Determine the oxidation number for the indicated element in each of the following compounds: (a) co in licoo2, (b) al in naalh4, (c) c in ch3oh (methanol), (d) n in gan, (e) cl in hclo2, (f) cr in bacro4.

(a) Co = +3

(b) Al = +3

(c) C = -2

(d) N = -3

(e) Cl = -3

(f) Cr = +6

Explanation: Oxidation number: Oxidation number of an element in any particular chemical reaction is the defined as the electrical charge.

(a) The oxidation number of Co in LiCoO₂

Where the oxidation numbers of

Li = +1 , O = -2 and let the oxidation number of Co = x

Therefore,

x + (+1) +  (-2×2) = 0

x + 1 - 4 = 0

x - 3 = 0

x = +3.

Therefore the oxidation number of Co = +3

(b) Al in NaAlH₄

Where Oxidation of Na = +1, H = -1, and let the oxidation number of Al = y

+1 + (y) + (-1×4) = 0

y -4 +1 = 0

y - 3 = 0

y = +3.

Therefore the oxidation number of Al = +3

(c) C in CH₃OH

Where the oxidation number of

H = +1, O = -2, let the oxidation number of C = z

Therefore,

z + (+1×3) + (-2) + (+1) = 0

z + 3 - 2 + 1 = 0

z + 2 = 0

z = -2.

Therefore the oxidation number of C = -2.

(d)  N in GaN

Where Ga = +3 and let the oxidation number of N = a.

Therefore,

a + (+3) = 0

a + 3 = 0

a = -3.

Therefore the oxidation number of N = -3

(e) Cl in HClO₂

Where H = +1, O = -2 and let The oxidation number of Cl = b

+1 + b + (-2×2) = 0

1+b-4 = 0

b + 3 = 0

b = -3

Therefore the oxidation number of Cl = -3

(f) Cr in BaCrO₄

Where Ba = +2, O = -2 and let the oxidation number of Cr = c

+2 + c + (-2×4) = 0

+2+c-8 = 0

c - 6 = 0

c = 6

Therefore the oxidation number of Cr = +6

mechanics (greek   is that area of science concerned with the behaviour of physical bodies when subjected to forces or displacements, and the subsequent effects of the bodies on their environment. the scientific discipline has its origins in ancient greece with the writings of aristotle and archimedes[1][2][3] (see history of classical mechanics and timeline of classical mechanics). during the early modern period, scientists such as galileo, kepler, and newton laid the foundation for what is now known as classical mechanics. it is a branch of classical physics that deals with particles that are either at rest or are moving with velocities significantly less than the speed of light. it can also be defined as a branch of science which deals with the motion of and forces on objects. the field is yet less widely understood in terms of quantum theory.

explanation: