Identify the elements that are oxidized and reduced in the following reaction. K
ID: 531357 • Letter: I
Question
Identify the elements that are oxidized and reduced in the following reaction. KClO_3(aq) + 6HBr(aq) KCl(aq) + 3Br_2(I) - 3H_2O(I) A) CI is oxidized and Br is reduced B) Br is oxidized and Cl is reduced C) Cl is oxidized and H is reduced D) H is oxidized and O is reduced E) O is oxidized and CI is reduced How many protons and electrons are present in one Br^- ion? A) 35 p, 36 e B) 35 p, 35 e C) 80 p. 34 e D) 35 p. 34 e E) 80p, 81e Which of the following is an example of an empirical formula? A C_9H_18Cl_2 B) V_2O_4 C) C_9H_12 D) C_2H_2O_2 E) C_6H_6 A piece of copper with a mass of 218 g heat capacity of 83.9 J/degree C. What specific heat of copper? A0 1.83 times 10^4 J/g. degree C B) 2.60J/g. degree C) 0.385 J/g. degree C D) 1.32 J/g. degree C E) 24.5 J/g. degree C In the following chemical reaction the oxidizing agent is 5H_2O_2 + 2MnO_4^- + 6H^+ rightarrow 2Mn^2+ + 8H_2O + 5O_2 A) H^+ B) O_2 C) MnO_4^- D) H_2O_2 E) Mn^2+Explanation / Answer
24) Answer (b).
In KClO3 ,Cl exist in +5 state changes to (-1) in KCl.So Cl is reduced.
In HBr , Br exist in -1 state changes to 0 in Br2.So Be is oxidised.
25) Answer (a)
Br - atomic number = 35
This means 35 protons.
Br accept an electronic it becomes Br^-.
# electrons = 36.
26) Answer (d).C2H2O2
Empirical formula is the simplest positive integer ratio of atoms present in a compound.
27) Answer (c) 0.385 J/goC
The heat capacity C of an object, composed of a mass m of a material of specific heat capacity c, then the two quantities are related by
C = m.c
c = C/M = 83.9/218 = 0.385 J/goC
28) Answer (c) MnO4^-
MnO4^- oxidize H2O2 to O2 { here oxidation state of O changes from (-1) to 0.