Tiffany Noble

University of Texas at Austin
High School physics

Biography

I am a high school teacher with 6 years experience in sciences. I majored in Chemistry at The University of Texas at Austin for my Bachelors and got my Masters in education at Capella University. I have taught IB Physics, IB Biology and Chemistry. I am also very well versed in math because that was my minor.

Education

BA Chemistry
University of Texas at Austin
MS MS education
Capella University

Educator Statistics

Numerade tutor for 6 years
150 Students Helped

Topics Covered

Mastering Chemical Reactions and Stoichiometry for Optimal Results
Understanding Electronic Structure: A Comprehensive Guide
Explore the Fascinating World of Nuclear Chemistry
Understanding Chemical Bonding: The Key to Molecular Structure
Exploring the Fascinating World of Electrochemistry | Learn More Now

Tiffany's Textbook Answer Videos

02:24
Chemistry: Structure and Properties

Iron(III) oxide reacts with carbon monoxide according to the equation:
Fe2O3(s) + 3 CO(g)-2 Fe(s) + 3 CO2(g)

A reaction mixture initially contains 22.55 g Fe2O3 and 14.78 g CO. Once the reaction has occurred as completely as possible, what mass (in g) of the excess reactant remains?

Chapter 7: Chemical Reactions and Chemical Quantities
Tiffany Noble
00:54
Chemistry A Molecular Approach

. How do you determine the number of electrons in the Lewis structure of a molecule? A polyatomic ion?

Chapter 9: Chemical Bonding I: The Lewis Model
Tiffany Noble
03:23
Chemistry A Molecular Approach

Use Lewis symbols to determine the formula for the compound that forms between each pair of elements:
\begin{equation}\text{ a. Ca and N }\quad \text { b. Mg and I } \quad \text { c. Ca and S } \quad\text { d. Cs and F }\end{equation}

Chapter 9: Chemical Bonding I: The Lewis Model
Tiffany Noble
02:20
Chemistry A Molecular Approach

Use the Born-Haber cycle and data from Appendix IIB and Table 9.3 to calculate the lattice energy of CaO. $\left(\Delta H_{\mathrm{Sub}}\right.$ for calcium is $178 \mathrm{kJ} / \mathrm{mol} ; \mathrm{IE}_{1}$ and $\mathrm{IE}_{2}$ for calcium are 590 $\mathrm{kJ} / \mathrm{mol}$ and $1145 \mathrm{kJ} / \mathrm{mol},$ respectively; EA $_{1}$ and $\mathrm{EA}_{2}$ for $\mathrm{O}$ are $-141 \mathrm{kJ} / \mathrm{mol}$ and $744 \mathrm{kJ} / \mathrm{mol},$ respectively.)

Chapter 9: Chemical Bonding I: The Lewis Model
Tiffany Noble
02:21
Chemistry A Molecular Approach

Draw the Lewis structure for BrF with an arrow representing the dipole moment. Refer to Figure 9.10 to estimate the percent ionic character of the BrF bond.

Chapter 9: Chemical Bonding I: The Lewis Model
Tiffany Noble
02:57
Chemistry A Molecular Approach

Write a Lewis structure that obeys the octet rule for each ion. Include resonance structures if necessary and assign formal charges to each atom.
\begin{equation}a.\mathrm{ClO}_{3}\ ^{-} \quad \text { b. } \mathrm{ClO}_{4}\ ^{-} \quad \text { c. } \mathrm{NO}_{3}\ ^{-} \quad \text { d. } \mathrm{NH}_{4}\ ^{+}\end{equation}

Chapter 9: Chemical Bonding I: The Lewis Model
Tiffany Noble
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Tiffany's Quick Ask Videos

04:42
Algebra

Tiffany Noble
1