Metals and Their Uses
What percentage of the Periodic Table elements are metals?
80
What is the corrosion of iron called?
rusting
What are ores?
Compounds of metals with nonmetals.
Name the areas where metals are used in modern life.
Electronics, cars, rockets, machines, or construction.
What causes corrosion?
Chemical reactions with water, oxygen, acids, or microorganisms.
What process is used to get metals from ores?
Smelting
Which metal strengthens bones and teeth?
Calcium.
How can people prevent corrosion?
By making alloys, coatings, or painting.
Which metals can be found free in nature?
Less active ones like gold or platinum.
Which metal is found in blood?
Fe
What happened to the Boeing 737 in 1988?
The front part was ripped away because of metal corrosion.
Which nonmetals can combine with metals to form ores?
Oxygen, hydrogen, sulfur, carbon, and others.
Why are metals important for plants?
Magnesium is part of chlorophyll, helping plants photosynthesize.
Why does corrosion occur after smelting?
Because smelted metals become unstable when exposed to water and oxygen.
Why was aluminium more expensive than gold in the 19th century?
Because it was very rare and hard to extract before modern methods.