Answer:
9
Explanation:
let f(x)= x-7 be equation i
let g(x)= x^2 be equation ii
Substitute x-7 as x in equation 2
implies gf(x) = (x-7)^2=(x-7)(x-7)
substitute x=4 implies
gf(x) = (4-7)(4-7)=(-3)(-3)=9
Answer:
The volume is 50, 74 l
Explanation:
We use the formula PV = nRT. The temperature in Kelvin is = 273+ 20 =293K
PV=nRT ---> V = (nRT) / P
V= (2.0 mol x 0,082 l atm /K mol x 293 K) / 0,947 atm
V=50,74128828 l
Answer:
Chromium is reduced in forward reaction
Explanation:
A species is said to be oxidized if oxidation number of the species increases.
A species is said to be reduced if oxidation number of the species decreases.
Oxidation number of Cr in 
= +6
Oxidation number of Cr in 
= +3
So change in oxidation number of Cr in forward reaction = (+3)-(+6) = -3
Hence oxidation number of Cr decreases on going from to .
So, chromium is reduced in forward reaction.
Answer:
B) H2O
Explanation:
Compound is a pure substance composed of two or more different atoms chemically bonded to one another. Among all choices only H₂O is composed of two atoms, and other choices are composed of only one atom. H₂O is the pure substance composed of chemically bonded two atoms (hydrogen atoms and oxygen atom).
