A change of state, also known as a change of phase, is when a substance changes from one state of matter to another, such as changing from a liquid to a gas. A phase change is always associated with a change of heat, where the heat is either going into the substance or leaving the substance. Types of phase changes are melting, freezing, vaporization, condensation, and sublimation.
A phase change the way it is described sounds like a physical change only it can however be a chemical change in general, but with some exemptions. In the case of water turning into ice is not a chemical change, no chemical reaction is involved, nor its chemical composition altered only the arrangement of molecules changed.
In a phase change process there are many controlling factors so the dependence on concentration is not important but the dependence on othere factors are such that they cannot be cataegorised as as per the standard rules of pure chemical kinetics.
For example rate of evaporation of water can be calculated as follows
Rate of evaporation is proportional to the difference between the saturation vapour pressure (SVP) at the water temperature and the actual vapour pressure in the air ()
As you can see in the equation there is no concentration term just so you cannot say this is a zero order reaction. But the equation does have a zero order format.
Hope this answers your question
A change of state, also known as a change of phase, is when a substance changes...
Phase changes are transitions between solid, liquid, and gas phases. For example, ice melting is an example of a phase change from a solid (ice) to a liquid (water). Phase changes involve changes in energy. Which of the statements regarding phase changes are true? Sublimation is the conversion of a gas to a solid. Freezing is the conversion of a gas to a liquid. Deposition is the conversion of a gas to a solid. Melting is the conversion of a...
Matter can be transformed from one physical state to another by adding or removing heat. Gas Liquid Solid Select all the processes displayed in the image above that are endothermic. Choose one or more: Vaporization Sublimation Condensation Deposition Freezing Melting
O Assignment Score: 40.9% Resources Hint Check Answer Question 22 of 22 > Phase changes are transitions between solid, liquid, and gas phases. For example, ice melting is an example of a phase change from a solid (ice) to a liquid (water). Phase changes involve changes in energy. Which of the statements regarding phase changes are true? Deposition is the conversion of a gas to a solid. Melting is the conversion of a solid to a liquid. Sublimation is the...
4. Phase changes always have the same signs for AH and AS'. What are the signs for AH and AS for these phase changes? a. vaporization b. freezing c. condensation d. fusion (melting) e. sublimation f. deposition
Label the phase changes shown in the diagram below. Freezing Condensation Sublimation Vaporization Deposition Melting
46.2% Resources Give Up? Hint Consider the phase diagram for carbon dioxide. 73.0 In what phase is CO, at 4 atm and -10 °C? solid liquid O gas Pressure (atm) solid liquid 5.11 1.0 31.1 -78.5-564 Temperature (°C) Starting from the same point, 4 atm and -10 °C, what phase change would eventually result from an increase in pressure? freezing deposition melting condensation sublimation vaporization
QUESTION 10 Which three changes of state release energy to the surroundings? Melting, Vaporization, Sublimation Freezing, Vaporization, Deposition Melting, Condensation, Sublimation Freezing, Condensation, Deposition QUESTION 8 Which of the following is a heterogeneous mixture? O Whipped cream O shampoo O trail mix o fog QUESTION 15 What type of macromolecule in food (carbohydrate, fat, protein) contains the MOST energy per gram? Protein Fat Carbohydrate
9. The phase diagram for Xenon is provided opposite Liquid What phase change(s) occur as Xenon is cooled from room temperature to -150°C at 2 atm pressure 100 Solid 10 Deposition only Condensation then Freezing а) b) Gas c) Melting then Vaporisation 0.1 d) Condensation then Sublimation 0.01 Sublimation only е) -180 -120 -60 0 60 Temperature (C) 10. A schematic phase diagram is shown below. The temperature and pressure defining the (solid,liquid,gas) triple point (Tip,Pp) and the critical point...
B. Calculation of Heat during phase change. A phase change is a physical process in which a substance goes from one phase to another. The temperature of a substance does not change as the substance goes from one phase to another. The heat of fusion (AHfus) is the amount of heat per gram (or per mole) required for a phase change that occurs at the melting point. The heat of vaporization, (Hvap) is the amount of heat per gram (or...
Substance X is known to exist at 1atm in the solid, liquid, or vapor phase, depending on the temperature. Additionally, the values of these other properties of Xhave been determined.: melting point 15.°C enthalpy of fusion 8.00/kJmol density 2.00/gcm3 (solid) 1.60/gmL (liquid) boiling point 60.°C enthalpy of vaporization 31.00/kJmol heat capacity 36.·J·K−1mol−1 (solid) 29.·J·K−1mol−1 (liquid) 55.·J·K−1mol−1 (vapor) You may also assume X behaves as an ideal gas in the vapor phase. Suppose a small sample of X at −20°C is...