This pathway explores the properties of water that make it essential for life. Key properties of water discussed in this pathway include water as a solvent, hydrogen bonding, specific heat and cohesion.
Students take advantage of the natural ability of red cabbage juice to perform as a pH indicator to test the pH of seven common household liquids. Then they evaluate the accuracy of the red cabbage indicator, by testing the pH of the liquids using an engineer-designed tool, pH indicator strips. Like environmental engineers working on water remediation or water treatment projects, understanding the chemical properties (including pH) of contaminants is important for safeguarding the health of environmental water sources and systems.
Students explore the volume of three-dimensional shapes, connecting it to the operations of multiplication and addition, as well as classify two-dimensional shapes hierarchically.
Students learn about the properties of solutions—such as ion interactions, surface tension and viscosity—as they make their own soap and shampoo and then compare their properties. Working as if they are chemical engineers, they explore and compare how the two surfactants behave in tap water, as well as classroom-prepared acidic water, hard water and seawater using four tests: a “shake test” (assessing the amount of bubbles produced), a surface tension test, a viscosity test, and a pH test. Then they coalesce their findings into a recommendation for how to engineer the best soap versus shampoo. The activity may be shortened by using purchased liquid soap and shampoo from which students proceed to conduct the four tests. A lab worksheet and post-quiz are provided.
What are some strategies for achieving the goal of every child reading? This site features several activities to achieve this goal with your readers.
An example of calculating the pH before the equivalence point for titration of strong acid, hydrochloric acid, with strong base, NaOH. [10:12]
Khan Academy learning modules include a Community space where users can ask questions and seek help from community members. Educators should consult with their Technology administrators to determine the use of Khan Academy learning modules in their classroom. Please review materials from external sites before sharing with students.
An example calculating the pH at and after the equivalence point for titration of strong acid, hydrochloric acid, with strong base, NaOH. [10:17]
Khan Academy learning modules include a Community space where users can ask questions and seek help from community members. Educators should consult with their Technology administrators to determine the use of Khan Academy learning modules in their classroom. Please review materials from external sites before sharing with students.
Take a look at this tutorial to learn how to use the formula for the area of a triangle to find the height if you already know the area and the length of the base. [6:09]
Watch this tutorial to learn about the formula for the volume of a cylinder which is the same as the formula for the area of a circle. [5:33]
The lesson from WyzAnt begins with a review of the definition of exponents then proceeds to several examples which show the definition in action. Special cases such as those involving negative bases as well as the zero exponent and the exponent of 1 are also discussed. An interactive resource at the end of the lesson is provided for student practice.