Answer:

1. Material become useful when it is used in limit but fan material is used in excess it is harmful for both humans and environment.

2.Materials are considered useful when it serves a purpose. These materials may have properties such as durability, resistance to water, heat, or acid, flexibility, elasticity and hardness. Some useful materials can also be reused, take for example, a container for any solid or liquid material.

3.One of the best uses for empty chemical containers is to reuse whenever it is possible or appropriate. Old containers can be used for water storage collection or to dispose of spill residue. These containers should not be used for any radioactive waste storage or disposal.

4.Toxic materials are substances that may cause harm to an individual if it enters the body. Toxic materials may enter the body in different ways. These ways are called the route of exposure. The most common route of exposure is through inhalation (breathing it into the lungs).

5.There are a number of very toxic materials that may be used in workplaces. Some examples include carbon monoxide, hydrogen sulfide, chlorine and sodium cyanide. Extreme care and caution must be used if there is potential for any form of exposure to very toxic materials.

Explanation:

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