Introduction
For this lab activity, you will observe two scenarios — The Iced Tea Debate and Salty Soup — and record your observations of physical and chemical change. During your observations, you will determine how each scenario represents the laws of conservation of matter and energy.
Problem:
How can matter and energy be described and conserved in a variety of systems?
Hypotheses:
As you view each scenario, make a prediction about what will occur when prompted by the video.
The Iced Tea Debate:
If the temperature of the iced tea__________________, then the iced tea ___________________________.
The Salty Soup:
Hypothesis 1: What will happen to the soup as it is heated on the burner?
If the temperature of the soup_________________, causing the soup to boil, then ___________________________.
Hypothesis 2: 2nd pause in the video.
If the soup is salty __________________________________________, then ___________________________ will make the soup less salty.
Materials:
Demonstrations: “The Iced Tea Debate” and “The Salty Soup.”
Procedures:
Observe and analyze the following video demonstrations: “The Iced Tea Debate” and “The Salty Soup.”
Use the data table to record observations on physical and chemical change, and the conservation of matter and energy.
Data Table:
Scenario: The Iced Tea Debate
Observations:
- When the ice is added to the hot tea, it starts to melt.
- As the ice melts, the tea becomes cooler.
- There is a physical change as the ice melts into water.
- The tea's temperature decreases, representing the conservation of energy.
- The total mass of the tea and ice remains the same, representing the conservation of matter.
Scenario: The Salty Soup
Observations:
Hypothesis 1:
- As the soup is heated on the burner, it starts to boil.
- The liquid in the soup evaporates and turns into steam.
- There is a physical change as the liquid changes into gas.
- The temperature of the soup increases, representing the conservation of energy.
- The total mass of the soup remains the same, representing the conservation of matter.
Hypothesis 2:
- If the soup is salty, adding water will dilute the salt concentration.
- Mixing water with the soup will decrease the saltiness.
- There is a chemical change as the water reacts with the salt to form a less concentrated solution.
- The total mass of the soup and water remains the same, representing the conservation of matter.
- The saltiness of the soup decreases, representing the conservation of energy.
Thankyou!
You're welcome! If you have any more questions, feel free to ask.
To complete this lab activity, follow the steps below:
1. Watch the video demonstrations titled "The Iced Tea Debate" and "The Salty Soup."
2. Make predictions, or hypotheses, about what will occur in each scenario based on the prompts given in the video.
For "The Iced Tea Debate":
3. Hypothesize what will happen to the iced tea when the temperature is changed.
- For example, if the temperature of the iced tea decreases, then the iced tea will become colder.
For "The Salty Soup":
4. Hypothesize what will happen to the soup as it is heated on the burner.
- For example, if the temperature of the soup increases, causing the soup to boil, then the soup will become hotter.
5. Make a second hypothesis for the 2nd pause in the video, regarding the saltiness of the soup.
- For example, if the soup is salty, then adding a certain ingredient will make the soup less salty.
6. Gather the required materials for the lab activity, which include the demonstrations: "The Iced Tea Debate" and "The Salty Soup."
7. Follow the procedures mentioned in the lab instructions, which involve observing and analyzing the video demonstrations.
8. Use the provided data table to record your observations on physical and chemical changes, as well as the conservation of matter and energy.
By following these steps, you will be able to complete the lab activity and record your observations and hypotheses accurately.