Here we have to discuss the understanding of world through radiocarbon or uranium.
The radiocarbon or uranium helps us to determine the age of the world.
All uranium or radiocarbon elements after ejecting the radioactive rays convert to non-radioactive element lead (²⁰⁸Pb). If we assume that during the generation of world there were not any amount of lead was present i.e. only uranium or radiocarbon was present. Then by analysis of any uranium or radiocarbon at the present date one can determine the age of the world as follows:
In present moment we know that the ratio of uranium (U) and lead (Pb) in any uranium ore is 10:3 (gram atom ratio)
So, 
= 
Therefore, from the equation: ln
= λt (where λ = rate of dissociation of uranium, t = time); we can write:
t = λ⁻¹ ln = λ⁻¹ln
.
On plugging the dissociation rate of uranium we can obtain the age of the world, which is nearly 1.5×10⁹ years.
Thus the use of radioactive element to understand the world is explained.
Answer:
6 elements which are carbon, hydrogen, nitrogen, oxygen, sulfur and phosphorus
Explanation:
Living organisms are made up of various unit of giant organic molecules that have been produced through life processes.
The bulk of elements that makes up living organisms are carbon, hydrogen, nitrogen, oxygen, sulfur and phosphorus.
Carbon is almost present everywhere in living organisms. It's unique ability to form a key component lies on its bond formation capabilities. Carbon is found in nearly all organic molecules like carbohydrates, proteins, fats and oils, e.t.c
Hydrogen like carbon is key to life. It is light and making it form different bond types with carbon. It is one of the atoms that makes up water.
Nitrogen is usually found in proteins. They are unique elements that life cannot do without.
Oxygen is useful in respiration processes and it is the bedrock through which energy is released from glucose.
Sulfur is key to life.
Phosphorus in Adenosine Diphosphate is a good store of energy.
The correct answer is false.
This requires familiarity with the different theories (or concepts) of acids and bases.
On the Arrhenius concept, an acid is a substance that produces an H⁺ ion in water such that the H⁺ concentration increases, and a base is a substance that produces an OH⁻ ion in water such that the OH⁻ concentration increases.
On the Brønsted–Lowry concept, an acid is a substance that donates a proton (which is basically an H⁺ ion) in a solvent, and a base is a substance that accepts a proton in a solvent.
On the Lewis concept, an acid is a substance that accepts an electron pair in a solvent, and a base is a substance that donates an electron pair in a solvent.
The concepts become progressively broader, i.e., the Arrhenius concept is the most restrictive and the Lewis concept is the least restrictive. As a corollary, an Arrhenius acid or base is also both a Brønsted–Lowry acid or base and a Lewis acid or base, respectively; a Brønsted–Lowry acid or base is not necessarily an Arrhenius acid or base, but an Arrhenius acid or base is also a Lewis acid or base, respectively. And finally, a Lewis acid or base may not necessarily be either an Arrhenius or a Brønsted–Lowry acid or base.
So, with the above concepts in mind, we can match the statements in column A with the type of acid or base in column B:
Answer:
balanced
Explanation:
its balance since all the elments add up on both sides
