What are Reducing Agents? And why are they used in chemical reactions?

Answer 1

see below

Chemical reducing agents are substances, neutral molecules or ions, that can easily oxidate themselves to a bigger oxidation number, reducing another substance.
they generally have a low Oxidation number (as #S^2-, I^-# or #H_2S# that give S), but #Cl^-# is a weak reducing, and #F^-# isn't at all.

Other usefull reducing agents are: some metals as Mg, Al, Zn and #H_2, NO_2^-, SO_2, SO_3^(2-), Sn^2+, Fe^2+#, ethanol .
Their force is tabelled in the standard reduction potentials (see figure) where they are in the right on the bottom

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Answer 2

Luna Chen

Reducing agents are substances that donate electrons, leading to the reduction of another substance. They are used in chemical reactions to facilitate reduction reactions by providing electrons to reactants, promoting the conversion of another substance to a lower oxidation state.

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.