- What metal is oxidized in a car battery? Enter the chemical symbol of the element.?

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Why do I like Math and find it so easy, and hate physics and find it super difficult? Is the condition that a subset of a vector space contains zero vector a necessary or a sufficient condition for the subset to be a subspace? Let c ∈ Z3750 such that 491000 ≡ c (mod 3750). Then c =? 2NO + O2-> 2NO2 ∆=-114. what is the enthalpy change when 3.7 moles of nitric oxide react? Mathematics, Higher revision.
Someone please help as I'm no good at stuff like this :(?