Answer:
a and d
Explanation:
boiling is a chemical change ans rottong is a chemcal change, both requiring heat
Answer:
Cells and organisms maintain a fairly constant internal environment
Explanation:
CFCs and their associated compounds were developed in the early 1900s as a non-toxic, non-flammable solution to other more dangerous products such as ammonia.
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
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