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JC Science > Chapter 24 - Metals & Non-metals > Flashcards

Chapter 24 - Metals & Non-metals Flashcards

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1
Q

What are the properties of metals?

A 
○Conduct electricity
○Malleable
○Shiny
○Sonorous
○Ductile
○Hard and strong
○Conduct heat
○High density
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2
Q

What are some of the exceptions to the properties of metals?

A

○Alkali metals are soft with low densities

○Mercury is liquid at room temperature

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3
Q

What are the properties of non-metals?

A 
○Usually liquids or gases
○Brittle
○Low melting points
○Poor conductors of electricity
○Poor heat conductors
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4
Q

What are some of the exceptions to the properties of non-metals?

A

○Carbon in the form of graphite is a good conductor of electricity
○Carbon in the form of diamonds is extremely hard with high melting point

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5
Q

Alloy

A

A mixture of metals

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6
Q

What is the composition of brass and what is it used for?

A

Copper + zinc

Musical instruments, ornaments

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7
Q

What is the composition of bronze and what is it used for?

A

Copper + tin

Statues

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8
Q

What is the composition of solder and what is it used for?

A

Lead + tin

Soldering

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9
Q

What is the composition of mild steel and what is it used for?

A

Iron + carbon

Building reinforcements

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10
Q

What is the composition of stainless steel and what is it used for?

A

Iron + chromium + nickel

Knives, sinks

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11
Q

What is the composition of alnico and what is it used for?

A

Aluminium + nickel + cobalt

Powerful magnets

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12
Q

Rusting

A

corrosion of iron

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13
Q

How does rusting occur?

A

Iron/steel reacts with both water and oxygen and forms iron oxide/rust.

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14
Q

What affect does rust have on metal?

A

This orange/brown substance flakes away and eventually all the metal is corroded

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15
Q

What condition is necessary for rusting to occur?

A

In order for rusting to occur, both water and oxygen must be present

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16
Q

Give 5 methods of rust prevention

A 
Painting
Plastic coating
Greasing
Tin plating
Galvanising
17
Q

What is galvanising?

A

Coating iron/steel with zinc to prevent it rusting

18
Q

Place magnesium, copper, calcium and zinc in order of reactivity, starting with the most reactive

A

Calcium
Magnesium
Zinc
Copper

19
Q

What gas is produced when calcium reacts with water?

A

Hydrogen gas

20
Q

What gas is produced when calcium, magnesium and zinc react with hydrochloric acid?

A

Hydrogen gas

JC Science (44 decks)

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