Classify each of the following processes as either a physical or chemical change.
A) Evaporation of alcohol
B) Rusting of iron
C) Formation of snowflakes
D) Making iron nails from an iron block
※若果那項是chemical change的話，請列明該過程中會有什麼新物質生成。※
一條簡單化學問題！
2008-08-25 4:42 am
回答 (3)
2008-08-25 4:53 am
✔ 最佳答案
A) Physical change
B) Chemical change: The new substance formed is rust.
C) Physical change
D) Physical change
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2008-08-25 5:02 pm
A) Evaporation of alcohol --- physical
B) Rusting of iron --- chemical
--- 4Fe(s) + 2nH2O(l) +3O2(g) ----> 2Fe2O3 .nH2O (s) rust
C) Formation of snowflakes --- physical
D) Making iron nails from an iron block --- physical
B) Rusting of iron --- chemical
--- 4Fe(s) + 2nH2O(l) +3O2(g) ----> 2Fe2O3 .nH2O (s) rust
C) Formation of snowflakes --- physical
D) Making iron nails from an iron block --- physical
2008-08-25 6:21 am
evaporation of alcohol is physical change
rusting of iron is chemical change because hydrated iron (III) oxide is formed
formation of snowflakes is physical change
making iron nails from an iron block is also physical change
physical change= no new substance formed
chemical change = one or more new substances formed
rusting of iron is chemical change because hydrated iron (III) oxide is formed
formation of snowflakes is physical change
making iron nails from an iron block is also physical change
physical change= no new substance formed
chemical change = one or more new substances formed
參考: myself
收錄日期: 2021-04-13 16:00:12
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