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This online calculator computes radioactive decay, timed decay, and timed solid disposal for a databank containing 116 isotopes. It also features University of British Columbia disposal limits and a unit converter and date/time calculators. These tools calculate the half-life for selected isotopes; radioactive decay final activity, given the initial activity and decay time; the decay time, given the ... Full description.
Grade level: High (9-12), College (13-14), College (15-16), Graduate / Professional
Resource type: Calculation / Conversion tool
Subject: Chemistry, Physics
 
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This classroom activity has students determine the concentration of oxygen in air at their location. Oxygen is removed from a trapped volume of air by the oxidation of steel wool and by measuring the volume of air remaining they can calculate the percentage of oxygen in the air. The site has a stated objective, a list of materials, procedure, activity answers, ideas from teachers, and links to related ... Full description.
Grade level: Middle (6-8)
Resource type: Classroom activity
Subject: Atmospheric science, Chemistry
 
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National Science Education Standards (NSES): Read
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This hands-on activity shows students what happens when the fresh water of a river meets the salt water of the ocean. They will make a saturated solution of colored salt water, pour it into fresh water, and observe what happens. There are also extensions to the activity in which they add a third layer of water of intermediate salinity, and test two solutions by floating a pencil in them. There is ... Full description.
Grade level: Primary (K-2), Intermediate (3-5)
Resource type: Lab activity
Subject: Chemistry, Physical oceanography
 
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National Science Education Standards (NSES): Read
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This report documents the findings of a 10th-grader from Utah who decided to test water samples to find out for himself how safe the water was in his home town. The narrative essay, with illustrations and photographs, discusses how his biology class ignited his concern for environmental issues. It describes his expedition to uncover the unseen factors affecting the water quality in his town, including ... Full description.
Grade level: Middle (6-8), High (9-12)
Resource type: Illustration - scientific, Photograph, Report
Subject: Chemistry, Environmental science
 
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Students will seek to understand trends that are shown by graphical analysis of ozone measurements over time. Students will investigate ozone chemistry and issues around the preservation of the Earth?s ozone layer, and learn how to read false color images of ozone concentration. They will then interpret trends from graphs of data and construct a correctly labeled graph. This lesson uses NASA images ... Full description.
Grade level: Middle (6-8), High (9-12)
Resource type: Classroom activity, Guide for instructor
Subject: Atmospheric science, Chemistry
 
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National Science Education Standards (NSES): Read
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This collection of experiments introduces students to techniques for measuring pH. They will learn how to use pH paper, how to use a garden soil test kit to measure the pH of liquids, how to record their observations, and some lab safety tips. In the experiments, they will measure the pH of some common substances (water, soil, and others), learn about buffering in soils and natural waters, and observe ... Full description.
Grade level: Intermediate (3-5), Middle (6-8)
Resource type: Field activity, Lab activity
Subject: Atmospheric science, Chemistry
 
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This experiment will help students understand that soil sometimes contains substances, like limestone, that buffer acids or bases, and that some salts in soil may also act as buffers. They will collect soil samples from their lawn, garden, or school and look for buffering effects by observing the pH change of an acid mixture poured through the samples. If the water collected from the sample is less ... Full description.
Grade level: Middle (6-8), High (9-12)
Resource type: Field activity, Lab activity
Subject: Chemistry, Soil science
 
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National Science Education Standards (NSES): Read
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This demonstration aims to teach students about the nature of carbon, the different types of compounds it exists in (e.g. charcoal, glucose, carbon dioxide), the biochemical reactions it takes part in (photosynthesis and respiration), the range of processes that carbon and carbon compounds are involved in on Earth, and how these link together to form the carbon cycle. Students will be reminded that ... Full description.
Grade level: Middle (6-8)
Resource type: Guide for instructor, Presentation / Demo
Subject: Chemistry, Environmental science
 
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In this activity, students heat limestone (mainly calcium carbonate) to form lime (calcium oxide) and note the differences between the reactions of limestone and lime with water, acids and carbon dioxide. Adding water to the lime produces slaked lime (calcium hydroxide) in an exothermic reaction. Some of the calcium hydroxide dissolves in the water, producing an alkaline solution called limewater. ... Full description.
Grade level: Middle (6-8), High (9-12)
Resource type: Lab activity, Glossary, Ref. material
Subject: Chemistry, Mineralogy or petrology
 
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This activity illustrates some of the uses of limestone and limestone products by relating them to everyday activities of the students. Students fill in a timetable of their activities in the morning from waking up to leaving for school. Discussion with the teacher and/or reference book or web-based research follows, and students will discover that a number of activities have a link to limestone in ... Full description.
Grade level: Middle (6-8), High (9-12)
Resource type: Classroom activity, Glossary
Subject: Chemistry, Mineralogy or petrology
 
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National Science Education Standards (NSES): Read
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Results 31 - 40 of 193 <<  1 2 3 4 5 6 7 8  >>