Answer:
Case I - Number of leaves
Case II - Acid level of lake
Explanation:
A controlled variable is the one which is kept constant or unchanged throughout an experiment.
In the question –
For case I –
Here the impact of number of leaves on a given tree is studied on the number of nest build by birds.
Thus, the number of leaves is a constant variable that shall remain constant throughout and hence it is a controlled variable.
For case II –
Just like in the above case, in this case too the acid level of the lake shall remain constant as the effect of acid level of lake is studied on the survival instinct of fishes in the lake.
1 mile = 5280 feet
So, 65 mph = 343,200 fph or 5,720 fpm or 125,840 feet in 22 minutes,
hope this helps :))
Answer:
Covalent so it is C.
Explanation:
That is water bro.
H2O and water is covalent since they are shared and they are touching in the picture.
Electrons are being shared not transferred and covalent means they are being shared.
Hope this helps!
The freezing point depression is calculated through the equation,
ΔT = (kf) x m
where ΔT is the difference in temperature, kf is the freezing point depression constant (1.86°C/m), and m is the molality. Substituting the known values,
5.88 = (1.86)(m)
m is equal to 3.16m
Recall that molality is calculated through the equation,
molality = number of mols / kg of solvent
number of mols = (3.16)(1.25) = 3.95 moles
Then, we multiply the calculated amount in moles with the molar mass of ethylene glycol and the answer would be 244.9 g.