Imagine an element, X, that has two naturally occurring

Chemistry

1 answer:

Mrac [35]2 years ago

3 0

The characteristics of the percentage allow finding that the abundance of the second isotope is

b = 100 - a%

Chemical elements are stable structures that appear in the periodic table, these structures can have some variations, changing the number of protons changes the type of chemical element, but changing the number of neutrons, with the same atomic number, the elements with all their hardware properties, this type of atoms is called isotopes.

In this case it is said that the element X has two isotopes, if the abundance of one of them is a, the sum of all the abundances must give the total value of 1 or 100%,

the total abundance is

1 = a + b

b = 1- a

this is the abundance of the other isotope, if you prefer it can be given as a percentage

b = 100 - a%

In conclusion using the characteristics of the percentage we can find the abundance of the second isotope is

b = 100 - a%

learn more about percentage here:

brainly.com/question/21814361

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Consider the reaction pathway graph below.

igomit [66]

Answer:

subtract E from D

Explanation:

The graph shown the potential energy diagram of the reaction "reaction pathway".

X-axis represents the reaction progress, the transformation from the reactants to the products passing via the transition state.

Y-axis represents the potential energy of the reactants and the products and also the intermediate.

As clear from the attached image "F" represents the position of the reactants of the reaction, "B" represents the position of the intermediate/transition state and "G" represents the position of the products of the reaction.
Region "A" is the potential energy difference between the intermediate "B" and the reactants "F" which represents the activation energy of the reaction "Ea". Activation energy "Ea" can be defined as the minimum energy that the reactants should posses to initiate the reaction.
Region "C" is the potential energy difference between the reactants "F" and the products "G" which represents the enthalpy change of the reaction "ΔH".
<em>ΔH = pot. energy of the products "G" - pot. energy of the reactants "F".</em>
If "ΔH" is positive this means that the reaction is endothermic and this occurs when the potential energy of the products is greater than that of the reactants.

If "ΔH" is negative this means that the reaction is exothermic and this occurs when the potential energy of the products is smaller than that of the reactants.
In our example, It is obvious that the energy of the reactants is greater than the potential energy of the products.

So, ΔH will have a negative value which means that the reaction is exothermic reaction.
<em>Thus, the right choice is: "subtract E from D" would provide evidence to support the inference that this is an exothermic reaction.</em>