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Categories: Teacher Demonstration
Osmosis is the process by which the concentrations of two solutions equalize across a selectively permeable membrane. Osmosis is necessary for the digestive and excretory systems to function. This demonstration models the behaviour of cells in hypertonic and hypotonic... read moreCategories: Teacher Demonstration
This demonstration illustrates the importance of enzymes in the human body. Enzymes catalyze many important chemical reactions in the body. This demonstration is a visual example of how the enzyme catalase, which is present in all cells, but in highest concentrations... read moreCategories: Teacher Demonstration
This quick demonstration is a highly visual illustration of the use of acid-base indicators to determine pH. Milk of magnesia is mostly a suspension of magnesium hydroxide in water. Magnesium hydroxide is a strong base that readily neutralizes hydrochloric acid.... read moreCategories: Lab/Student Activity
An astrolabe illustrates how the sky looks at any given time of day and throughout the year. This is accomplished by drawing the sky (star patterns) on the astrolabe with moveable parts to adjust for the date and time. The traditional sky map astrolabe allowed people... read moreCategories: Teacher Demonstration
The International Astronomical Union classifies solar system bodies into three categories: planets, dwarf planets, and small solar system bodies (including comets, asteroids, and meteoroids). There are eight planets in the solar system with two distinct groupings. The... read moreCategories: Lab/Student Activity, Teacher Demonstration
In this demo, a polyethylene rod is charged by rubbing with wool. The charged rod is then used to bend a stream of water flowing from a tap. Different substances have different attractions for electrons. When two materials are rubbed together, electrons will leave the... read moreCategories: Lab/Student Activity, Teacher Demonstration
This demonstration/activity involves the safe production of oxygen, hydrogen, and carbon dioxide gases, as well as the appropriate results for tests used to identify these gases. read moreCategories: Teacher Demonstration
When you gaze up in the night sky some stars will be very bright while other stars are barely visible to the unaided eye. With the aid of binoculars you may be able to observe different colours in the stars. The brightness and colour of a star depends on three... read moreCategories: Lab/Student Activity
There are eight planets in the solar system in two distinct groupings. The four inner terrestrial planets (Mercury, Venus, Earth, and Mars) are very small and relatively close together. The outer planets or gas giants (Jupiter, Saturn, Uranus, and Neptune) are very... read moreCategories: Lab/Student Activity
The sky has been mystifying civilizations for thousands of years. Many civilizations have performed religious ceremonies and timed agricultural activities based on celestial events such as eclipses and full moons. Arguably the most important benefit of making... read more