<h3>
Answer:</h3>
4.945 atm
<h3>
Explanation:</h3>
- Based on Dalton's law of Partial pressure, the total pressure of a mixture of gases is equivalent to the sum of individual partial pressures of the gases in the mixture.
In this case;
Partial pressure of Oxygen, P(O) = 0.255 atm
Partial pressure of N, P(N) = 3.24 atm
Partial pressure of Ar, P(Ar) = 1.45 atm
Therefore;
P(total) = P(O) + P(N) + P(Ar)
= 0.255 atm + 3.24 atm + 1.45 atm
= 4.945 atm
Therefore, the total pressure of the mixture is 4.945 atm
Answer:
a. Interference patterns are observed when a wave passes through a barrier with two slits
Explanation:
Interference is a situation where two waves superimpose to form a new wave of a different amplitude. This amplitude can be greater, same or lower.
the diagram attached below shows the movement of a wave through a barrier with two slits.
you can notice the portions of the wave that overlap. This overlapping of waves is the interference.
Thus, option A is correct.
The other options however, are not correct. as shown below:
Option B is wrong as waves exhibit diffraction <em>(it is diffraction of the light wave that produces the rainbows we see in the sky)</em>
Option C is wrong as waves do not travel straight through slits always.
Option D is wrong as waves can also interfere constructively and destructively.
We will use the expression for freezing point depression ∆Tf
∆Tf = i Kf m
Since we know that the freezing point of water is 0 degree Celsius, temperature change ∆Tf is
∆Tf = 0C - (-3°C) = 3°C
and the van't Hoff Factor i is approximately equal to 2 since one molecule of KCl in aqueous solution will produce one K+ ion and one Cl- ion:
KCl → K+ + Cl-
Therefore, the molality m of the solution can be calculated as
3 = 2 * 1.86 * m
m = 3 / (2 * 1.86)
m = 0.80 molal
I personally think b is the correct answer.
A-children don't think about what adults should do
B-limits give children skills to solve problems in life as they grow
C-its good to let a child know whats right and wrong
D-Limits wouldn't give kids insecurity
Please tell me if i'm right or wrong!:)
Salt is produced by the reaction of an acid with a base, alkali or carbonate. Hence, salt is produced through neutralization. As for this question, salt is produced by the reaction where hydrogen ions (H+) of an acid are replaced by the ions of metal (NH4+)
Answer: <span>B. hydrogen</span>
