Which of the following chemical reactions is an oxidation-reduction reaction?
CuSO4 + BaCl2 yields BaSO4 + CuCl2
Pb(NO3)2 + 2NaCl yields PbCl2 + 2NaNO3
N2 + 3H2 yields 2NH3
K2SO4 + BaCl2 yields BaSO4 + 2KCl
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Put on the ox number by the following rules: http://www.dummies.com/how-to/content/rules-for-assigning-oxidation-numbers-to-elements.html
Element which get change in ox.n. are or ox or red. Whan you had a raction containing ox and red atoms, its a red-ox
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What is true of an element that was oxidized in a chemical reaction?
It lost electrons.
It gained electrons.
It increased electronegativity.
It decreased electronegativity.
would b be correct @taramgrant0543664 ?
Lose electrons oxidized, gain electrons reduced
so a would be correct @taramgrant0543664
Yes a would be correct
What is the oxidation number of oxygen (O) in O2?
would b be correct @taramgrant0543664
Rule 1: The oxidation number of an element in its free (uncombined) state is zero — for example, Al(s) or Zn(s). This is also true for elements found in nature as diatomic (two-atom) elements
so @Bozhena b would be wrong
yes, b is wrong
It's electrically neutral just like we did with F2
so a would be right?
It would be a since it would become neutral
Which of the following describes an element that is reduced in a reaction?
It acts in the reactant that is the reducing agent.
It has a decrease in its oxidation number.
Cd yields Cd2+ + 2e−
Zn + Cu2+ yields Zn2+ + Cu
for c and d are both incorrect ithink
Gaining electrons is reduced and therefore the oxidation number would become more negative so there would be a decrease in oxidation number