Chemistry, 21.02.2020 03:33, taylord4230

The terms vitrification, oxidation, water smoking, and flashing are all associated with: Select one: Select one:
a. spanning openings with bricks or other masonry units.
b. cleaning bricks after masons install them.
c. chemical processes involved in mortar hydration.
d. firing bricks in a kiln.
e. chemical reactions during the installation of foamed-in-place insulation.

Answers: 3

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answered: EricaCox1

Answer is option D.

The terms vitrification, oxidation, water smoking, and flashing are all associated with firing bricks in a kiln.

Explanation:

Brick is one of the building materials made from the clay. The manufacturing process of brick include;

1) Winning - It is the process of mining of clay and its transportation to the manufacturing site.

2) Preparation - It includes the crushing and grinding of clay and later mixing them into a uniform raw material.

3) Forming/Molding - It is the process of mixing water with the clay mix and mold it into the desired shape. The plasticity of the clay depends on the amount of water used.

4) Drying - The process of removing the moisture from wet clay by drying it through evaporation.

5) Firing and Cooling - Firing is the process of burning the clay in a kiln and it usually requires 40 - 150 hours. The different stages in firing are;

Water smoking or dehydration stage - It is a process in which free water retained in the pores of the clay after drying gets evaporated under a high temperature of 400-650°C and the clay loses its plasticity. Some of the carbonate minerals are eliminated. Oxidation - This process occurs at a very high temperature of 650-900°C in which the ferrous iron is oxidized to the ferric form and the remaining carbon is eliminated. Vitrification- This process occurs at a very high temperature of 900- 1100°C for low melting clay and 1000-1250°C for high melting clay, where the clay is transformed into a soft molten mass as a result of an increase in temperature. It gradually loses the shape and transforms into a glassy structure after cooling. Flashing - In this process, the fire in the kiln is regulated in such a way that it causes a reduction in the kiln temperature and the cooling process begins which produces color variations in bricks.

6) Drawing - It is the process involving the unloading of the kiln after cooling and packing of the bricks for further shipment.

answered: Guest

lol idk man i guess u gotta ask bill nye the science guy

answered: Guest

metals are good conductor of electricity. it has free electrons on their surface. according to electron pool theory, each atom present in a metal crystal losses all of its valence electron and as a result a pool of free is form. these pool of electrons are free to move and conduct electricity easily while making metal as good conductor.

the correct answer is a. the ability of electrons to flow throughout the metal.

if it's not useful, feel free to report for mistake in answer.