When you put water in a freezer, solid ice is formed. How is this change differe
ID: 565620 • Letter: W
Question
When you put water in a freezer, solid ice is formed. How is this change different from the precipitation reactions in this experiment that also form solids? How should each of these changes be classified? When you put water in a freezer, solid ice is formed. How is this change different from the precipitation reactions in this experiment that also form solids? How should each of these changes be classified?Chemical or physical: The temperature at which iodine sublimes The smell of roses Burning a candle Silver tarnishing Properties and Changes in Matter Postlab Questions 1. When you put water in a freezer, solid ice is formed. How is this change different from the precipitation reactions in this experiment that also form solids? How should each of these changes be classified? 2. Classify each property as chemical or physical: a. The boiling point of methyl alcohol pnysiee b. The temperature at which iodine sublimes c. The flammability of gasoline Chemice d. The smell of roses
Explanation / Answer
1. When water freezes o solid ice, it is only aphysical change, i.e. from liquid state to solid state. In this case there is no chemical change; whereas when a precipitate is formed, it is due to a chemical change, where one molecule is converted to another.
2. b) Sublimation of iodine is is a physical change from solid to gas and the temperature is called as sublimation temperature.
d) Smell of roses is due to physical change which involves evoperation of scent molecules.
e) Burning of candle is a chemical process
f) Tarnishing of silver is a chemical process, where Ag gets converted to Ag2O.
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