Chap 24: Metals and Non-metals

Question 1

Properties of metals

Answer 1

• Shiny
• solid at room temp.(except Mercury)
• malleable (hammered into shape)
• ductile (wire)
• dense, sinks in water (except alkali metals)
• high melting points
• good conductors of heat
• good conductors of electricity
• corrosive (reacts with oxygen)

Question 2

Properties of non-metals

Answer 2

Poor heat conductors
Usually liquids and gases
Brittle (in a solid state)
Low melting points
Poor electrical conductors

Question 3

What does corrosion mean?

Answer 3

A reaction in which a metal slowly reacts with oxygen in the air to form an oxide

Question 4

What is rusting?

Answer 4

Iron corrosion

Question 5

How can you prevent corrosion?

Answer 5

Painting
Greasing
Galvanizing
Chromium plating

Question 6

What is bronze an alloy of and what is it used for?

Answer 6

Copper and tin

Statues

Question 7

What is brass an alloy of and what is it used for?

Answer 7

Copper and Zinc

Musical instruments

Question 8

What is steel an alloy of and what is it used for?

Answer 8

Iron and chromium

Question 9

What is solder an alloy of and what is it used for?

Answer 9

Tin and lead

Soldering

Question 10

What gas is produced when Calcium(/magnesium/Zinc/Copper) reacts with water(/hydrochloric) acid?

Answer 10

Hydrogen gas

Question 11

What are the four metals in decreasing order of reactivity?

Answer 11

Calcium
Magnesium
Zinc
Copper