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Materials & Substances — Lesson 2
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عيّنة
log
a segment of the trunk of a tree when stripped of branches
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acid
ˈæsɪd
any of various water-soluble compounds having a sour taste and capable of turning litmus red and reacting with a base to form a salt
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aluminum
əˈluːmɪnəm
a silvery ductile metallic element found primarily in bauxite
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bronze
brɑːnz
an alloy of copper and tin and sometimes other elements; also any copper-base alloy containing other elements in place of tin
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builder
a substance added to soaps or detergents to increase their cleansing action
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carbohydrate
ˌkɑrbəˈhaɪdreɪt
an essential structural component of living cells and source of energy for animals; includes simple sugars with small molecules as well as macromolecular substances; are classified according to the number of monosaccharide groups they contain
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carbon
ˈkɑrbən
an abundant nonmetallic tetravalent element occurring in three allotropic forms: amorphous carbon and graphite and diamond; occurs in all organic compounds
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cardboard
ˈkɑːrd.bɔːrd
a stiff moderately thick paper
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cement
sɪˈment
concrete pavement is sometimes referred to as cement
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chemical
ˈkemɪkəl
material produced by or used in a reaction involving changes in atoms or molecules
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clay
kleɪ
a very fine-grained soil that is plastic when moist but hard when fired
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copper
ˈkɑːpər
a ductile malleable reddish-brown corrosion-resistant diamagnetic metallic element; occurs in various minerals but is the only metal that occurs abundantly in large masses; used as an electrical and thermal conductor
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