Question

Complete the missing components/variables given as x and y in

the following reactions

(a) Pb(NO3

)

2

(aq) + 2KI(aq) → PbI2

(x) + 2KNO3

(y)

(b) Cu(s) + 2Ag NO3

(aq) → Cu(NO3

)

2

(aq) + x(s)

(c) Zn(s) + H2

SO4

(aq) → ZnSO4

(x) + H2

(y)

(d) CaCO3

(s) →x CaO(s) + CO2​

Answer 1

Answer:

The solid-vapor curve, labeled AB in Figure 2, indicates the temperatures and pressures at which ice and water vapor are in equilibrium. These temperature-pressure data pairs correspond to the sublimation, or deposition, points for water. If we could zoom in on the solid-gas line in Figure 2, we would see that ice has a vapor pressure of about 0.20 kPa at −10 °C. Thus, if we place a frozen sample in a vacuum with a pressure less than 0.20 kPa, ice will sublime. This is the basis for the “freeze-drying” process often used to preserve foods, such as the ice cream shown in Figure 3.