The main raw material for manufacturing flat glass is sand (silicon dioxide, also called silica). However, two other materials?sodium oxide, and lime (calcium oxide)?are added to silica. What are their roles?

What will be an ideal response?


Sodium oxide lowers the meting point of sand and also makes molten sand more workable, i.e., less tacky. Lime
increases the durability of glass by making it more resistant to chemicals.

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Answer the following statement true (T) or false (F)

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Electrons located in the outer shell of an atom are known as ____ electrons.

a. magnetic b. orbit c. nuclear d. valence

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When a capacitor is added to an AC circuit, the voltage wave form will ________ the current wave form, which provides additional torque to a motor if it is connected to the circuit

A) lead B) lag C) remains in phase with

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