activity

Rubber Bands, Free Energy, and Le Chatelier's Principle

In this Activity, students compare the temperature change of a rubber band that is quickly stretched compared to one that is quickly relaxed. They predict what effect the stress of heating will have on a stretched rubber strip and test their prediction.

Hunting for Chemicals in Consumer Products

In this Activity, students use written clues to determine the identities of 12 chemical compounds. They write the name and chemical formula for each compound, and find a consumer product in which each compound is present. This Activity increases student awareness of the presence of a variety of chemical compounds in a range of common consumer products.

Spring Shock! Impact of Spring Snowmelt on Lakes and Streams

In this Activity, students investigate "spring shock", the flow of acidic water into lakes and streams that occurs during snowmelt in the spring. They freeze vinegar in ice cube trays, and then allow the cubes to melt at room temperature through a funnel. They collect the liquid and monitor its pH. This Activity could be used in units on environmental chemistry and water chemistry.

Through the Looking Glass

In this Activity, students compare several different window cleaner recipes to determine the purpose each ingredient in a window cleaner serves. They use different combinations of water (solvent), isopropyl alcohol (wetting agent), and ammonia (grease cutter). They then develop their own "New and Improved" recipe to test its performance against commercial window cleaner.

Fizzy Drinks: Stoichiometry You Can Taste

In this Activity, students make their own version of "Fizzies", a carbonated drink product. Students use different combinations of powdered drink mix, citric acid, baking soda, and water to try to create a good-tasting beverage. The Activity enables students to see the practical benefits of stoichiometry when they use it to develop a product they can immediately consume.

The Science Mentor: An Adventure in Chemistry Education

In this Activity, students learn about a demonstration and activity that they could use with elementary students. The demonstration uses an effervescent antacid tablet such as Alka Seltzer with water to blow up a balloon. The activity also uses the tablet with water, this time in a film canister.

Acid-Base Reactions with Carbon Dioxide

In this Activity, students investigate two acid-base reactions. In the first reaction, an aqueous solution of powdered laundry detergent is neutralized with the acid formed by the dissolution of exhaled carbon dioxide. This uses the spice turmeric as an indicator. In the second reaction, vinegar and baking soda produce carbon dioxide gas.

Bubble, Bubble, Toil and Trouble

In this Activity, students first create a standard bubble solution by mixing water with liquid dishwashing detergent. They then add different substances to samples of the detergent solution. The solutions are compared to see which produces the longest-lasting bubbles. The Activity is a fun way to introduce the concepts of surface tension, intermolecular forces, and the use of surfactants.

Acid Raindrops Keep Fallin' in My Lake

In this Activity, students simulate acid rain falling on lakes by adding vinegar to bowls of water. Several of the bowls contain solids such as crushed, low-dust chalk, sand, and lime. Students determine whether the solids affect the acidity of each solution over two days by periodically removing samples of each solution for testing with red cabbage indicator.