Answer:
K= -0.286 Mol^-1.S^-1
Explanation:
FIRSTLY, WE WRITE A CHEMICAL REACTION EQUATION FOR THE REACTION BETWEEN OXALIC ACID AND POTASSIUM PERMANGANATE.
KMnO2(aq) + H2C2O4(aq) ----> Mn2+(aq) + CO2(g) + H2O(l)
(purple) (colorless)
THE RATE OF THE REACTION IS MEASURED AND MONITORED BY CHECKING FOR THE DISAPPEARANCE OF THE PURPLE COLOR OF THE POTASSIUM PERMANGANATE.
The rate of the reaction is given by : -Δ[KMnO4]/ΔT = -Δ[ H2C2O4]/ΔT = Δ[ Mn2+]/ΔT
When all of the purple color is gone, we can say that the reaction is finished and that the final concentration of the KMnO4 is now zero. Since the initial time for ΔT is zero, the equation for the rate of
disappearance of the potassium permanganate becomes:
Rate = Δ[KMnO4]/ΔT= (0-[initial KMnO4]) ÷ (elapsed time -0) = [Initial KMnO4 ] ÷ elapsed time
Hence, the rate of the chemical reaction is thus;
-1.3/5 = -0.26M/s
Now, to get the rate constant for the reaction, we need to know the rate law and this can be expressed as follows:
For a reaction A+B---> C The general rate law would be: Rate = k[A]^m[B]^n
In this particular case,
Rate =k [KMnO4][ H2C2O4]
Kindly note that m and n in this case is 1 each. We have calculated our rate from above. Hence:
-0.26 = k(1.3)(0.7)
k = -0.26÷(1.3)(0.7)
K= -0.286 Mol^-1.S^-1
3. A full octet (8 electrons) is needed to be stable. So if the atom gets 3 more atoms it will be stable.
Answer:
1. Mg (s) + 2Na+(aq) → 2Na(s) + Mg²⁺(aq)
2. 2K(s) + Cd²⁺(aq) → 2K⁺(aq) + Cd(s)
Explanation:
The net ionic equation of a reaction express only the chemical species that are involved in the reaction:
1. Mg (s) + Na2CrO4 (aq) → 2Na + MgCrO4(aq)
The ionic equation:
Mg (s) + 2Na+(aq) + CrO4²⁻ (aq) → 2Na + Mg²⁺ + CrO4²⁻(aq)
Subtracting the ions that don't change:
<h3>Mg (s) + 2Na+(aq) → 2Na + Mg²⁺</h3>
2. 2K(s) + Cd(NO3)2(aq) → 2KNO3(aq) + Cd(s)
The ionic equation:
2K(s) + Cd²⁺(aq) + 2NO3⁻(aq) → 2K⁺(aq) + 2NO3⁻(aq) + Cd(s)
Subtracting the ions that don't change:
<h3>2K(s) + Cd²⁺(aq) → 2K⁺(aq) + Cd(s)</h3>
Answer:
Boiling Point!
Explanation:
Hope this helps. Good luck!
Answer:
It get thicker beacause the mid ocean
Explanation:
Because when it gets moved back the heat rises and it builds up to be thicker.