STEM Series: Chemical Reactions I

Our STEM Series will focus on select biochemistry topics. Our videos are designed for high school-level students. Lecture instructors include UIC Urban Health Program pre-health students and UIC College of Medicine students.

EMBEDDED LINKS:
Vinegar Baking Soda Experiment Instructional Video
https://www.youtube.com/watch?v=Q6KpWk8ttWg&feature=emb_logo

Day in My Life: College Student and CNA (Quarantine Edition)
https://www.youtube.com/watch?v=3fKZGlvj6Qo&feature=emb_logo

Transcript

1. UIC Urban Health Club - Spring 2020 STEM SERIES: CHEMICAL REACTIONS I How can we influence the rate of a chemical reaction?
2. UIC Urban Health Club This week’s STEM Series taken from: CPS Remote Learning “High School Chemistry Project: Staying Home and Slowing the Spread” Source: https://cps.edu/SiteCollectionDocuments/enrichmentlearning/April13/HS-Chemistry-Packet-English-04-13-20.pdf
3. UIC Urban Health Club Activity 1: How can we influence the rate of a chemical reaction?
4. UIC Urban Health Club USEFUL TERMINOLOGY REACTANT: Chemical species that act as the starting material and are consumed throughout the reaction. RATE OF REACTION: Speed at which a chemical reaction proceeds. Expressed in terms of either the concentration of a product formed or the concentration of a reactant that is consumed in a unit of time. PRODUCT: Substances formed as a result of a chemical reaction. AVERAGE KINETIC ENERGY: How fast (or slow) particles are moving. Average kinetic energy is a measure of temperature.
5. UIC Urban Health Club FACTORS AFFECTING RATE OF REACTION ❖ Reaction Concentrations ▪ As the concentration of reactants increases, the rate of reaction will increase. ▪ Why? The greater the concentration of reactants, the greater the number of effective collisions per unit time. ❖ Temperature ▪ As temperature increases, the rate of reaction will increase. ▪ Why? Since temperature of a substance is the measure of the particles’ average kinetic energy, increasing the temperature increases the average kinetic energy of the molecules. ❖ Surface Area ▪ As the surface area increases, the rate of reaction will increase. ▪ Why? If the surface area of a reactant is increased then more particles are exposed to the other reactant and there are more collisions.
6. UIC Urban Health Club Data Collection Option 1: At-Home Lab with Baking Soda and Vinegar Materials needed: • Baking soda (5 teaspoons) • Vinegar (approx ⅔ cup total) • Teaspoon measures • 2-5 small cups or bowls • Bin or tray (such as a tupperware container or baking sheet) that will fit the cup • Water • Ice • Stopwatch/clock with a second hand • Dish soap (optional)
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10. UIC Urban Health Club VIDEO LINK Option 2: Data analysis & Video The student is looking for the best combination of baking soda and vinegar to get the most effective eruption. The student used 50 mL of vinegar in each trial. The data table below shows information on the trials that the student has conducted. If you are able, you can review this video to see the reaction itself:
11. UIC Urban Health Club Data Analysis: *Questions taken from CPS Remote Learning 1. Which trial had the highest/fastest reaction rate? How do you know? (Consider how reaction rate is different from reaction time.) 2. Use either your data, the data provided, or the information from the video to summarize patterns that you observed.
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14. uic.urbanhealthclub@gmail.com Questions & Comments? uic.urbanhealthclub