What types of energy occurs when a grapefruit falls from a tree? TRUE OF FALSE: Combustion reactions occur in the presence of oxygen gas. * Energy is the ability to do work. * A renewable energy source is one that is replaceable. * Light energy is emitted by certain organisms such as fireflies and glow-worms. Sound energy cannot travel through air Heat energy cannot travel through a liquid for example water.

The energy conversions that occur when a grapefruit falls from a tree is;

Potential energy ---> kinetic energy ---> potential energy

Combustion reactions occur in the presence of oxygen gas- True

Energy is the ability to do work - True

A renewable energy source is one that is replaceable - True

Light energy is emitted by certain organisms such as fireflies and glow-worms - True

Sound energy cannot travel through air - False

Heat energy cannot travel through a liquid for example water - False

Explanation:

According to the first law of thermodynamics, energy can not be created nor destroyed but is converted from one form to another. When a grapefruit falls from a tree, the energy conversion is as follows;

Potential energy ---> kinetic energy ---> potential energy

Combustion reaction refers to a reaction where a substance is burnt in oxygen to produce heat and light.

Energy is defined in science as the ability to do work. Renewable energy can be replaced. A typical example is solar energy.

Light energy is emitted by certain organisms such as fireflies and glow-worms.

Sound is a mechanical wave hence it must be transmitted through a medium. The medium through which sound waves are transmitted is air.

Heat travels through any thermal conductor. Water is an example of a good thermal conductor. Heat indeed travels through different liquids.

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