Question

Determine whether each process is endothermic or exothermic.(3 points)
Endothermic Exothermic
a fire (the system is the fire)


a car engine (the system is the engine)


a melting ice sculpture (the ice is the system)

Answer 1

To determine whether each process is endothermic or exothermic, we need to consider the energy transfer and changes involved in each process:

1. **A fire (the system is the fire)**:
- This process is **exothermic**. A fire releases energy in the form of heat and light as it burns fuel, indicating that energy is being released to the surroundings.

2. **A car engine (the system is the engine)**:
- This process is also **exothermic**. A car engine converts chemical energy from fuel into mechanical energy, producing heat as a byproduct. The combustion of fuel releases energy, which raises the temperature of the engine and its components.

3. **A melting ice sculpture (the ice is the system)**:
- This process is **endothermic**. Melting involves absorbing heat from the surroundings to change the solid (ice) to a liquid (water). The ice takes in energy to overcome the forces holding its molecules in a solid state.

Here's a summary:

- **Endothermic**: Melting ice sculpture
- **Exothermic**: Fire, Car engine