Lawrence Hall of Science
The Math Page: Skill in Algebra: The Difference of Two Squares
Here is a site that clearly and thoroughly explains factoring and multiplying a difference of two squares. There are example problems solved, problems for the student to attempt, and answers to the student problems. A set of cumulative...
Colby College
Spanish Language & Culture: Se for Unplanned or Unexpected Events
In this brief exercise, the student chooses the best Spanish expression to complete each sentence. Feedback on the response is immediate. Great review of third person preterite tense forms. Practices the use of "se" and an indirect...
BiologyWise
Biology Wise: Biology for Beginners: What Is Spirogyra?
Describes the parts, structure, and the several methods of reproduction of spirogyra, a type of green algae.
CK-12 Foundation
Ck 12: Products and Quotients of Complex Numbers
[Free Registration/Login may be required to access all resource tools.] A collection of resources for learning about and practicing how to multiply and divide complex numbers.
Interactive Mathematics
Interactive Mathematics: Products and Quotients of Complex Numbers
Complex numbers are multiplied and divided using polar and exponential forms. Several examples are provided to demonstrate the process. Includes practice questions.
Other
Bowdoin College: Spanish Tools Grammar Online Book: Spanish Stem Changing Verbs
Review stem-changing verbs such as pedir or dormir. Provides the present tense forms as well as the gerund, subjunctive, past subjunctive and the preterite. Also provides a list of similar verbs. Excellent review and resource.
CK-12 Foundation
Ck 12: Life Science: 5.4 Bacteria Reproduction
Explore the different types of bacteria reproduction.
Other
Stat Soft: Statistics Glossary
Dozens of statistical terms are defined and illustrated in this glossary.
National Council of Teachers of Mathematics
The Math Forum: Analytic Geometry Formulas, Hyperbolas
At this site from the Math Forum, a brief overview on calculating various measures of segments, like the transverse and conjugate axes and the distance between foci, is given. Additionally, equations of hyperbolas in general, standard,...
Languages Online
Languages Online: El Efecto De Mal Tiempo
Practice conjugating verbs in the preterite or imperfect tense in the context of weather. After filling in the blanks in this news story, you may check your answers.
Digital Dialects
Digital Dialects: To Be and to Have in the French Language
Learn to conjugate the verbs "to be" and "to have" then you can go and play the game.
Study Languages
Study Spanish: Irregular Verbs: Estar, Ir, Dar
This introduction to the present tense conjugation of the irregular verbs "dar", "ir" and "estar" is easy to understand and includes a short test at the end to test the student's mastery of this grammar principle.
State University of New York
State University of New York: Buffer Solutions
This simulation introduces buffer solutions.
TES Global
Blendspace: Present Simple vs. Present Continuous
In this TES Blendspace, students will have access to thirteen multimedia resources that will help them learn the differences between the present simple verb tense and the present continuous verb tense. Each space's subtitle includes a...
CK-12 Foundation
Ck 12: Biology: Prokaryote Reproduction
[Free Registration/Login may be required to access all resource tools.] Discusses how prokaryotes reproduce.
Lawrence Hall of Science
The Math Page: Topics in Pre Calculus: Roots of Higher Degree Polynomial
Here is a site that clearly and thoroughly explains how to find the roots of polynomials of degree greater than two. There are example problems solved, problems for the student to attempt, and answers to the student problems. Point this...
Lawrence Hall of Science
The Math Page: Skill in Algebra: Multiplying and Dividing Radicals
Here is a site that clearly and thoroughly explains multiplying and dividing radical expressions. There are example problems solved, problems for the student to attempt, and answers to the student problems. Point this site out to...
Other
Spanish Flashcards
This selection of flashcards for Spanish grammar and vocabulary--often with scoring and self-correcting capabilities--are correlated to commonly used Spanish textbooks such as "Ven Conmigo" and "En Espanol." Includes many other features...
University of Texas at Austin
Tex's French Grammar: Irregular Subjunctive
This site from Tex's French Grammar provides a concise explanation of the subjunctive mood, listing some verbs that have irregular formations in the subjunctive. Brief explanation of when to use focuses primarily on "il faut que"...
Cut the Knot
Cut the Knot: Existence of the Orthocenter
This site defines the altitude of a triangle and gives the standard notation for altitudes of a triangle. The site then goes to list several proofs involving altitudes and orthocenters.
Columbia University
Intensive Organic Chemistry: Arenes and Aromaticity
Lecture notes from Chapter on Arenes & Aromaticity. Can be downloaded using Adobe Acrobat.
Cosmo Learning
Cosmo Learning: Chemical Structure and Reactivity
A collection of video lectures from a professor at the University of California, Berkeley for a chemical structure and reactivity course. The course teaches about aromatic compounds, electronic spectroscopy, and the reactivity and...
Cosmo Learning
Cosmo Learning: Chemistry 3 B: Chemical Structure and Reactivity
A collection of video lectures from a chemical structure and reactivity course taught at the University of California, Berkeley. The course teaches conjunction, aromatic theory, carbonyl compounds, carbohydrates, amines, carboxylic acid....
Other
Orthonet Quick Look Up to Check Orthography
Type in a noun or verb (infinitive only), and site quickly returns info and usage examples. Not a dictionary - provides sample phrases, notes on past participle agreement etc.