In this activity, students explore the effect of chemical erosion on statues and monuments. They use chalk to see what happens when limestone is placed in liquids with different pH values. They also learn several things that engineers are doing to reduce the effects of acid rain.

Students are introduced to the differences between acids and bases and how to use indicators, such as pH paper and red cabbage juice, to distinguish between them.

You can access the problems below via the Load Homework dialogue in the File menu of the Virtual Lab. They have been organized by concept and ranked by difficulty (A ranking of 1 denotes an easier problem; 5 is more challenging). Word files for these problems are provided so that you may edit and distribute the assignments in your classroom. The following types of problems can be found:Strong and Weak Acid and Base Problems, Determination of the pH Scale by the Method of Successive Dilutions, Standardization of NaOH: Acid Base Titration, Determining the pKa and concentration ratio of a protein in solution, Unknown Acid and Base problem, Creating a Buffer Solution, DNA - Dye Binding: Equilibrium and Buffer Solutions.

In this video segment, the ZOOM cast demonstrates how to use cabbage juice to find out if a solution is an acid or a base.

In this interactive activity from the ZOOM Web site, search for chemistry clues and experiment with acids and bases in a virtual kitchen.

In this video segment adapted from ZOOM, two cast members demonstrate what happens when vinegar is added to baking soda inside a container. The resulting chemical reaction produces enough carbon dioxide to launch their paper rocket skyward.

Recommended for: Grades K-5

It would seem that bottles of lemon juice and rockets have only their basic shape in common. However, as two cast members from ZOOM demonstrate in this adapted video segment, when baking soda is added to the mix, a plastic bottle can act very much like a real rocket. Grades 3-8.

The student can check their knowledge of acids and bases.

Este modulo le dara un pequeño tutorial de algunos de los términos básicos e ideas de álgebra lineal. Esto incluira independencia lineal, subespacios generados, y bases.

An interactive applet and associated web page that explain the area of a triangle. The applet shows a triangle that can be reshaped by dragging any vertex. As it changes, the area is continually recalculated using the 'half base times height' method. The triangle has a fixed square grid in its interior that can be used to visually estimate the area for later correlation with the calculated value. The calculation can be hidden while estimation is in progress. The text page has links to a similar page that uses Heron's Formula to compute the area. Applet can be enlarged to full screen size for use with a classroom projector. This resource is a component of the Math Open Reference Interactive Geometry textbook project at http://www.mathopenref.com.

Finding the true probability of an event taking into account misses, false positives, and base rates. Also, using Bayes' Theorem.

Este módulo nos da una descripción de las ondoletas y su utilidad como base en el procesamiento de imagenes. En particular veremos las propiedades de la base de la ondoleta de Haar.

Este módulo define los términos de la transpuesta, el producto interno y la transpuesta Hermitiana y su uso para encontrar una base ortonormal.

In this activity, students use a simple pH indicator to measure how much CO2 is produced during respiration, at rest and after exercising. They begin by comparing some common household solutions in order to determine the color change of the indicator. They review the concepts of pH and respiration and extend their knowledge to measuring the effectiveness of bioremediation in the environment.

To reinforce students' understanding of the human digestion process, the functions of several stomach and small intestine fluids are analyzed, and the concept of simulation is introduced through a short, introductory demonstration of how these fluids work. Students learn what simulation means and how it relates to the engineering process, particularly in biomedical engineering. The teacher demo requires vinegar, baking soda, water and aspirin.

Este modulo da un ejemplo del espacio de las funciones.

El modulo se ve como la descomposición de señales por medio de la expansión de bases ortonormales para proveer una representación alternativa. El modulo presenta varios ejemplos para resolver los problemas y vistos en diferentes tipos de espacios y dimensiones.

Students gain an understanding of the difference between electrical conductors and insulators, and experience recognizing a conductor by its material properties. In a hands-on activity, students build a conductivity tester to determine whether different objects are conductors or insulators. In another activity, students use their understanding of electrical properties to choose appropriate materials to design and build their own basic circuit switch.

This is an on-line prototype for a book aimed at teaching kids the effects of acid mine drainage on our environment through experimentation and observation. Experiments introduce litmus paper, pH testing, neutralization, identification of aquatic organisms and their use as water quality indicators, acid mine drainage, organisms in acidic environments (including plants, bacteria, and algae), oxidation-reduction reactions, the manganese cycle, the water cycle, and treatments for acid mine drainage. The entire document is also available in a downloadable Adobe PDF format.