature of the sample increases fromï¿½250 K to 500 K.

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Question 71 pts

Which set of units for P, V, and T can be used for combined gas law calculations?

torr, L, and Kelvins

tm, g/L, and Kelvins

atm, mL, and degrees Celsius

inches of mercury, g/mL, and degrees Celsius

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Question 81 pts

The vapor pressure of a gas is

the atmospheric pressure at which the boiling point is determined.

the pressure at a Kelvin temperature exactly two times the boiling point.

impossible to determine experimentally without knowing the temperature and volume.

the pressure above a gas sample when evaporation and condensation are balanced.

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Question 91 pts

In a chemistry experiment where CO2 is collected over water, the atmospheric pressure is 755 mm. The partial pressure of water at the temperature in the lab is 24.2 mm. What is the pressure of the CO2?

779 mm

731 mm

More information is needed to answer this question

755 mm

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Question 101 pts

Which statement is NOT true according to the kinetic molecular theory of gases?

Molecules undergo elastic collisions

Molecules move in straight-line paths.

Molecules of different gases have differentï¿½kinetic energies at the same temperature

Molecules occupy a negligible volume.

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