CHEMISTRY HIGH SCHOOL

The atomic mass of an element is defined as the weighted average mass of that element’sa. naturally occurring isotopes

b. least abundant isotope

c. radioactive isotopes

d. most abundant isotope

Answers

Answer 1

Answer:

Answer:

I say its A.

But im not EXTREMELY sure

Explanation:

Answer 2

Answer:

Answer:

A. Naturally ocuring isotopes

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A new potential heart medicine, code-named X-281, is being tested by a pharmaceutical company, Pharma-pill. As a research technician at Pharma-pill, you are told that X-281 is a monoprotic weak acid, but because of security concerns, the actual chemical formula must remain top secret. The company is interested in the drug's Ka value because only the dissociated form of the chemical is active in preventing cholesterol buildup in arteries.To find the pKa of X-281, you prepare a 0.089 M test solution of X-281 at 25.0 ∘C. The pH of the solution is determined to be 2.40. a. What is the pKa of X-281? Express your answer numerically.At 25∘C, for any conjugate acid-base pairpKa + pKb = 14.00b. What is pKb of the conjugate base of X-281? (Assume 25 ∘C.) Express your answer numerically.
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What is a radioactive idotope?

Answers

an isotope is when a normal atom has too many neutrons and its weight has been offset.

natural or artificially created isotope of a chemical element having an unstable nucleus that decays

Why do we crack molecules?

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We need to crack molecules in order for us to get the desired molecule. For example, in the extraction of crude oil, after entering the fractional distillation, it will give products base on their molecular structure. The products are gasoline, diesel fuel, jet fuel, wax, asbestos,kerosene.

cracking is the process whereby complex organic molecules such as kerogens or long chain hydrocarbons are broken down into simpler molecules such as light hydrocarbons,.
it is done to get more important substances

Is cloth a good insulator

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cloth can be a great choice for green and chemical-free insulation in the home. using cloth as in insulator help keeps fabric scraps out of landfill and minimizes exposure to harmful chemicals common in modern insulation.

Yes, since the conductivity of cloth is very small electrons wont be able to pass freely thought the material.

17. Which type of chemical bond is formed between two atoms of bromine?

Answers

A non polar bond is formed between two bromine atoms. That means that the electrons are shared equally between the two atoms, and since we are sharing electrons, we use the term, 'covalent bond'.

What increases the salinity of the ocean surface water, causing it to sinkdownward?
Help

Answers

Answer:

Thermohaline Circulation

Explanation:

The process is known as “Thermohaline Circulation”. In the Earth’s polar regions ocean water gets very cold, forming sea ice. As a consequence the surrounding seawater gets saltier, because when sea ice forms, the salt is left behind. As the seawater gets saltier, its density increases, and it starts to sink.

What element has the electron configuration 1s2 2s2 2p6 3s2 3p2?

Answers

The sulfur (S) element of the periodic table is represented by the electron configuration $1s^2 2s^2 2p^6 3s^2 3p^2$ .

The arrangement of electrons within the energy levels or orbitals of an atom is represented by electronic configuration. Sulfur has 16 electrons in its structure. The numbers in the electronic configuration represent the principal energy levels—1, 2, and 3—as well as the orbital—s or p—that the electrons are in.

Detail analysis of electron arrangement:

The first energy level (n = 1) represents the presence of two electrons in the symbol $1s^2$ 1s orbital.
The symbol $2s^2$ indicates the presence of two electrons in the second energy level (n = 2) and the 2s orbital.
The $2p^6$ symbol indicates the presence of 6 electrons in the second energy level (n = 2) and 2p orbitals.
The third energy level, or $3s^2$ , refers to the presence of two electrons in the 3s orbital (n = 3).
$3p^2$ stands for the third energy level (n = 3), and indicates that two of the three p orbitals hold two electrons.