Answer:
(D)
Explanation:
Acids are the species which furnish hydrogen ions in the solution or is capable of forming bonds with electron pair species as they are electron deficient species.
When an acid donates a proton, it changes into a base which is known as its conjugate base.
Bases are the species which furnish hydroxide ions in the solution or is capable of forming bonds with electron deficient species as they are electron rich species. When a base accepts a proton, it changes into a acid which is known as its conjugate acid.
The acid and the base which is only differ by absence or presence of the proton are known as acid conjugate base pair.
Thus,
(A) does not have any conjugate base.
(B) is a base and does not have any conjugate base.
(C) The conjugate base of the acid, is but not vice versa.
(D) The conjugate base of the acid, is
(E) is a acid conjugate base pair.
Hence, (D) is the answer.
I’m pretty sure the answer would be B.
The electron configuration filling patterns of some elements in group 6b(6) and group 1b(11) reflect the increasing stability of half-filled and completely filled sublevels.
<h2>
What is electronic configuration?</h2>
The distribution of electrons in an element's atomic orbitals is described by the element's electron configuration. Atomic subshells that contain electrons are placed in a series, and the number of electrons that each one of them holds is indicated in superscript for all atomic electron configurations. For instance, sodium's electron configuration is 1s22s22p63s1.
Almost all of the elements write their electronic configurations in the same style. When the energies of two subshells differ, an electron from the lower energy subshell occasionally goes to the higher energy subshell.
This is due to two factors:
Symmetrical distribution: As is well known, stability is a result of symmetry. Because of the symmetrical distribution of electrons, orbitals where the sub-shell is exactly half-full or totally filled are more stable.
Energy exchange: The electrons in degenerate orbitals have a parallel spin and are prone to shifting positions. The energy released during this process is simply referred to as exchange energy. The greatest number of exchanges occurs when the orbitals are half- or fully-filled. Its stability is therefore at its highest.
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Answer:
a) λ = 0.0244 y⁻¹
b) 627 g
c) 11.8 years
d) 28.4 years
Explanation:
Strontium 90 is a radioactive material that decays according to the function
where,
A(t) is the amount present at time t (in years)
A₀ is the initial amount present
0.0244 is the decay rate λ
<em>Assume that a scientist has a sample of 800 grams of strontium 90. (a) What is the decay rate of strontium 90?</em>
<em>(a) What is the decay rate of strontium 90?</em>
According to the exponential decay function, the decay rate is λ = 0.0244 years⁻¹
<em>(b) How much strontium 90 is left after 10 years?</em>
If A₀ is 800 g and t is 10 years, A(t) is:
<em>(c) When will only 600 grams of strontium 90 be left?</em>
If A₀ is 800 g and A(t) is 600 g, t is:
<em>(d) What is the half-life of strontium 90?</em>
We can calculate half-life using the following expression.
Yes, ADI (Accepted Daily Intake) values are accepted in the United States.
ADI is a result of toxicity studies or other toxicology information for direct food additive or color additive used in food. The ADI is based on the dose level of the additive in animal studies that was shown to cause no adverse effect, multiplied an appropriate safety factor (often 1/100). Prolonged ingestion of the additive at the ADI value is considered cause no harm.