Question

Predict the sign for ∆S of these reactions/processes

(1) positive, 2) negative, or (3) it is not possible to predict/not enough information

● melting double stranded DNA

● freezing water

● dissolving NaCl in water

● changing the temperature of liquid water from 45 ºC to 25 ºC ● N2 (g)+ 3 H2 (g) → NH3 (g)

● CaCO3 (s) → CO2 (g) +CaO (s)

● mixing hot and cold water

● unfolding a protein

● forming a DNA double helix from its individual strands

● mixing ice at -10°C with liquid water at 20­°C

● sublimating solid CO2

● decreasing the temperature of a protein solution

● 3O2 (g) → 2O3 (g)

● dissolving glucose in water

● Binding a drug to an enzyme

Answer 1

sign for ∆S of these reactions/processes.

● melting double stranded DNA = Positive

● freezing water = negative

● dissolving NaCl in water = positive

● changing the temperature of liquid water from 45 ºC to 25 ºC = it is not possible to predict.

● N2 (g)+ 3 H2 (g) → 2NH3 (g) = negative

● CaCO3 (s) → CO2 (g) +CaO (s) = positive

● mixing hot and cold water = negative

● unfolding a protein = positive

● forming a DNA double helix from its individual strands = negative

● mixing ice at -10°C with liquid water at 20­°C = it is not possible to predict

● sublimating solid CO2 = positive

● decreasing the temperature of a protein solution = it is not possible to predict

● 3O2 (g) → 2O3 (g) = negative

● dissolving glucose in water = positive

● Binding a drug to an enzyme = negative