Question
Coffee Cup Calorimeter
Coffee Cup Calorimeter
Some chemical reactions release thermal energy and some reactions gain thermal energy. Sam and Alex want to make a calorimeter, which is a device that can measure thermal energy (heat) changes during chemical reactions involving a sample. Sam and Alex design their device to measure these changes. A drawing of their calorimeter is shown below.
The illustration titled 'Coffee Cup Calorimeter' shows nested Styrofoam cups as insulation and a cork stopper that seals the top cup. Inside the cup is a sample cube and water that surrounds the sample. A stirrer and thermometer are inserted through the cork stopper into the cup. The bottoms of the stirrer and thermometer are in the water.
As a reaction occurs involving the sample, changes occur in the system based on whether the reaction gains or releases thermal energy.
Multiple Select Question
The students are given an unknown sample to place in the calorimeter, as shown in the passage. They measure the initial and final temperatures of the water in the calorimeter. The temperatures are shown below.
Initial temperature is 24 degrees celsius. Final temperature is 26 degrees celsius.
Select THREE statements below that describe energy or matter for this reaction in the coffee cup calorimeter system.
A.
Before the reaction begins, the water and the sample are present in the same state of matter.
B.
The temperature measurement describes the average potential energy of the particles of matter in the cup system.
C.
The reaction caused energy to be released into the surrounding water.
Coffee Cup Calorimeter
Some chemical reactions release thermal energy and some reactions gain thermal energy. Sam and Alex want to make a calorimeter, which is a device that can measure thermal energy (heat) changes during chemical reactions involving a sample. Sam and Alex design their device to measure these changes. A drawing of their calorimeter is shown below.
The illustration titled 'Coffee Cup Calorimeter' shows nested Styrofoam cups as insulation and a cork stopper that seals the top cup. Inside the cup is a sample cube and water that surrounds the sample. A stirrer and thermometer are inserted through the cork stopper into the cup. The bottoms of the stirrer and thermometer are in the water.
As a reaction occurs involving the sample, changes occur in the system based on whether the reaction gains or releases thermal energy.
Multiple Select Question
The students are given an unknown sample to place in the calorimeter, as shown in the passage. They measure the initial and final temperatures of the water in the calorimeter. The temperatures are shown below.
Initial temperature is 24 degrees celsius. Final temperature is 26 degrees celsius.
Select THREE statements below that describe energy or matter for this reaction in the coffee cup calorimeter system.
A.
Before the reaction begins, the water and the sample are present in the same state of matter.
B.
The temperature measurement describes the average potential energy of the particles of matter in the cup system.
C.
The reaction caused energy to be released into the surrounding water.
Answers
GPT-4o mini
Based on the information provided about the calorimeter and the temperature changes observed during the reaction, we can analyze the statements. Given that the initial temperature of the water is 24 degrees Celsius and the final temperature is 26 degrees Celsius, we can assess the statements as follows:
1. **A. Before the reaction begins, the water and the sample are present in the same state of matter.**
This statement is likely **incorrect** unless the sample is explicitly mentioned to be a liquid (like water). In most calorimeter experiments involving solids (like a cube), the sample (solid) and water (liquid) are not in the same state of matter.
2. **B. The temperature measurement describes the average potential energy of the particles of matter in the cup system.**
This statement is somewhat confusing. Temperature is more directly related to the average kinetic energy of the particles rather than potential energy. Therefore, this statement can be considered **incorrect**.
3. **C. The reaction caused energy to be released into the surrounding water.**
This statement is **incorrect based on the temperature change**: since the final temperature is higher than the initial temperature, it indicates that the water absorbed energy from the reaction, which is a sign of an endothermic reaction or the absorption of heat rather than a release of heat.
Given the instructions to select three statements, it appears that not all statements can be confirmed as correct based on the information provided. However, if you require a correction to the given options or additional context to understand the calorimetry experiment fully, please provide that guidance.
It seems like there is a misunderstanding in terms of your selection of statements. Here’s what should have been evaluated:
- **C** is indeed **incorrect** as the system absorbed energy from the reaction.
- Thus, for a set of three statements, we might need different options, because A, B, and C are not accurate in the context provided.
Please provide further options or clarify the parameters if possible!
1. **A. Before the reaction begins, the water and the sample are present in the same state of matter.**
This statement is likely **incorrect** unless the sample is explicitly mentioned to be a liquid (like water). In most calorimeter experiments involving solids (like a cube), the sample (solid) and water (liquid) are not in the same state of matter.
2. **B. The temperature measurement describes the average potential energy of the particles of matter in the cup system.**
This statement is somewhat confusing. Temperature is more directly related to the average kinetic energy of the particles rather than potential energy. Therefore, this statement can be considered **incorrect**.
3. **C. The reaction caused energy to be released into the surrounding water.**
This statement is **incorrect based on the temperature change**: since the final temperature is higher than the initial temperature, it indicates that the water absorbed energy from the reaction, which is a sign of an endothermic reaction or the absorption of heat rather than a release of heat.
Given the instructions to select three statements, it appears that not all statements can be confirmed as correct based on the information provided. However, if you require a correction to the given options or additional context to understand the calorimetry experiment fully, please provide that guidance.
It seems like there is a misunderstanding in terms of your selection of statements. Here’s what should have been evaluated:
- **C** is indeed **incorrect** as the system absorbed energy from the reaction.
- Thus, for a set of three statements, we might need different options, because A, B, and C are not accurate in the context provided.
Please provide further options or clarify the parameters if possible!