| Difficulty | Secondary School | High school/other |
| ★ | Basic | Easy |
| ★★ | Demanding | Basic |
| ★★★ | Demanding | |
| ★★★★ | Difficult | |
| ★★★★★ | Very difficult |
How much does the measured final temperature differ from the theoretically predicted final temperature (in degrees)?
Answer: $-0{,}3\ °C$; Note: Calculating the formula $m_1c∆t_1=m_2c∆t_2$, the final temperature should be about $40{,}72\ °C$ and the difference in degrees about $-0{,}2\ °C$