ΔT meaing
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In the context of physics and chemistry, ΔT typically refers to the change in temperature of a substance or system. It is represented by the Greek letter delta (Δ) followed by the variable T, which stands for temperature. ΔT is used to quantify how much the temperature of a substance has increased or decreased from an initial value.
200 g of water is heated in a copper calorimeter with a mass of 100 g. If the water has an initial temperature of 30 ºC and a final temperature of 40 ºC, calculate the heat energy absorbed by the water? The specific heat capacity of water is 4200 J/ kg °C.
To calculate the heat energy absorbed by the water, we can use the formula:
Q = mcΔT
Where:
Q = heat energy (in Joules)
m = mass of the substance (in kg)
c = specific heat capacity of the substance (in J/kg°C)
ΔT = change in temperature (in °C)
Given data:
mass of water, m = 200 g = 0.2 kg
specific heat capacity of water, c = 4200 J/kg°C
change in temperature, ΔT = 40°C - 30°C = 10°C
Now, substitute these values into the formula:
Q = (0.2 kg) * (4200 J/kg°C) * 10°C
Q = 8400 J
Therefore, the heat energy absorbed by the water is 8400 Joules.
Q = mcΔT
Where:
Q = heat energy (in Joules)
m = mass of the substance (in kg)
c = specific heat capacity of the substance (in J/kg°C)
ΔT = change in temperature (in °C)
Given data:
mass of water, m = 200 g = 0.2 kg
specific heat capacity of water, c = 4200 J/kg°C
change in temperature, ΔT = 40°C - 30°C = 10°C
Now, substitute these values into the formula:
Q = (0.2 kg) * (4200 J/kg°C) * 10°C
Q = 8400 J
Therefore, the heat energy absorbed by the water is 8400 Joules.
Calculate the heat energy required to increase the temperature of 200 g of copper by 15ºC. The specific heat capacity of copper is 390 J/ kg °C.
To calculate the heat energy required to increase the temperature of the copper, we can use the same formula as before:
Q = mcΔT
Given data:
mass of copper, m = 200 g = 0.2 kg
specific heat capacity of copper, c = 390 J/kg°C
change in temperature, ΔT = 15°C
Now, substitute these values into the formula:
Q = (0.2 kg) * (390 J/kg°C) * 15°C
Q = 1170 J
Therefore, the heat energy required to increase the temperature of 200 g of copper by 15°C is 1170 Joules.
Q = mcΔT
Given data:
mass of copper, m = 200 g = 0.2 kg
specific heat capacity of copper, c = 390 J/kg°C
change in temperature, ΔT = 15°C
Now, substitute these values into the formula:
Q = (0.2 kg) * (390 J/kg°C) * 15°C
Q = 1170 J
Therefore, the heat energy required to increase the temperature of 200 g of copper by 15°C is 1170 Joules.
The definition of temperature is:
1. The sum of the kinetic energies of the molecules in the substance
2. The average kinetic energy of molecules in the substance
3. The product of the kinetic energies of the molecules in the substance
1. The sum of the kinetic energies of the molecules in the substance
2. The average kinetic energy of molecules in the substance
3. The product of the kinetic energies of the molecules in the substance
2. The average kinetic energy of molecules in the substance