Metals And Non Metals

Question 1

Explain malleable

Answer 1

Can be hammered into shape

Question 2

Explain ductile

Answer 2

Can be stretched out into thin wires

Question 3

Give 5 properties of non metals

Answer 3

Usually liquids or gas
Poor heat conductors
Brittle(in the solid state)
Poor electrical conductors
Low melting points

Question 4

Explain corrosion

Answer 4

A reaction in which a metal slowly reacts with oxygen in the air and water is present to from an oxide

Question 5

Explain rust and how it’s formed

Answer 5

Rust is iron corrosion only. Iron in the presence of water combines slowly with oxygen in the air the form rust (iron oxide)

Question 6

How is corrosion prevented

Answer 6

Covering the metal with some material so as to prevent water and air making contact with it.

Question 7

Give four ways to prevent corrosion(and examples)

Answer 7

Painting(bike, ships)
Greasing/oiling (moving parts in machinery)
Galvanising ( coat with a large layer of zinc)
Chromium plating (coat with a shiny layer of chromium)-taps, towel rack

Question 8

Explain what is in each test tube for the experiment to investigate that oxygen and water are needed for rusting to occur

Answer 8

Test tube 1: calcium chloride absorbs moisture in test tube. Nail is placed inside and cork on top. No water- no rusting

Test tube 2: boiling water removes oxygen and the oil on top prevents oxygen from the air getting into the tube, nail is placed in tube. No oxygen- no rusting

Test tube 3: oxygen and water are present- rusting occurs

Question 9

Give 8 properties of metals and any exceptions

Answer 9

Shiny
Solid( except Mercury )
Malleable
Ductile
Very dense-sink in water ( except alkali metals) 
High melting points
Good conductors of heat and electricity
Corrosive-react with oxygen

Question 10

Explain an alloy

Answer 10

An alloy is a mixture of two or more metals.

Question 11

Give four examples of alloys

Answer 11

Brass- copper and zinc- musical instruments
Bronze- tin and copper -statues
Steel- iron and chromium- buildings
Solder- tin and lead- soldering

Question 12

Name the four metals used in the to compare the reactivity of four metals with dilute acid in order of decreasing reactivity. Also state the sentence that helps you to remember the metals

Answer 12

Calcium magnesium zinc copper

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