Answer:
This means that Antarctica once had a warmer climate.
Explanation:
Trees usually grow in warm climates, and Antarctica has little to no plant life.
Coefficients, you can’t change the subscripts but you can balance the equation by adding coefficients to both sides
How does the law of conservation of mass apply to this reaction: C2H4 + O2 → H2O + CO2?
Answer:-
Oxygen gains electrons and is reduced.
Explanation:-
For this reaction the balanced chemical equation is
4Fe + 3O2 --> 2Fe2O3
When Oxygen is present as oxygen gas, the oxidation number of O is Zero since it is the only element present in Oxygen gas.
Similarly Iron is present in Fe with oxidation number Zero.
In the case of Fe2O3, Oxygen has the oxidation number -2 while Iron has +3.
So the oxidation number of Oxygen goes from Zero to -2.
Since the oxidation number decreases Oxygen is reduced.
Since reduction involves gain of electrons, Oxygen gains electrons.
