Isn't a chemical change like something that's not a physical change or physically changed but is something that uses natural chemicals? that's my guess sorry if it's wrong I think I'm wrong though
Answer: (a) K *[A][B]^2
(b) The answer is B
Explanation:
A)
Step1:A+B<--> C (fast)
Step2: B+C→D(slow)
Rate depends on slowest step.
so,
rate = k' [B][C] ...eqn 1
But C is intermediate.so use step 1
Since 1st step is an equilibrium,
Kc = [C] /[A][B]
so,
[C] = Kc [A][B] ...eqn 2
put eqn 2 in eqn 1
rate = k' *[B] * Kc [A][B]
= k'Kc*[A][B]^2
= K *[A][B]^2 {writing k'Kc = K}
Answer: K *[A][B]^2
B)
Answer is B
Since rate depends on slowest step.
if slowest step is:
X2Y2+Z2→X2Y2Z+Z
then only,
rate= k[X2Y2][Z2]
Answer: B
The conversion factor for moles to atoms is 1 mole = 6.022X10^23 atoms. However, water is a molecule, and as you can tell from the chemical formula, H2O (2 hydrogen and 1 oxygen) we can tell that there are 3 atoms. So, in order to accurately get the number of atoms you need to multiply 6.022X10^23 by 3 to get how many atoms are in 1 mole of water. You then must take your answer of 1.8066X10^24 and multiply it by 5. The answer should be 9.033X10^24 atoms are in 5 moles of water. Hope this helps!