Hydrozine (N2H4) emits a large quantity of energy when it reacts with oxygen, which has
led to its use as a fuel for rockets:
N2H4(l) + O2(g) → N2(g) + 2 H2O(g).
How many grams of water are produced
when 16 g of pure hydrazine is ignited in the
presence of 34 g of pure oxygen?
Answer in units of g.

answer: c. the experiment shows that the red substance experienced a chemical change.

explanation: chemical change is the change in which chemical composition of the substance changes. physical change is the change in which there is no change in chemical composition.

chemical changes are accompanied by following changes:

a) precipitate formation

b) energy is released or absorbed

c) formation of bubbles

d) change in color

as it is given that the red color has disappeared and there is production of gas, it means the red substance has undergone a chemical change.

e

i wish i could but this one is weird give me abc and i can solve it.