Experiment On Specific Heat Capacity Flashcards
(15 cards)
What is specific heat capacity?
Specific heat capacity is the amount of heat required to raise the temperature of 1 kg of a substance by 1°C (or 1 K).
What is the formula for calculating specific heat capacity using the electrical method?
c = \frac{IVt}{m(\theta_2 - \theta_1)}
Where:
- I: Current (in Amperes)
- V: Voltage (in Volts)
- t: Time (in seconds)
- m: Mass of the liquid (in kg)
- \theta: Temperature change
What are the key pieces of equipment used in the electrical method experiment?
Plastic container, heating coil, thermometer, stirrer, ammeter, voltmeter, and rheostat.
Why is the liquid stirred during the experiment?
To ensure even distribution of heat throughout the liquid.
How is heat supplied to the liquid in the electrical method experiment?
Heat is supplied by the heating coil, which is powered by an electrical circuit.
What are some sources of error in the electrical method experiment?
Heat lost to the surroundings, heat absorbed by the container, and inaccurate temperature readings.
What is the principle behind the method of mixtures?
Heat lost by the hot substance is equal to the heat gained by the cold substance, assuming no heat is lost to the surroundings.
Why is the solid heated before mixing it with water?
To ensure the solid reaches a known high temperature.
Why is an insulated container used in the method of mixtures?
To minimize heat loss to the surroundings.
What formula is used to calculate the specific heat capacity of a solid in the method of mixtures?
m_s c_s (\theta_s - \theta_f) = m_w c_w (\theta_f - \theta_w)
Where:
- m_s: Mass of the solid
- c_s: Specific heat capacity of the solid
- m_w: Mass of the water
- c_w: Specific heat capacity of water
- \theta_s, \theta_w, \theta_f: Initial temperatures of the solid, water, and final temperature
Why is stirring important in the method of mixtures experiment for solids?
To ensure uniform temperature mixing between the solid and water.
How do you set up the experiment to determine the specific heat capacity of a liquid using the method of mixtures?
Heat a known mass of water to a high temperature, add it to a known mass of cooler liquid in an insulated container, stir, and measure the final temperature.
What formula is used to calculate the specific heat capacity of a liquid in the method of mixtures?
m_h c_h (\theta_h - \theta_f) = m_c c_c (\theta_f - \theta_c)
Where:
- m_h: Mass of hot water
- c_h: Specific heat capacity of water
- m_c: Mass of cool liquid
- c_c: Specific heat capacity of the liquid
- \theta_h, \theta_c, \theta_f: Initial temperatures of the hot water, cool liquid, and final temperature
Why is it important to account for heat loss in these experiments?
Heat loss to the surroundings can affect the accuracy of the results and lead to an underestimation of specific heat capacity.
How can heat loss be reduced in specific heat capacity experiments?
Use an insulated container, minimize time between heating and mixing, and pre-cool or pre-heat components as needed.
