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4-SKILLS Classifying & Sorting, Metals Part -I- (Author-Bouabdellah)




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 Technicum Si-Tarek Of Relizane

 SecondYear Students

Technical Streams 2004/2005

Practice: Classifying & Sorting, Metals -I-


A – Pre-reading Activities:
 
1-Vocabulary: Match each of the following words with its correct definition. Write the corresponding letter in the box provieded.
 
Words:
Definitions:
1-Mammals:
2-Reptiles:
3-Fish:
4-Birds:
5-Insects:
A - Hot-blooded egg-laying vertebrates that have feathers and wings and that can fly.
B - Any cold-blooded vertebrate.
C - Any of various mostly cold-blooded aquatic (water) vertebrates.
D - Small air-breathing invertebrate.
E - Any hot-blooded vertebrate having the skin more or less covered with hair and nourished with their mothers’ milk.
 
2-Picture Study:  Match each of these animals with its correct picture. Then say which family is it.
Names

NAME

PICTURE N°

FAMILY

 

NAME

PICTURE N°

FAMILY

Lady-bird

 

Seal

Parrot

 

Rabbit

Crocodile

 

Snake

Dog

 

Duck

Hen

 

Butterfly

Carp

 

Crab

Sheep

 

Cat

Tortoise

 

Be

 Animals Pictures
 
                    1      2     3       4      5     6      7        8
 
                             9    10     11      12      13      14      15     16
 
B –reading Activities:
 
Sixty of the hundred or so elements in the periodic table of the ele­ments, which make up all known matter, are classified as metals. The re­maining elements which include sulphur, chlorine, phosphorus or nitro­gen, are simply called non-metals.
The best known metallic elements are iron, copper, zinc, tin, lead, aluminum, nickel, cobalt, magnesium, gold, silver, platinum, tungsten, chro­mium, manganese and mercury. We can distinguish two groups of metals: ferrous metals and non-ferrous metals. The former contain mainly iron, but in the latter, the basic material is a metal other than iron.
Ferrous metals include cast iron; wrought iron and steels. There are se­veral different grades of steels. We can classify them according to their carbon content:
Low-carbon steels             0.07 - 0.15% carbon.
Mild-steels                         0.15 - 0.25% carbon.
Medium-carbon steels      0.25 - 0.50 % carbon.
High-carbon steels            0.50 - 1.40 % carbon.
Non-ferrous metals include copper, zinc, lead, tin, etc...
The physical properties of metals differ greatly, chiefly in density (com­parative weight) strength, hardness, elasticity, melting and boiling points under heat, and electrical and heat conductivity. In order to obtain the pro­perties desired, metals are often blended with other metals, or even with non-metals such as carbon or silicon. These blended metals are known as alloys. Non-ferrous alloys include brass which is made from copper and zinc and bronze which is made from copper and tin.
 
1-Vocabulary: Find in the text words that are close in meaning to  the following.
a – episodic         = 
b – thing               =
c – constituents    =
d – concentration =
e – hotness           =
 
2-True/False: Are these statements true or false according to the text. Correct the false ones.
a – Nitrogen and chlorine are non ferrous metals.
b – Iron is contained in brass and bronze.
c – Mercury is a non-ferrous metal.
d – There are 60 ferrous metals in nature.
 
3-Word reference: What do the underlined words in the text refer to?
a – which           ▬►
b – The former  ▬►
c – the latter      ▬►
d – their             ▬►
 
4-Comprehension: Answer the following questions according to the text.
a – How many elements make up the matter?
b – What is an alloy?                                        
c – In what way can we classify steels?          
 
5-Sum it up: Read the text again the complete the following diagram classifying the metals.
 
 
 
 
 
 
 
 
 
Matter
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Metals
 
 
 
 
 
 
 
Non-Metals
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Ferrous
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Wrought
Iron
 
 
Alloys
 
 
 
Pure Non-Ferrous
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Bronze
 
Tin