Es 2.
The following table relates the time and the mass of Zn during the reaction between Zn and 0.5M HNO3 :
Zn
2HNO3
H2 Zn(NO3)2
+
+
Time
0.0 s
60.0 s
120.0 s
180.0 5
Mass of Zn (g)
36.2 g
29.6 g
25.0 g
22.08
a) Calculate the reaction rate, in g/s, from time 0 to 60 s.
b) Calculate the reaction rate, in g/s, from time 120s to 180 s.
c) Explain why the rate in calculation "b" is less than that of calculation "a".

answer : a model is often used to explain and make things easier to understand when any scientific topic needs to be demonstrated and explained.

as in this case where a scientist wants to use a model to present the results of his detailed scientific investigation. he should do it as it will him to make the audience understand the concept in a much better way. also, it can be changed according to new scientific understandings.

the dissociation of nickel hydroxide is follows:

the concentration of hydroxide ion is

the equilibrium constant value of nickel hydroxide is = 6.1 * 10^-^1^6 and thus equilibrium equation can be written as:

thus, concentration of ni is 0.23 * 10^-^4 mol /l

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