During a very cold winter, the temperature may remain below freezing for extende

Question

During a very cold winter, the temperature may remain below freezing for extended periods. However, fallen snow can still disappear, even though it cannot melt. This is possible because a solid can vaporize directly, without passing through the liquid state. Is this process (sublimation) a physical or a chemical change? Discuss the similarities and differences between a liquid and a gas. True or false? Salad dressing (such as oil and vinegar dressing) separating into layers after standing is an example of a chemical change because the end result looks different from how it started. Explain your answer. The fact that solutions of potassium chromate are bright yellow is an example of a ___ property. Which of the following are true? a. P_4 is considered a compound. b. Metal rusting on a car is a chemical change. c. Dissolving sugar in water is a chemical change. d. Sodium chloride (NaCl) is a homogeneous mixture. Solutions containing nickel(II) ion are usually bright green in color. When potassium hydroxide is added to such a nickel(II) solution, a pale-green fluffy solid forms and settles out of the solution. The fact that a reaction takes place when potassium hydroxide is added to a solution of nickel(II) ions is an example of a ___ property. The fact that a solution of nickel(II) ion is bright green is an example of a ___ property. The processes of melting and evaporation involve changes in the ___ of a substance. A/n ___ always has the same composition.

Explanation / Answer

40) Sublimation is a process where a solid changes directly to vapour phase without passing through liquid phase. In this phase change only the state matter changes from solid to vapour and no chanage in its chamical structure or chemical formula occur. Snow in both solid and vapour phase have the same chemical formula i.e. H2O, thus it is a physical change.

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