Question
A student is studying chemical changes and adds a solid substance to a liquid substance. Which statement best describes what the student should observe if a chemical reaction is occurring?
The liquid is absorbed into the solid.
Smoke appears as the liquid contacts the solid.
The temperature of the solid remains the same.
The mass of the solid stays the same.
The liquid is absorbed into the solid.
Smoke appears as the liquid contacts the solid.
The temperature of the solid remains the same.
The mass of the solid stays the same.
Answers
GPT-4o mini
If a chemical reaction is occurring when a solid substance is added to a liquid substance, the statement that best describes what the student should observe is:
**Smoke appears as the liquid contacts the solid.**
This indicates that a chemical reaction is taking place, as smoke can suggest the production of gases or energy changes. The other options may not necessarily indicate a chemical reaction. For example, the liquid being absorbed or the mass of the solid staying the same could occur in physical changes, and the temperature of the solid remaining the same would not indicate a reaction either.
**Smoke appears as the liquid contacts the solid.**
This indicates that a chemical reaction is taking place, as smoke can suggest the production of gases or energy changes. The other options may not necessarily indicate a chemical reaction. For example, the liquid being absorbed or the mass of the solid staying the same could occur in physical changes, and the temperature of the solid remaining the same would not indicate a reaction either.