Wzorowane na: Chemistry HL Paper 1B, November 2025, TZ1, pytanie 2(b). Treść, dane i kontekst są zmienione; sprawdzane umiejętności, format i punktacja jak w oryginale.
Informacja do zadań 2a-2e.
A student was given a small block of an unknown metal and used calorimetry to identify it. The block, of mass 3.35 g, was kept in beaker A, which contained water held at 90.00 °C, until it had reached the temperature of the water. It was then transferred quickly into beaker B, which contained 6.25 g of water at 21.45 °C. The highest temperature reached by the water and the metal together in beaker B was 24.65 °C.
| Quantity | Value |
|---|
| Mass of the metal block / g | 3.35 |
| Temperature of the metal in beaker A / °C | 90.00 |
| Mass of water in beaker B / g | 6.25 |
| Temperature of the water in beaker B before the metal was added / °C | 21.45 |
| Highest temperature of water and metal in beaker B / °C | 24.65 |
Assume that the heat released by the metal is equal to the heat absorbed by the water in beaker B, calculated in 2a. Determine the specific heat capacity of the metal.
Use section 1 of the data booklet.
If you have no answer to 2a, take the heat transferred to be 80.0 J (this is not the correct value).
«» -65.35 «°C/K» ✔
«
M1: temperature change of the metal, -65.35 K (accept 65.35 K). M2: 0.382 J g-1 K-1. Award [2] for a correct final answer. Award [2] for 0.365 J g-1 K-1 if 80.0 J is used. Award [1] max for a negative value, -0.382 J g-1 K-1.
The temperature change of the metal is negative, and so is the heat it transfers; the specific heat capacity itself is a positive quantity.
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