Chemical Composition and Structure of Materials

What is the chemical composition of timber?

• Iron, copper, and zinc

• Carbon, hydrogen, and oxygen

• Cellulose, hemicellulose, and lignin

• Nitrogen, phosphorus, and potassium

What is the chemical composition of concrete?

• Cement, rocks, water

• Cement, sand, water

• Cement, gravel, water

• Cement, water, aggregates

What is the chemical composition of plastics?

• Silicon, nitrogen, oxygen

• Carbon, hydrogen, oxygen (and possibly other elements)

• Iron, carbon, nitrogen

• Hydrogen, helium, lithium

What is the chemical composition of metals?

• Metals are composed of water and air.

• Metals are composed of organic compounds.

• Metals are composed of non-metallic elements.

• Metals are composed of one or more metallic elements.

What is the structure of concrete?

• Concrete is a composite material made up of a mixture of cement, water, aggregates, and sometimes additives or admixtures.

• Concrete is a type of plastic.

• Concrete is a liquid material.

• Concrete is made up of wood and metal.

What are the main components of timber?

• sand, cement, and gravel

• oxygen, carbon, and hydrogen

• cellulose, hemicellulose, and lignin

• iron, steel, and aluminum

Which chemical compounds are commonly found in concrete?

• sand, gravel, rocks

• wood, plastic, metal

• oil, gasoline, diesel

• cement, water, aggregates, admixtures

What are the different types of plastics based on their chemical composition?

• thermoplastics, thermosetting plastics, and elastomers

• rubber, silicone, and polyurethane

• polyethylene, polypropylene, and polystyrene

• acrylic, nylon, and PVC

How do polymers contribute to the chemical composition of plastics?

• Polymers are used as additives in plastics.

• Polymers are the main component of plastics.

• Polymers are only a minor component of plastics.

• Polymers have no role in the chemical composition of plastics.

What are the properties of metals that make them suitable for various applications?

• Metals have low thermal and electrical conductivity, malleability, low strength, resistance to corrosion, and a narrow range of melting points.

• Metals have high thermal and electrical conductivity, malleability, ductility, high strength, resistance to corrosion, and a wide range of melting points.

• Metals have low thermal and electrical conductivity, malleability, ductility, low strength, resistance to corrosion, and a narrow range of melting points.

• Metals have low thermal and electrical conductivity, brittleness, low strength, susceptibility to corrosion, and a narrow range of melting points.