Question
Which of the materials would she place in her plastic bag to make a heat pack? Choose two of the 4 answers.
A.
Calcium chloride and water
B.
Vinegar and baking soda
C.
Citric acid solutions and baking soda
D.
Laundry detergent and water
E.
Ammonia chloride and water
A.
Calcium chloride and water
B.
Vinegar and baking soda
C.
Citric acid solutions and baking soda
D.
Laundry detergent and water
E.
Ammonia chloride and water
Answers
GPT-4o mini
To make a heat pack, you would typically want to choose materials that undergo an exothermic reaction, releasing heat when combined. Based on the options given:
A. **Calcium chloride and water** - When dissolved in water, calcium chloride releases heat, making it a good choice for a heat pack.
E. **Ammonium chloride and water** - When dissolved in water, ammonium chloride absorbs heat, resulting in a cooling effect rather than a warming one.
Based on this reasoning, the best choices are:
**A. Calcium chloride and water**
**C. Citric acid solutions and baking soda** (this combination can also produce heat, but the reaction and heat generation can vary based on concentration and other factors)
Thus, the primary choice for effective heat generation is:
**A. Calcium chloride and water**
**C. Citric acid solutions and baking soda**
If you need to choose only two that are most effective and common for a heat pack, stick with **A** and consider **E**, which also yields some heat but less effectively than **A**.
A. **Calcium chloride and water** - When dissolved in water, calcium chloride releases heat, making it a good choice for a heat pack.
E. **Ammonium chloride and water** - When dissolved in water, ammonium chloride absorbs heat, resulting in a cooling effect rather than a warming one.
Based on this reasoning, the best choices are:
**A. Calcium chloride and water**
**C. Citric acid solutions and baking soda** (this combination can also produce heat, but the reaction and heat generation can vary based on concentration and other factors)
Thus, the primary choice for effective heat generation is:
**A. Calcium chloride and water**
**C. Citric acid solutions and baking soda**
If you need to choose only two that are most effective and common for a heat pack, stick with **A** and consider **E**, which also yields some heat but less effectively than **A**.