Examkin

Soru

Zorluk: OrtaAnalyzing Experimental Procedures and Apparatus

A student performs an experiment to determine the specific heat capacity of an unknown solid alloy block using a water calorimeter. The apparatus includes a hot plate with a boiling water bath, an insulated calorimeter cup containing cool distilled water, a temperature probe, and a manual stirrer.

Based on standard experimental procedure, arrange the following steps in the correct chronological sequence from first to last:

  1. 1Measure the initial mass of the solid alloy block and submerge it in the boiling water bath until its temperature stabilizes at 100.0∘C100.0^\circ\text{C}.
  2. 2Measure and record the initial temperature of the cool distilled water inside the insulated calorimeter cup immediately prior to transfer.
  3. 3Rapidly transfer the heated alloy block from the boiling bath into the calorimeter cup and close the insulated lid.
  4. 4Gently stir the water inside the calorimeter and record the maximum equilibrium temperature reached by the mixture.

Cevap

The correct chronological order is: 1. Measure initial mass of the alloy block and submerge it in boiling water; 2. Record the initial temperature of the calorimeter water; 3. Rapidly transfer the heated block into the calorimeter cup; 4. Stir the water and record the maximum equilibrium temperature.
The correct procedure begins by preparing the sample by obtaining its mass and bringing it to a constant reference temperature (100.0∘C100.0^\circ\text{C}) in boiling water. Next, the initial temperature of the calorimeter water is recorded immediately before introducing the heated block. The block is then transferred quickly to minimize heat loss to surrounding room air. Finally, the mixture is stirred to ensure even heat distribution and the maximum stable temperature is recorded.

Adım Adım Çözüm

1
Establish the initial high temperature state of the solid alloy.
The block mass is measured, and its initial temperature reaches 100.0∘C100.0^\circ\text{C} in the boiling bath.
Knowing the precise initial temperature and mass of the sample is required to calculate total heat gained/lost (q=mcΔTq = mc\Delta T).
2
Measure the baseline state of the calorimeter liquid.
The initial temperature of the cool water in the calorimeter cup is documented.
Recording this temperature immediately before transfer avoids thermal drift errors from ambient room conditions.
3
Introduce the hot alloy sample into the cooler liquid environment.
The block is submerged into the water, and the cup is immediately sealed.
Rapid transfer minimizes heat loss to the room, ensuring heat transferred from the block equals heat absorbed by the water and cup.
4
Monitor thermal equilibrium.
Continuous stirring yields a uniform temperature reading, capturing the highest temperature reached.
Stirring prevents localized hot spots, ensuring accurate determination of final equilibrium temperature.

Anahtar Kavram

Calorimetric Experimental Sequence and Thermal Equilibrium
Bu soruyu puanla

Konular

Analyzing Experimental Procedures and Apparatus

Bu konudan daha fazla soru