Archives for February 2008

All the posts are meant for all global readers and students. It is not just for our local Sec 3, 4 and 5 students.

Do feel free to let us know your thoughts on it,

6. How does the mass of Copper (II) oxide change when it is heated in Hydrogen and in Oxygen

Mass after heating in Hydrogen , ?Mass after heating in Oxygen
A) decrease ,?decrease
B) decrease , unchanged
C) unchanged , ?decrease
D) unchanged , ?unchanged

Ans: B

What are your thoughts?