Quantity of Heat Flashcards
What is heat as a form of energy?
Heat is a form of energy that flows from a region of higher temperature to a region of lower temperature. It is transferred through conduction, convection, or radiation.
What is heat capacity?
Heat capacity is the amount of heat required to raise the temperature of a substance by one degree Celsius (or one Kelvin). It is a measure of the total heat required to change the temperature of the entire object or substance.
What is specific heat capacity?
Specific heat capacity is the amount of heat required to raise the temperature of one unit mass of a substance by one degree Celsius (or one Kelvin). It is a property that is specific to each substance and is given by:
𝑐 = 𝑄 / (𝑚 × Δ 𝑇)
where 𝑐 is the specific heat capacity,
𝑄 is the heat added,
𝑚 is the mass of the substance, and Δ𝑇 is the change in temperature.
How can heat capacity be determined using the method of mixtures?
The method of mixtures involves mixing substances at different temperatures and measuring the final equilibrium temperature. By applying the principle of conservation of energy, the heat lost by the hotter substance equals the heat gained by the cooler substance. This allows the calculation of heat capacity.
How can specific heat capacity be determined using the electrical method?
The electrical method involves using an electrical heater to supply a known amount of electrical energy to a substance. The rise in temperature is then measured. The specific heat capacity can be calculated using:
**𝑐 = 𝑃 × 𝑡 / 𝑚 Δ 𝑇 **
where 𝑃 is the power of the heater,
𝑡 is the time,
𝑚 is the mass of the substance, and Δ𝑇 is the change in temperature.
How can you differentiate between heat capacity and specific heat capacity?
Heat capacity is the total heat required to change the temperature of an entire object, while specific heat capacity is the heat required to change the temperature of a unit mass of a substance by one degree.
