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![QUESTION 23 When copper (l) sulfate pentahydrate is heated, it produces a clear, colorless liquid Which ofthe following statements is false 1 points Save A □ The liquid obtained from the decomposition of copper (II) sulfate pentahydrate is water □ Copper (li) sulfate can decompose into copper (1) oxide and sulfur trioxide. □ Copper (1) sulfate pentahydrate decomposes into carbon dioxide and water. QUESTION 24 1 points Save Asw The color change from blue to white as copper (l) sulftate pentahydrate is heated indicates [] The occurrence of a chemical change. That a mestake was made during the heating. The occurrence of a physical change QUESTION 25 1 points Save When a liquid substance contains a dissolved impunty, the substance Will be unable to undergo supercooling Freezes at a lower temperature than the pure substance will be unable to freeze at any temperature Freezes at a higher temperature than the pure substance QUESTION 26 When a liquid substance is stired as it is cooled t □ will be unable to freeze at any temperature □ Freezes at a higher temperature than when it not stirred Will be unable to undergo suparcooing](https://d2vlcm61l7u1fs.cloudfront.net/media%2F23b%2F23b60b41-e2bd-4de0-9074-10a4e92991ac%2Fimage)
When copper (l) sulfate pentahydrate is heated, it produces a clear, colorless liquid Which of the following statements is false. The liquid obtained from the decomposition of copper (II) sulfate pentahydrate is water. Copper (II) sulfate can decompose into copper (II) oxide and sulfur trioxide. Copper (II) sulfate pentahydrate decomposes into carbon dioxide and water. The color change from blue to white as copper (l) sulfate pentahydrate is heated indicates The occurrence of a chemical change. That a mistake was made during the heating. The occurrence of a physical change. When a liquid substance contains a dissolved impurity, the substance Will be unable to undergo supercooling. Freezes at a lower temperature than the pure substance. will be unable to freeze at any temperature. Freezes at a higher temperature than the pure substance. When a liquid substance is stirred as it is cooled Will be unable to freeze at any temperature. Freezes at a higher temperature than when it not stirred. Will be unable to undergo supercooling. Freezes at a lower temperature than when it is stirred.
Expert Answer
23. Ans C
CuSO4 can decompose as SO3 and CuO but CO2 can never be involved. The pentahydrate form of CuSO4 can release water which can be seen as liquid. So third one is the only wrong.
24.Ans C.
When heated, the pentahydrate form releases water and shows white color. Here no breaking of bond is involved, no new product is formed, only water gets displaced so it is a physical change.
25 Ans B.
Presence of impurities lowers the freezing point of a liquid. Example, Sea water has salts in it and freezes at about -2°C in stead of 0.
26. Ans D.
While stirring, there is mechanical work is involved and some extra energy will be with the liquid so to freeze it we will need lower temperature.
