Intermediate 2 Chemistry Unit 3(c)

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Presentation transcript:

Intermediate 2 Chemistry Unit 3(c) Metals Intermediate 2 Chemistry Unit 3(c)

True or False All metals conduct electricity All metals are shiny All metals have high melting points There are only two metal elements which are not silver in colour All metals have high densities

Gold

Silver

Nickel

Sodium

Mercury

Bronze

Questions about metals Why are metals important? Where do metals come from? Which metal is the most common on Earth? How reactive are metals? What physical properties do metals have?

Physical properties of metals Property Details State All solid at room temperature except Hg Group 1 and 2 metals have low mp compared to Transition metals Electrical conductivity All conduct when solid or liquid Thermal conductivity All are good thermal conductors Malleability All are malleable Density Compare Groups 1, 2 and Transition metals in Data Booklet

What makes metals different? Why is gold used in jewellery but copper is not? Why is iron used in construction? Why is aluminium used in electrical cabling and aircrafts? Why is sodium not used in construction? Why are steel and bronze not included in the Periodic Table

Reactions of metals Metal + Oxygen Metal + Water Metal + Acid 3 important reactions of metals: Metal + Oxygen Metal oxide Metal + Water Metal hydroxide + hydrogen Metal + Acid Salt + hydrogen

Practice Write as a word equation, chemical equation, balance, add state symbols: Sodium + water Magnesium + nitric acid Aluminium + oxygen Iron + hydrochloric acid Calcium + water

Reactivity Series Metals are not all equally reactive The less reactive metals are found uncombined (i.e. as the free element) in the earth’s crust The more reactive metals are found combined (i.e. as a compound) called an ore To get the metal element it must be extracted from the ore by a chemical reaction

Ores