Question

suppose you need to build a raft to cross a fast-moving river. describe the physical and chemical properties of the raft that would be important to ensure your safety.

Answer 1

The physical properties of a raft for crossing a fast-moving river include buoyancy, stability, and durability. The chemical properties include water resistance and non-toxicity.

Step-by-step explanation:

When building a raft to cross a fast-moving river, there are physical and chemical properties that are important to ensure your safety.

Physical properties include:

1. Buoyancy: The raft should be buoyant enough to float on the water and support the weight of the occupants.
2. Stability: The raft should have a balanced design to prevent tipping over in the strong current.
3. Durability: The raft should be made of strong and sturdy materials that can withstand the force of the water.

Chemical properties:

1. Water resistance: The materials used to build the raft should be resistant to water absorption and degradation.
2. Non-toxicity: The raft should not contain harmful chemicals that could pose health risks to the occupants.

Answer 2

you need a density less than water enough strength not to bend or break