Thermochemistry Assessment

Front

What does the first law of thermodynamics state?

Back

The first law of thermodynamics states that the change in internal energy (ΔE) of a system is equal to the amount of thermal energy transferred (q) plus the amount of work done (w): ΔE = q + w.

Front

What is an exothermic process?

Back

An exothermic process is a reaction or change that releases energy, usually in the form of heat, to its surroundings. Example: freezing snow.

Front

What happens to energy when a cold block of aluminum is placed in warmer water?

Back

The block of aluminum absorbs the energy that the water releases, leading to a temperature change in both substances.

Front

How do you calculate the specific heat of a substance?

Back

Specific heat (c) can be calculated using the formula: c = (m_water * c_water * ΔT_water) / (m_alloy * ΔT_alloy), where m is mass and ΔT is the change in temperature.

Front

What is the specific heat of water?

Back

The specific heat of water is approximately 4.18 J⋅g⁻¹⋅°C⁻¹.

Front

What is an endothermic process?

Back

An endothermic process is a reaction or change that absorbs energy from its surroundings. Example: liquid water evaporating to form water vapor.

Front

What is thermal energy?

Back

Thermal energy is the total kinetic energy of particles in a substance, which is related to temperature.

Front

What is the relationship between heat and temperature?

Back

Heat is the energy transferred between substances due to a temperature difference, while temperature is a measure of the average kinetic energy of particles.

Front

What is the significance of an insulated system in thermochemistry?

Back

An insulated system prevents heat exchange with the surroundings, allowing for accurate measurement of energy changes within the system.

Front

What is the formula for calculating work done in thermodynamics?

Back

Work (w) can be calculated using the formula: w = -PΔV, where P is pressure and ΔV is the change in volume.