Answer:
1) Squat down low and cover your head. (if no shelters are present)
2) 1 gallon per person per day
Notice that the metals trade places. That means it is a double replacement RXN or C
Answer:
1. Hyphothesis 2.Theory 3. law
Explanation:
not sure, but law is observation, theory is based on knowledge things before.
To calculate the amount of heat evolved when 2 moles of methane that is burned, we use the value of the heat of combustion and multiply it by the number of moles. We calculate as follows:
Heat = 2 mol ( - 890 kJ/mol) = -1780 kJ -------> OPTION A
Solution :
The buffer is the one that contains weak acid (the 
is nearly equal to the required pH) and the salt of its conjugate base.
The values of the given weak acids are as follows :
HCOOH : = 3.744
HCN : = 9.21
Since the required pH is 5.03, the suitable buffer is the mixture of the acetic acid and the salt of its conjugate base.
Let suppose the volumes of 
and 
are x and y mL respectively.
So the total volume of the buffer is 1000 mL.
∴ x+ y = 1000 ................(1)
Writing the Henderson-Hasselbalch equation for the given buffer solution :
![$pH = pK_a + \log \ \frac{[CH_3COONa]}{[CH_3COOH]}$](https://tex.z-dn.net/?f=%24pH%20%3D%20pK_a%20%2B%20%5Clog%20%5C%20%5Cfrac%7B%5BCH_3COONa%5D%7D%7B%5BCH_3COOH%5D%7D%24)
.............(2)
y = 1.9 x
Substituting the values of y in equation (1), we get
x + 1.9 x = 1000
x = 345
Putting the value of x in (1), we get
345 + y = 1000
y = 655
Therefore the volume of is 345 mL and the volume of is 655 mL.
