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.
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.
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