Chapter U5, Problem 2RE

Interpretation Introduction

Interpretation: The energy needs of us are satisfied by chemical changes needs to be described.

Concept introduction: Energy combined with fires has many uses like heating home, cooking food, and moving cars.

Answer to Problem 2RE

A plant needs energy from the Sun to grow. Energy from flowing water makes waterwheel turn round.

Explanation of Solution

Fire is central to lives. Most familiar fires are oil, and gas fires, oil, wood, etc. Brilliant flames leap into air and the flame is intense heat when these substances are ignited.

A plant needs energy from the Sun to grow. Energy from flowing water makes waterwheel turn round. To continue running an athlete eats a snack bar for energy. A campfire supply energy to heat water. Electrical energy originate filament in light bulb to glow.

Conclusion

Fire releases energy from combustion reaction. Fire can be stopped whenever product of combustion reaction ${\text{CO}}_{\text{2}}$ is supplies in access.