CB

Christina Bauer

Numerade Educator
Professor

Biography

I have been teaching for 12+ years at a variety of institutions. I served as Department Chair for two years and have been promoted with tenure. However, as I move up the professional 'ladder' there is less teaching involved and I miss the every day excitement of working with students and showing them ways to answer questions. I am a physical chemist and can teach chemistry, physics, and math as needed.

Education

Christina has not yet added their education credentials.

Educator Statistics

Numerade tutor for 5 years
48 Students Helped

Topics Covered

Atoms, Molecules, and Ions: Understanding the Building Blocks of Matter
Unlocking the Power of Composition: Tips and Techniques
Understanding Electronic Structure: A Comprehensive Guide
Unlocking the Power of Thermodynamics: A Comprehensive Guide
Exploring the Fascinating World of Thermochemistry | Learn More Today
Unlocking the Secrets of Thermal Properties: Understanding Matter
Understanding the First Law of Thermodynamics: Key Concepts
Understanding the Second Law of Thermodynamics: Key Principles

Christina's Textbook Answer Videos

10:37
Physical Chemistry

Show that the function defined by $\mathrm{d} f(x, y)=\left(y^{2}-x y\right) \mathrm{d} x-x^{2} \mathrm{d} y$ is inexact. Test the integrating factor $1 / x y^{2}$ to see whether it produces an exact differential.

Chapter 2: First Law of Thermodynamics
Christina Bauer
13:38
Physical Chemistry

The isothermal compressibility $\kappa$ of a gas is defined in Problem $1.17,$ and its value for an ideal gas is shown to be $1 / P$ Use implicit differentiation of $V$ with respect to $P$ at constant $T$ to obtain the expression for the isothermal compressibility of a van der Waals gas. Show that in the limit of infinite volume, the value for an ideal gas is obtained.

Chapter 1: Zeroth Law of Thermodynamics and Equations of State
Christina Bauer
06:46
Physical Chemistry

Calculate the pressure due to a mass of $100 \mathrm{kg}$ in the earth's gravitational field resting on an area of $(a) 100 \mathrm{cm}^{2}$ and (b) $0.01 \mathrm{cm}^{2}$. (c) What area is required to give a pressure of 1 bar?

Chapter 1: Zeroth Law of Thermodynamics and Equations of State
Christina Bauer
11:27
Physical Chemistry

Using Fig. 1.9, calculate the compressibility factor $Z$ for $\mathrm{NH}_{3}(\mathrm{g})$ at $400 \mathrm{K}$ and $50 \mathrm{bar}$.

Chapter 1: Zeroth Law of Thermodynamics and Equations of State
Christina Bauer
12:06
Physical Chemistry

Use the van der Waals constants for $\mathrm{CH}_{4}$ in Table 1.3 to calculate the initial slopes of the plots of the compressibility factor $Z$ versus $P$ at 300 and $600 \mathrm{K}$.

Chapter 1: Zeroth Law of Thermodynamics and Equations of State
Christina Bauer
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Christina's Quick Ask Videos

04:18
Chemistry 101

Both FeO and Fe2O3 contain only iron
and oxygen. The mass ratio of oxygen to iron for each compound is
given in the following table:
Compound mass
O : mass Fe
FeO 0.2865
Fe2O3 0.4297
Show that this data is consistent with the law of multiple
proportions.
03:54
Chemistry 101

Caffeine is not very toxic, but if 10g were consumed in less than an hour, that would be enough to kill about half the people who attempted it (the term is sometimes referred to as LD-50, the lethal dose for 50% of people). Brewed coffee usually contains about 20mg/oz of caffeine. Instant coffee is only about 15mg/oz and decaffeinated coffee has just 0.5mg/oz. Coke, in contrast, has about 4mg/oz. A cup of coffee is usually 6 oz of liquid, whereas a can of coke is 12 oz.
How many cups of brewed coffee would you have to drink in an hour to reach the lethal dose (the LD-50)? How many cups of instant coffee? How many cups of decaffeinated coffee? How many cans of coke?
I need all the calculations also...
I have got these answers, also check if these are correct? If so, please show calculations:
84 cups of brewed coffee
112 cups of instant coffee
3334 cups of decaf
208 cans of coke.
05:04
Chemistry 101

Which of the following statements about the equivalence point of an acid-base titration is true?

a. The equivalence point of an acid-base titration is the same as the indicator endpoint.
b. The equivalence point of an acid-base titration is the point where there is an equivalent amount of titrant and titrand.
c. The equivalence point of an acid-base titration is where the pH = 7.0 (neutral).
d. The equivalence point of an acid-base titration is where the entire volume of the buret has been used.
e. The equivalence point of an acid-base titration is the average value of the dissociation constants.
05:51
Chemistry 101

Select all of the following statements regarding a
pressure-temperature phase diagram which
is/are false.
The solid gas line corresponds to the freezing point at various
temperatures.
The Clausius Clapeyron equation is the mathematical description
of the liquid gas line.
The triple point is the temperature and pressure at which three
phases are in equilibrium.
The slope of the liquid gas line can be positive or
negative.
The fluid phase exists above the critical temperature and
critical pressure.
05:08
Chemistry 101

An unknown sample is analyzed using paper chromatography using
solvent X as mobile phase. One spot is
observed after the paper is developed. The same unknown substance
is re-analyzed using solvent Y as the
mobile phase. This time, three spots are observed after the
paper is visualized.
Is the unknown sample a pure substance or a mixture of various
substances? Explain your answer.
Why did you observe the difference between two solvents?
(Hint: what is the determination factor
of Rf?)
04:12
Chemistry 101

True or False:
The stronger the forces between solute and solvent molecules,
the more exothermic the solution process.
Adding a catalyst lowers the activation energy of a
reaction.
In the Arrhenius equation, ln k = -Ea/RT + ln A, the symbol A
denotes the initial concentration of A.
For a reaction with a second-order rate constant, the correct
unit is M^-1 ∙ time^-1.
If the rate of a specific chemical reaction is independent of
the concentrations of the reactants, the reaction is zero order.
Van der Waals forces are a type of London force.
The phenomenon of supercooling refers to the existence of a
metastable liquid at a temperature below that of its sublimation
point.
The process in which a gas is transformed into a solid is called
solidification.
Surface tension of a liquid is the work or energy required to
increase the surface area of a liquid.
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