Chemistry Collective
Chem Collective: Weak Acid and Base Problems
Textbook-style weak acid and base problems that can be checked using the Virtual Lab.
Colby College
Spanish Language & Culture: El Presente Del Subjuntivo
This Spanish grammar exercise provides excellent practice in conjugating present subjunctive verbs. Fifty different infinitives give the student plenty of practice with spelling changes and regular, irregular, and stem-changing...
Other
Spaleon: Future Tense
A great tool from Spanish-Learn It Online (Spaleon) to practice verb conjugations in the future tense. The student may choose the type of verb (regular, irregular, etc.) that needs to be drilled. As each answer is entered, the student...
Colby College
Spanish Language & Culture: The Future Tense
Colby College provides a great explanation of how to conjugate verbs in the future tense, with English translations of the examples. Twenty sentences provide fantastic practice in changing verbs from preterite tense to future tense...
Other
Spaleon: Present Subjunctive
A great tool from Spanish-Learn It Online (Spaleon) to practice verb conjugations in the present subjunctive tense. The student may choose the type of verb (regular, irregular, etc.) that needs to be drilled. As each answer is entered,...
Math Medics
S.o.s. Math: The Complex Numbers
This lesson may be useful to both persons with prior knowledge of complex numbers and those without. The lesson begins with the definition of complex numbers and its notation, then gives the rules of arithmetic for them with exercises....
Languages Online
Languages Online: The Subjunctive in Spanish
Wonderful practice conjugating verbs in the present subjunctive. Sentences illustrate conjugations that have spelling changes or are regular, irregular, or stem-changing verbs. The "vosotros" form is used in some exercises. All six...
BusinessSpanish.com
Business Spanish: Ser & Estar: To Be
The perfect resource for making sense out of the two trickiest verbs in Spanish. This site does an excellent job at explaining, providing details and showing ser and estar conjugations.
Other
Spaleon: Imperfect Tense
A great tool to practice verb conjugations in the imperfect tense. The student may choose the type of verb (regular, irregular, etc.) that needs to be drilled. As each answer is entered, the student receives immediate feedback on the...
CK-12 Foundation
Ck 12: Analysis: Products and Quotients of Complex Numbers
[Free Registration/Login may be required to access all resource tools.] In this lesson, students calculate the products and quotients of complex numbers, identifying conjugates. Students examine guided notes, review guided practice,...
CK-12 Foundation
Ck 12: Find Imaginary Solutions: Fundamental Theorem of Algebra
[Free Registration/Login may be required to access all resource tools.] Here you will learn about the Fundamental Theorem of Algebra, and how to apply it to various functions. You will also review using the quadratic equation to find...
Other
Karl's Calculus Tutor: Algebra Concepts Polynomials
This site gives a brief explanation to topics that are prerequisites to studying calculus. Among these operations factoring of polynomials. Special polynomials such as conjugates and differences of squares are also mentioned.
Colby College
Spanish Language & Culture: El Preterito Formas (Part 2)
These exercises review irregular verbs, stem-changers, and spelling changes in the preterite tense. Conjugate verbs to match the subject. Answers may be checked and corrected.
Other
Santa Monica College: J. Cheney: Lay or Lie?
Definitions and conjugations of the verbs "lay" and "lie" followed by six practice sentences in which students are asked to complete the sentences by choosing the correct verb. Students can submit answers to see how many are correct and...
Language Guide
Language Guide: Spanish
This guide provides the user with lists of Spanish vocabulary words on topics such as the home, animals, and food. It includes images as well as a pronunciation guide. The guide also includes grammar lessons and verb conjugations. The...
Google
Google for Education: Present Participle
In this example students learn two special cases for the past and present participle of verbs. They reinforce their understanding by completing a Python program to correctly conjugate special cases of verbs.
Khan Academy
Khan Academy: Genetic Variation in Prokaryotes
Study the mechanisms that generate variation in prokaryote populations. Also learn about transduction, transformation, conjugation, as well as transposable elements.
Study Languages
Study Spanish: Preterite Tense Regular Verbs
Excellent examples of the preterite tense for regular verbs. You can also generate a quiz where you can select 10 to 25 sample questions to help test your knowledge of regular verb conjugations in the preterite tense.
BBC
Bbc: Higher Bitesize Maths: Quadratic Theory
A tutorial on quadratics presents topics including: factoring and solving quadratics, graphing quadratic functions, using completing the square and the quadratic formula to solve functions, the discriminant and conjugates. Plenty of...
Larson Texts
Larson Precalculus: Operations of Complex Numbers in the Complex Plane [Pdf]
A 3-page handout with examples and exercises in adding, subtracting, and multiplying complex numbers in the complex plane, as well as finding complex conjugates.
Colby College
Spanish Language & Culture: The Preterite Tense
These exercises from Colby College provide a very extensive review of irregular verbs, stem-changers, and spelling changes in the preterite tense for more than 50 verbs. Practice conjugating these verbs in verb charts. Answers may be...
State University of New York
State University of New York: P H of Buffer Solutions
This simulation allows the study of the pH of buffer solutions. Six acid-base conjugate pairs are available, and the concentration of the acid and of the base can be adjusted over one order of magnitude.
Online Writing Lab at Purdue University
Purdue University Owl: Verbs With Helpers
An explanation of how to use helping words with verbs, depending on the conjugation of the verb and the tense.
Languages Online
Languages Online: Imperfect Subjunctive Ra Ending
This exercise-practice the teaches students how to write imperfect subjunctive endings for regular and irregular Spanish verbs. Immediate feedback is available to check answers. Tutorials in other langauges available from the homepage.