extraction of metals

What is a metal ore?

• A rock that contains enough of the metal to make it worthwhile extracting

• A type of metal that is chemically combined with other substances

• A metal that is highly resistant to oxidation

• A metal that is unreactive and found as the uncombined element

Why do unreactive metals not have to be extracted chemically?

• They are often found as the uncombined element

• They are highly reactive with other substances

• They are chemically unstable

• They are always in oxide form

What is the extraction method for higher placed metals in the reactivity series?

• Using a blast furnace

• Reacting with more reactive material

• Heating with carbon

• Electrolysis

What determines the method of extraction for metals?

• Position on the reactivity series

• Color of the metal

• Melting point of the metal

• Density of the metal

What are alloys?

• Metals that are highly reactive

• Pure metals extracted from ores

• Nonmetals combined with metals chemically

• Mixtures of metals physically combined but not chemically

What makes alloys harder than pure metals?

• Higher density

• Higher reactivity

• Different sizes of atoms preventing layers from sliding over each other

• Higher melting point

What is a common example of an alloy?

• Copper

• Platinum

• Gold

• Brass

What is the main property of alloys that can be different from the metals they contain?

• Higher reactivity

• Lower strength and hardness

• Lower resistance to corrosion

• Greater strength, hardness or resistance to corrosion or extreme temperatures

What is the extraction process for lower placed metals in the reactivity series?

• Using a blast furnace

• Electrolysis

• Heating with carbon

• Reacting with more reactive material

What is the main reason for the extraction of metals from their ores?

• To increase the reactivity of the metal

• To change the color of the metal

• To obtain enough of the metal to make it worthwhile

• To make the metal chemically unstable