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Water Activity Thermodynamics Quiz

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Questions and Answers

What does the symbol $μ$ represent in the equation $μ = μ_o + RT ext{ln}(f/f_o)$?

Pressure

Temperature

Chemical potential (correct)

Molar mass

What is the equation for the activity of water in a system?

$a_w = f/f_o$ (correct)

$a_w = f - f_o$

$a_w = f_o/f$

$a_w = f_o - f$

What does the symbol $a$ represent in the context of thermodynamic activity?

Molar mass

Activity coefficient (correct)

Vapor pressure

Fugacity

What is the practical approximation for the activity of water in most food conditions?

$a_w = P/P_0$ (B) Signup and view all the answers

What does the symbol $R$ represent in the equation $μ = μ_o + RT ext{ln}(f/f_o)$?

Universal gas constant (B) Signup and view all the answers

At what water activity value do most bacteria cease to grow?

Below 0.91 (B) Signup and view all the answers

What did W J Scott establish in 1953 regarding bacterial growth?

Water activity, not water content, correlated with bacterial growth (D) Signup and view all the answers

What did researchers find about the correlation between bacterial growth potential and moisture content?

Values were specific to each food product (A) Signup and view all the answers

What is the primary factor in controlling spoilage in food products?

Water activity (C) Signup and view all the answers

At what water activity value do most molds cease to grow?

Below 0.80 (C) Signup and view all the answers