Atomic number is less than 11
Answer:
O and H
Explanation:
I don't know the explanation
Iron is a chemical element with symbol Fe (from Latin: ferrum) and atomic number 26. It is a metal in the first transition series. It is by mass the most common element on Earth, forming much of Earth's outer and inner core.
So your answer is Iron
Answer:
The candle will give out less light if there is a lower of oxygen. This happens because a high concentration of oxygen means that there are a of oxygen molecules near the wax. With a lot of molecules - it is likely that the molecules will bump into the wax.
:)
Answer:
is the value of 
for the acid HA.
Explanation:
The pH of the solution = 3.75
The hydrogen ion concentration :
![pH=-log[H^+]](https://tex.z-dn.net/?f=pH%3D-log%5BH%5E%2B%5D)
![3.75=-\log[H^+]](https://tex.z-dn.net/?f=3.75%3D-%5Clog%5BH%5E%2B%5D)
![[H^+]=10^{-3.75}=0.0001778 M](https://tex.z-dn.net/?f=%5BH%5E%2B%5D%3D10%5E%7B-3.75%7D%3D0.0001778%20M)
Concentration of weak acid = 0.100 mole/L
Initually
0.100 M 0 0
At equilibrium
(0.100-x)M x x
The expression of dissociation constant can be given as:
Here the value of x = ![[H^+]=0.0001778 M](https://tex.z-dn.net/?f=%5BH%5E%2B%5D%3D0.0001778%20M)
is the value of for the acid HA.
