Answer : The correct option is, 
Explanation : Given,
pH = 10
First we have to calculate the pOH.
Now we have to calculate the 
concentration.
![pOH=-\log [OH^-]](https://tex.z-dn.net/?f=pOH%3D-%5Clog%20%5BOH%5E-%5D)
![4=-\log [OH^-]](https://tex.z-dn.net/?f=4%3D-%5Clog%20%5BOH%5E-%5D)
![[OH^-]=1.0\times 10^{-4}M](https://tex.z-dn.net/?f=%5BOH%5E-%5D%3D1.0%5Ctimes%2010%5E%7B-4%7DM)
Therefore, the concentration is, 
D) physical and chemical changes
Answer:
Answer: Chemical change; Chemical property of heat of combustion
Explanation:
A physical change is defined as a change in which there is alteration in shape, size etc. No new substance gets formed in these reactions.
Explanation:
Answer:
C4H8
Explanation:
First find the molar mass of CH2;
2(1.01) + 1(12.01) = 14.03g
Now divide the molar mass of the compound by the molar mass of CH2;
56g/14.03g = 3.9914 Round to nearest whole number = 4
Multiply CH2 by 4 to get the molecular formula;
CH2* 4 = C4H8
