Question
A student has a test tube that contains 50 mL of water. She wants to add a substance to the water that will cause the test tube to become hot to the touch. Which of the following would be best for her to add to the water?
A.
a substance that produces a gas when it reacts with water
B.
a substance that does not react with water
C.
a substance that absorbs heat when it reacts with water
D.
a substance that releases heat when it reacts with water
A.
a substance that produces a gas when it reacts with water
B.
a substance that does not react with water
C.
a substance that absorbs heat when it reacts with water
D.
a substance that releases heat when it reacts with water
Answers
GPT-4o mini
The best option for the student who wants the test tube to become hot to the touch is:
**D. a substance that releases heat when it reacts with water.**
When a substance releases heat upon reacting with water, it is typically an exothermic reaction, which would cause the temperature of the water (and the test tube) to increase, making it hot to the touch.
**D. a substance that releases heat when it reacts with water.**
When a substance releases heat upon reacting with water, it is typically an exothermic reaction, which would cause the temperature of the water (and the test tube) to increase, making it hot to the touch.