Quiz for lecture 3: the secrets of porcelain

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In the phase diagram with three immiscible components, during the cooling of a melt with (h) composition, which is the first component that solidify?

2 points

They all solidify at the same time

Clear selection

Fumed silica is obtained by chemical reaction at high temperatures of:

2 points

Silicon chloride and oxygen

Magnesium chloride and calbonic anhydride

Calcium chloride and water

Silicon nitride and oxygen

Clear selection

Which is the mechanism that let some clay material to capture polluting ions?

2 points

Ionic wash

Swelling

ionic exchange

Ionic release

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What is the role of quartz in the composition of porcelain?

2 points

Limits shrinkage of drying and cooking

Increases the plasticity of raw materials

Makes the object more malleable

Does not alter the porosity of the object

Clear selection

Which one of the following is not a silicate mineral?

2 points

Sorosilicate

Orthosilicate (Sic8h20o4)

Nesosilicate

Cyclosilicate

Clear selection

Cognome e nome

What are the three main precursors for the production of porcelain?

2 points

Kaolin, quartz, zirconia

Titanium, alumina, silica

Kaolin, bentolite, quartz

Kaolin, feldspar, quartz

Clear selection

Talc, the main component of cosmetics, is a:

2 points

Tectosilicate

Phyllosilicate electrically charged

Nesosilicate

Philosilicate electrically discharged

Clear selection

In the phase diagram with three immiscible components, during the cooling of a melt with (h) composition, which is the last component that solidify?

2 points

They all solidify at the same time

Clear selection

Which silicate families have isolated cluster of two tetrahedra?

2 points

Sorosilicates and filosilicates

Sorosilicates

Philosilicates and inosiliates

Cyclosilicates and inosilicates

Clear selection

Kaolin is a philosilicate with a structure:

2 points

TOT+water+TOT

TOT

TO+water+TO

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What do you get if you heat the α-quartz between 870°C and 1470°C and cool again to room temperature?

2 points

α-tridymite

β-cristobalite

α-quartz

β-tridymite

Clear selection

Matricola

Who first produced porcelain?

2 points

English

Chinese

Indian

Korean

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By heating the α-quartz up to 1630 º C and cooling again down to room temperature, what is obtained?

2 points

β-tridymite

α-crystobalite

α-tridymite

α-quartz

Clear selection

Given its particular structure, silica microporous gel, is used as

2 points

Humidity dryer

Abrasive and polishing powder

pH detector in substances

Additive in common kitchen paper rolls (absorbent)

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By heating the α-quartz up to 850 º C and cooling again down to room temperature, what is obtained?

2 points

α-tridymite

β-tridymite

α-quartz

α-crystobalite

Clear selection

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