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chemistry
january 2020
27

Chemistry Questions and Answers January 27, 2020

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List some of the common sources of sulfate ions in natural and industrial environments. For a given sulfate concentration, explain which of the following solutions would be the most deleterious and which would be the least deleterious to a permeable concrete containing a high-C3A portland cement: Na2SO4, MgSO4, CaSO4.

What chemical reactions are generally involved in sulfate attack on concrete? What are the physical manifestations of these reactions?

What is the alkali-aggregate reaction? List some of the rock types that are vulnerable to attack by alkaline solutions. Discuss the effect of aggregate size on the phenomenon.

Helium is used in a pressure thermometer. The volume of the thermometer bulb is 0.05L. The thermometer is filled with gas to 110 kPa (abs) at 20C. Caluculate the pressure of the gas if the temperature is raised to 120C. State your assumptions clearly.

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