Unsolving a ‘Murder Case’ in chemistry classes Testing why extra oxygen can be toxic


Gurleen Swaich

Using as oxygen as the prime suspect in their ‘murder case,’ students in Jennifer Conders’ chemistry classes are creating reactions using hydrogen peroxide. 

“We are comparing water and hydrogen peroxide to see how one extra oxygen can affect reactivity,” Conder said. “This will help students determine why carbon monoxide is poisonous and I wanted a more exciting way to teach the next concept which will help them to solve the cases.”

Students will solved the ‘murder case’ by using previous knowledge regarding oxygen and chemicals to understand the potential harm of carbon monoxide.

“The chemistry lab helped me understand everything we went over because we were actually interacting with chemicals and this helped build on what I already knew,” sophomore Ralph Quinto said. “This lab went along with our murder case and it helped me in understanding how carbon monoxide is poisonous and helped provide evidence to support that idea.”

For the lab, students added potatoes, yeast and dish soap into hydrogen peroxide and water and watched as the substances reacted with the hydrogen peroxide. 

“I genuinely liked this trial because it’s interactive and it allows us to learn hands-on with hydrogen peroxide and water about bonding,” sophomore Brinn Harms said. “I feel like this will help me more in chemistry because I am a visual learner and this allowed me to see the concept and understand it better than I would have if we just read.”

By using a different method of teaching, students could learn about the potential toxicity of oxygen. They could then use this information analyze the ‘murder case’ more in-depth.

“I am hoping to teach students lab skills and problem solving skills so they can brainstorm together to solve the case,” Conder said. “I expect students to be able to understand how to see the difference of how hydrogen peroxide and water react so that they can predict why carbon dioxide and carbon monoxide react differently.”