The oxide must have a greater mass than the element as O atoms have been added. Thus CuO must have a great mass than Cu.
For 1. I suspect that they are thinking of room temperature and pressure. Thus CO2 is a gas, H2O is a liquid.
When an element is burnt in excess oxygen, is the oxide formed always:
1. a crystalline solid
2. greater in mass than the element
3. soluble in water
4. white in color
alright, i know that most oxides are not soluble in water other than group 1 elements and calcium and barium. (correct me if i'm wrong) And not all oxides are white in color. So, what about option 1 and 2? The correct answer is 2, but i don't get it, why must the oxide formed be heavier than the element?? And what kind of oxide isn't a crystalline solid?
Help, thanks!
3 answers
ans 3
It should be answer 3 as suppose we take magnesium and oxygen
The mass of magnesium would obviously be less than when magnesium reacts with oxygen to form magnesium oxide.
Hope this helps
The mass of magnesium would obviously be less than when magnesium reacts with oxygen to form magnesium oxide.
Hope this helps
4 answers