Properties and Uses of Graphite

The video explores the properties of graphite, starting with its microscopic structure in pencil lead. It demonstrates how graphite marks paper and its excellent electrical conductivity, which is utilized in various applications like batteries. The video also highlights graphite's remarkable heat resistance, making it suitable for use in steel mills.

What is the primary purpose of using an electron microscope in the lab?

• To examine the graphite structure closely

• To magnify the entire pencil

• To test the pencil's durability

• To measure the weight of the pencil

What does the graphite in a pencil look like under high magnification?

• A liquid surface

• A flat plain

• A mountain range

• A smooth surface

How do the individual pieces of graphite create marks on paper?

• By melting onto the paper

• By chemically bonding with the paper

• By breaking off and sliding onto the paper

• By sticking due to static electricity

What is one of the special properties of graphite besides making marks on paper?

• It can float in the air

• It can change color

• It can conduct electricity

• It can dissolve in water

What happens when electricity is passed through graphite rods?

• They break apart

• They melt

• They change color

• They emit a bright light

In what common devices is graphite used due to its electrical properties?

• Microwave ovens

• Lithium-ion batteries

• Refrigerators

• Televisions

What happens to the wood of a pencil when heated compared to the graphite?

• Both wood and graphite incinerate

• The wood melts while graphite remains

• The wood incinerates while graphite remains

• The wood remains intact

What is the maximum temperature that graphite can withstand?

• 500 degrees Celsius

• 1000 degrees Celsius

• 2000 degrees Celsius

• Over 3000 degrees Celsius

Why is graphite used in steel mills?

• Because it is cheap

• Because it is lightweight

• Because it is heat resistant

• Because it is colorful

What happens to the graphite when the pencil wood is incinerated?

• Graphite changes color

• Graphite melts

• Graphite remains intact

• Graphite evaporates