The Entropy of Acetic Acid

From third law measurements, vapor pressures and vapor densities, the entropy of the acetic acid monomer at 25° and one atmosphere is 69.4±1.0 e.u. The value 68.7 is calculated from the vapor phase ethyl acetate equilibrium. For a model based upon acetone and approximately representing free rotation the entropy would be 72.7. If there is only a single potential minimum in the hydroxyl group rotational cycle, the large deficiency below the free rotation value is explained without assuming an exceptionally high potential barrier. A brief discussion of the effect of the number of potential minima and their relative depth is appended, and a possible source of error in third law measurements is suggested.Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/70644/2/JCPSA6-9-12-859-1.pd

The Soap-Bubble Method of Studying the Combustion of Mixtures of Carbon Monoxide and Oxygen

This investigation is a detailed description of the soap-bubble, or constant-pressure, method as applied to the explosive oxidation of carbon monoxide

Some effects of argon and helium upon explosions of carbon monoxide and oxygen

Report presents the results of an investigation conducted to study the effects of the inert gases, argon and helium, upon flame speed and expansion ratio in exploding mixtures of carbon monoxide, oxygen and water.For the particular gas mixtures investigated the results show that: (1) With the possible exception of helium in small amounts the addition of inert gas always produces decreased flame speed and expansion ratio; (2) like volumes of argon and helium have very different effects upon flame speed but practically the same effect upon expansion ratio; and (3) the difference in the effect of these two gases upon speed is independent of the ratio of carbon monoxide to oxygen. A discussion of some possible modes by which inert gases may produce the observed effects is included

The Effect of Water Vapor on Flame Velocity in Equivalent Carbon Monoxide and Oxygen Mixtures

This report presents the results of an investigation to study the effect of water vapor upon the spatial speed of flame in equivalent mixtures of carbon monoxide and oxygen at various total pressures from 100 to 780 mm.hg. These results show that, within this pressure range, an increase in flame speed is produced by increasing the mole fraction of water vapor at least as far as saturation at 25 degrees c., and that the rate of this increase is greater the higher the pressure. It is evident that water vapor plays an important part in the explosive oxidation of carbon monoxide; the need for further experimental evidence as to the nature of its action is indicated

Instructional Design Learners Make Sense of Theory: A Collaborative Autoethnography

Understanding theory is essential to instructional design (ID) research and practice; however, novice designers struggle to make sense of instructional design theory due to its abstract and complex nature, the inconsistent use of theoretical terms and concepts within literature, and the dissociation of theory from practice. While these challenges are generally understood, little is known about the sensemaking process of learners as they encounter these challenges in pursuit of deeper theoretical understanding. Using a collaborative autoethnographic approach, six ID learners investigated their sensemaking experience within an advanced ID theory course. Autoethnography, a form of qualitative research, focuses on self-reflection “to gain an understanding of society through the unique sense of self” (Chang et al., 2013, p. 18). Collaborative autoethnography, a type of autoethnography, explores anecdotal and personal experiences “collectively and cooperatively within a team of researchers” (p. 21). Using individual and collective reflexive and analytic activities, this inquiry illuminates the numerous sensemaking approaches ID learners commonly used to move beyond their initial, basic theoretical understanding, including deconstructing theory, distinguishing terminology, integrating concepts with previous knowledge, and maintaining an openness to multiple perspectives. Additionally, ID learners experienced significant struggles in this process but viewed these struggles as significant and motivating elements of their sensemaking process. Finally, this study offers implications for learners, instructors, and course designers

Flame Speeds and Energy Considerations for Explosions in a Spherical Bomb

Simultaneous measurements were made of the speed of flame and the rise in pressure during explosions of mixtures of carbon monoxide, normal heptane, iso-octane, and benzene in a 10-inch spherical bomb with central ignition. From these records, fundamental properties of the explosive mixtures, which are independent of the apparatus, were computed. The transformation velocity, or speed at which flame advances into and transforms the explosive mixture, increases with both the temperature and the pressure of the unburned gas. The rise in pressure was correlated with the mass of charge inflamed to show the course of the energy developed

George Gissing; his life and work

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Designing a Community of Inquiry in Online Courses

This article describes a practical approach for implementing instructional strategies in order to build a Community of Inquiry (CoI) into an online course. Online community building has positive effects on the quality of student learning, increases student engagement, and encourages motivation of students in online courses. The CoI is a theoretical framework focusing on facilitating meaningful learning experiences through three presences: cognitive presence, social presence, and teaching presence. This article will introduce the CoI framework by way of literature review focusing on CoI instructional strategies. Using Sorensen and Baylen’s (2009) seven principles of good practice, the author will structure CoI instructional activities into presence categories for practitioner use