Chem 100
Quiz 3
Provide the missing name and symbol for the elements below.
The air around us is mainly a mixture of two elements. The major component of air is
- _________________________ (symbol _____).
About 20% of the air is the gas we must breathe to stay alive:
- _________________________ (symbol _____).
Both gases exist as diatomic molecules so we write their molecular formulas as ____ and ____.
The surface of the earth is about 70% water, a compound formed from the elements
- _________________________ (symbol _____) and
- _________________________ (symbol _____)
- The chemical formula for water is ________________.
The bright metal that most societies have associated with wealth is
- _________________________ (symbol _____).
It was found as ornamentation and religious artifacts in the tombs of ancient Egypt and Incan ruis in Peru. It's still an important form of "money." (Over 110 tons of the metal now lies in vaults buried in rubble at the base of the World Trade Towers in New York City.)
There is one country in South America, ______________________ , that was named for the element Silver.
The Stone Age was followed by the
Bronze Age. This occured following the discovery of ways to reduce ores to form the metal
- _________________________ (symbol _____).
- Bronze is not an element, but rather an ___________ containing several metallic elements.
The Romans (100 AD) were experts in the manufacture of water pipes from the metallic element
- ___________________________ (symbol ____.)
- Their history of plumbing from this metal is still with us in the words Plumbers and Plumbing
We tend to think of metals are hard, strong, stiff materials that are useful for builing cars and forks or electrical wires.
- several elements are much too
reactive-- they react violently with water. One such metal is
- _________________________ (symbol _____)
- another element melts at a temperature below the freezing point of water. This
metal is a liquid at room temperature
- _________________________ (symbol _____)
Answers are available at answers_quiz3
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