English Exercises: 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:

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1-Vocabulary: Match each of the following words with its correct definition. Write the corresponding letter in the box provieded.

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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.

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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

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�� 1�� 2�� 3�� 4�� 5�� 6�� 7�� 8
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��9��10��11��12�� 13�� 14��15��16

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B �reading Activities:

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Sixty of the hundred or so elements in the periodic table of the ele�ments, which make up all known matter, are classified as metals. The re�maining elements which include sulphur, chlorine, phosphorus or nitro�gen, are simply called non-metals.

The best known metallic elements are iron, copper, zinc, tin, lead, aluminum, nickel, cobalt, magnesium, gold, silver, platinum, tungsten, chro�mium, 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 se�veral 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 (com�parative weight) strength, hardness, elasticity, melting and boiling points under heat, and electrical and heat conductivity. In order to obtain the pro�perties 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.

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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��=

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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.

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3-Word reference: What do the underlined words in the text refer to?

a � which�� ▬►

b � The former� ▬►

c � the latter�� ▬►

d � their�� ▬►

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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?��

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5-Sum it up: Read the text again the complete the following diagram classifying the metals.

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Matter

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Metals

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Non-Metals

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Ferrous

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Wrought

Iron

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Alloys

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Pure Non-Ferrous

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Bronze

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Tin

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