Answer:
See explanation
Explanation:
a) Isotopes are variants of one chemical element which (such as Nitrogen in this case). Those variants differ in <u>neutron number</u> and <u>nucleon number</u>.
This is also the reason why they have <u>different masses</u>. Isotopes are different physically to their original atoms.
b) All isotopes of a given element have the same number of protons and electrons. All the isotopes have the same atomic number as the original element. Isotopes are almost the same chemically.
c) The 14 in the name of Nitrogen-14, means it has a mass of 14u ( while Nitrogen 15 has a mass of 15 u). Nitrogen-14 will have the greatest affect on the average atomic mass, this because of the 95% abundance.
Nitrogen has an average atomic mass of 14.0067 u. This is the closest to 14, what shows nitrogen-14 has the biggest affect.
The average atomic mass is calculated as following: 14*0.95 +15*0.03 + 16*0.02 =14.07 u
d) Both are isotopes, but of another element. They both have a mass of 14 u. Bu they have a different number of neutrons: Oxygen-14 has 6 neutrons and 8 protons while Nitrogen-14 has 7 neutrons and 7 protons. This means oxygen-14 and nitrogen-14 are not isotopes, since isotopes do have the same number of neutrons.
The correct answer is A.
Electrochemistry: the study of electrical and chemical occurrences or phenomena
Since the number on top is the mass number (number of neutrons and protons) while the number at the bottom is the atomic number ( number of protons)
A) 13 protons, 14 neutrons (27-13)
For the number of electrons it has to be equal to the number of protons if the atom is uncharged.
Therefore you have 13 electrons.
B) 17 protons, 18 neutrons (35-17)
18 electrons
C) What is the atomic number of Sulphur - need slightly more info
Answer: The activation energy for the reaction is 209 kJ
Explanation:
According to the Arrhenius equation,
or,
where,
= rate constant at =
= rate constant at =
= activation energy for the reaction = ?
R = gas constant = 8.314 J/mole.K
= initial temperature =
= final temperature =
Now put all the given values in this formula, we get
:
Therefore, the activation energy for the reaction is 209 kJ