The low vapor pressure of water preventing bodies of water from dying out.
Given the equation <span>aA + bB → cC + dD, which is an irreversible reaction, the most common rate laws are the product of the concentration of the reactants, each raised to a power.
This is the the general form of such laws.
r = K [A]^m * [B]^n
The order of the reaction is the sum of the exponents: m + n.
For first order reaction m+ n = 1, yields to the next potential laws:
m = 1, n = 0 => r = k [A]
m = 0, n = 1 => r = k [B]
m=0.5, n = 0.5 => r = [A]^0.5 [B]^0.5
And other combinations where the sum of the exponents are 1.
For second order reactions, m + n = 2, these are some potential laws:
m = 1, n = 1 => r = k[A][B]
m=0, n = 2 => r = k[B]^2
m=2, n = 0 => r = k[A]^2
m=1.5, n = 0.5 => r = k[A]^1.5 [B]^0.5
As you see there are many potential laws all of them with the form
r = [A]^m [B]^n, being the order of the reaction m + n
</span>
a) Answer:
= 225 mL
Explanation:
Using Boyle's law of gases;
The volume of a fixed mass of a gas is inversely proportional to its pressure at constant temperature.
Therefore;
P1V1 = P2V2
in this case; let the initial pressure be P;
Therefore; V1 = 450 mL, P1 = P, V2 = ? and P2 = 2P
Thus;
V2 = P1V1/P2
= (P×450)/ (2P)
= 225 mL
Therefore, the new volume will be 225 mL
b) <u>Answer</u>;
=1800 mL
<u>Explanation</u>;
Let the initial pressure be P;
Therefore; V1 = 450 mL, P1 = P, V2 = ? and P2 = 1/4P
Thus;
V2 = P1V1/P2
= (P×450)/(0.25P)
= 1800 mL
Thus, when the pressure is reduced to one-fourth of its original, the new volume will be 1800 mL.
Use the formula E=mc^2
energy given=<span>8.1 x 10^16 joules
</span>speed of <span>light = 3.00 × 10^8 m/s
</span>
plug in the values we'll get mass=<span>9.0 x 10-1 kg</span>
Answer:
The average is 63.6
Explanation:
<u>Step 1: Calculate the total points of all tests together</u>
The total of the 4 tests is : 83.2 points + 44.6 points + 74.4 points + 52.3 points = 254.5 points
<u>Step 2: Calculate the average points</u>
We have 4 tests so we divide the total number by 4
254.5 points / 4 = 63,625 points
<u>Step 3: take significant digits into account</u>
<em><u>Sum or difference :</u></em><u> </u>Add or subtract in the normal way, then round the answer to the LEAST number of places to the decimal point of any number in the problem
⇒ in this case : 83.2 + 44.6 + 74.4 + 52.3 = 254.5
<u>Multiplication and division:</u> the answer is reported in such a way that it reflects the reliability of the least precise operation. Your answer cannot be MORE precise than the least precise measurement.
254.5 / 4 = 63.6
