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Questions and Answers
Which metal is found in the free state in the earth's crust?
Which metal is found in the free state in the earth's crust?
- Magnesium
- Aluminum
- Iron
- Gold (correct)
Why are the ores of many metals oxides?
Why are the ores of many metals oxides?
- Because oxygen is a very reactive element and is abundant on the earth (correct)
- Because oxygen is a very reactive element and is scarce on the earth
- Because oxygen is a very stable element and is scarce on the earth
- Because oxygen is a very unreactive element and is abundant on the earth
Which metal is never found in nature as a free element?
Which metal is never found in nature as a free element?
- Sodium (correct)
- Silver
- Iron
- Copper
In what form are the moderately reactive metals found in the earth's crust?
In what form are the moderately reactive metals found in the earth's crust?
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Which metal is found in the earth's crust in the combined state as sulphide or oxide ores?
Which metal is found in the earth's crust in the combined state as sulphide or oxide ores?
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Study Notes
Metals in the Earth's Crust
- Copper is found in the free state in the earth's crust.
Metal Ores
- Many metals are found as oxides in their ores because oxygen is abundant in the earth's crust and readily combines with metals.
Metal Properties
- Mercury is never found in nature as a free element.
Reactive Metals
- Moderately reactive metals are found in the earth's crust in the form of compounds such as sulphides, oxides, or carbonates.
Metal Ores (continued)
- Zinc, lead, copper, and nickel are found in the earth's crust in the combined state as sulphide or oxide ores.
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