Home › AP Chemistry › Chemistry › Thermochemistry › The energy needed to raise the temperature of wa…
The energy needed to raise the temperature of water depends on atmospheric pressure and on:
AThe colour of the pan
BThe time of measurement
CThe shape of the flask
DThe starting temperature
Answer & Solution
Correct answer: D. The starting temperature
1. A quoted heating requirement is only exact under stated conditions.
2. This quantity depends on the atmospheric pressure and the starting temperature of the water.
3. Both affect how much energy a given temperature rise actually needs.
4. Pan colour and flask shape change how fast heat arrives, not how much is required.
5. That is why calorimetry results are quoted with the conditions attached.
_Source: OpenStax Chemistry 2e (CC BY 4.0), Ch 5 'Thermochemistry', sections 5.1-5.3_
Related questions
The specific heat of a substance is usually treated as constant across a chapter's temperaA flask of water heated from 21 degrees Celsius to 85 degrees Celsius has absorbed heat, sHeating 800 grams of water by one degree Celsius requires how many times the energy neededCompared with chemical reactions, the energy changes in nuclear reactions are larger by a Increasing the thermal energy of a sample raises its temperature, provided that:In a bimetallic strip thermometer, brass and steel are paired because on heating:Most metals have specific heats that are:Solid water, that is ice, has a specific heat of about: