Thermochemical Calculations: q=mCΔT 24-25

Front

What is the formula for calculating heat transfer in thermochemical calculations?

Back

q = mCΔT, where q is the heat absorbed or released, m is the mass, C is the specific heat capacity, and ΔT is the change in temperature.

Front

In thermodynamics, what does the term 'specific heat capacity' mean?

Back

Specific heat capacity is the amount of heat required to raise the temperature of 1 gram of a substance by 1 degree Celsius.

Front

What direction does heat flow between two substances at different temperatures?

Back

Heat flows from the substance with a higher temperature to the substance with a lower temperature.

Front

If two substances of equal mass absorb the same amount of heat but have different temperature changes, what can be inferred about their specific heat capacities?

Back

The substance that experiences a smaller temperature change has a higher specific heat capacity.

Front

How do you calculate the specific heat capacity of a substance?

Back

Specific heat capacity (C) can be calculated using the formula C = q / (mΔT), where q is the heat absorbed, m is the mass, and ΔT is the change in temperature.

Front

What is the specific heat capacity of water?

Back

The specific heat capacity of water is approximately 4.18 J/g°C.

Front

What happens to the temperature of a substance when it absorbs heat?

Back

The temperature of the substance increases as it absorbs heat, assuming no phase change occurs.

Front

What is the significance of the calorimeter in thermochemical experiments?

Back

A calorimeter is used to measure the heat transfer during chemical reactions or physical changes.

Front

If a 120g metal at 220°C is placed in water at 25°C, which way will heat flow?

Back

Heat will flow from the metal to the water because the metal has a higher temperature.

Front

What is the relationship between mass, specific heat capacity, and temperature change in heat transfer?

Back

The amount of heat transferred is directly proportional to the mass of the substance, its specific heat capacity, and the temperature change.