6/7 Basic Concepts in Chemistry and Material Structure

What are the types of material structure discussed in engineering?

• Crystalline and amorphous structures.

• Solid and liquid structures.

• Organic and inorganic structures.

• Natural and synthetic structures.

How are compounds classified?

• By their atomic number

• By their bonds: ionic, molecular, or metallic

• By their color

• By their melting point

What is an example of a compound representation?

• Na

• H

• NaCl

• O

How can compounds be separated?

• By physical means only

• By chemical reactions

• By freezing

• By boiling

Which of the following elements is a noble gas?

• Nitrogen (N)

• Oxygen (O)

• Argon (Ar)

• Carbon (C)

In covalent bonding, what happens to the electrons?

• They are transferred from one atom to another

• They are shared between two atoms

• They are lost to the environment

• They are absorbed by the nucleus

What is a key feature of crystalline structures?

• Random alignment

• Loosely bound

• Ordered alignment

• No defined edges

Which of the following describes an amorphous structure?

• Geometric shape

• Repeated pattern

• Tightly bound

• Non-crystalline structure

How are the molecules in a crystalline structure bound?

• Loosely bound

• Tightly bound

• No defined edges

• Random alignment

What is the dispersed phase in composite materials?

• The phase that provides color

• The phase that is embedded in the matrix

• The phase that is only made of metals

• The phase that dissolves in water