Question
In a container, a solid consisting of clear crystals is combined with a blue liquid and the following observations are obtained:
How many of the listed observations indicate a new substance was formed?
~ The color of the liquid changes from blue to red
~ The solid got larger.
~ Solution temperature changed from 20∘
to 30∘
~ Bubbles were forming in the container
Responses
1
1
2
How many of the listed observations indicate a new substance was formed?
~ The color of the liquid changes from blue to red
~ The solid got larger.
~ Solution temperature changed from 20∘
to 30∘
~ Bubbles were forming in the container
Responses
1
1
2
Answers
GPT-4o mini
To determine how many of the listed observations indicate that a new substance was formed, let's analyze each observation:
1. **The color of the liquid changes from blue to red**: This indicates a chemical change, suggesting that a new substance may have been formed.
2. **The solid got larger**: This may indicate either a physical change (such as crystallization) or a reaction. By itself, this does not definitively indicate the formation of a new substance.
3. **Solution temperature changed from 20°C to 30°C**: A temperature change can indicate an exothermic or endothermic reaction, suggesting that a reactant has been transformed into a product, which implies a new substance may have been formed.
4. **Bubbles were forming in the container**: The formation of bubbles often indicates gas production, which typically occurs during a chemical reaction. This suggests that new substances have likely formed.
Based on the analysis:
- The first observation (color change).
- The third observation (temperature change).
- The fourth observation (bubbles forming).
These observations indicate the formation of new substances. The second observation does not definitively indicate a new substance without further context.
Therefore, **3 observations** indicate that a new substance was formed.
1. **The color of the liquid changes from blue to red**: This indicates a chemical change, suggesting that a new substance may have been formed.
2. **The solid got larger**: This may indicate either a physical change (such as crystallization) or a reaction. By itself, this does not definitively indicate the formation of a new substance.
3. **Solution temperature changed from 20°C to 30°C**: A temperature change can indicate an exothermic or endothermic reaction, suggesting that a reactant has been transformed into a product, which implies a new substance may have been formed.
4. **Bubbles were forming in the container**: The formation of bubbles often indicates gas production, which typically occurs during a chemical reaction. This suggests that new substances have likely formed.
Based on the analysis:
- The first observation (color change).
- The third observation (temperature change).
- The fourth observation (bubbles forming).
These observations indicate the formation of new substances. The second observation does not definitively indicate a new substance without further context.
Therefore, **3 observations** indicate that a new substance was formed.