Find all the nonspecific usage of lexical units refers these sentences to the scientific style.

1. Metals are sometimes described as an arrangement of positive ions surrounded by a sea of delocalized electrons.

2. This definition opens up the category for metallic polymers and other organic metals. These synthetic materials often have the characteristic silvery gray reflectiveness(luster) of elemental metals.

3. Metals in general have high electrical conductivity which depends on their valency of ions, thermal conductivity, luster and density, and the ability to be deformed under stress without cleaving.

4. Some minerals exhibit unusual optical phenomena, such as asterism (the display of a star-shaped luminous area) or chatoyancy (the display of luminous bands, which appear to move as the specimen is rotated).

5. The transition metals (such as iron, copper, zinc, and nickel) take much longer to oxidize.

6. These filters adapt easily to automatic processing of many materials.

7. Most modern currencies are fiat currency, allowing the coins to be made of base metal.

Find all the syntactic and grammatical features of the text given below to classify it as scientific one.

Sheets of glass, which are obviously flat and thin, are called float glass. This refers to the manufacturing technique where molten glass is floated on molten tin, to produce flat sheets. Usually, after floated glass has been formed, it’s annealed – it’s left to cool slowly. But if it is left in this state, and the glass later gets broken, it breaks into dangerous, sharp pieces. So, for most engineering and architectural uses, annealed glass is unsuitable. We need to use what we call safety glass.

One type of safety glass is toughened glass, also called tempered glass. As the term suggests, the glass is tempered – it is heated and kept hot for a certain time, to change its structure. Then, if tempered glass is broken, it shatters – it breaks into tiny pieces. These are a lot safer than the long sharp pieces produced when annealed glass breaks.

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