Two most abundant elements in Earth's core are

Answers

Answer 1

Answer: Iron accounts for about 86% of the Earth's core and Silicon is next at only 6%. Iron is by far the most abundant element in the Earth's core.

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What similarities do nuclear energy and chemical energy share?

Answers

atoms can be the source of both nuclear and chemical energy. Nuclear energy involves the atom's nucleus; chemical energy involves the atom's electrons—subatomic particles that surround the nucleus.

Both are types of potential energy, and Involve stored energy.

An electron in an atom moves from the ground state to an excited state when the energy of the electron(1) decreases
(2) increases
(3) remains the same

Answers

The answer is (2) increases. The definition of excited state is that the electrons have higher energy than ground state. For comprehension, the excited state is ready for reaction so it has higher energy.

An electron in an atom moves from a ground state to an excited state when the electron energy increases

Further Explanation

Excitation in physics is the addition of a number of discrete energies (called excitation energies) to a system — such as the nucleus of an atom, atom, or molecule — so as to produce a change, usually from the lowest energy state (ground state) to one of the higher energies (excited state).

In nuclear, atomic and molecular systems, excited states do not continue to be distributed but instead have certain discrete energy values. Thus, external energy (excitation energy) can be absorbed in discrete quantities.

Excitation energy is stored in excited atoms and the nucleus that emits light is usually seen from atoms and as gamma radiation from the nucleus because they return to the ground state. This energy can also be lost by collisions.

In the nucleus, energy is absorbed by protons and neutrons which are transferred to an excited state. Within a molecule, energy is absorbed not only by electrons, which are very enthusiastic for higher energy levels but also by whole molecules, which are highly excited for the discrete states of vibration and rotation.

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Electron moves brainly.com/question/496960

Excitation brainly.com/question/496960

Details

Class: High School

Subject: Chemistry

Keywords: electron, excitation, energies

What is the molality of a solution

Answers

Answer:

The formula for molality is m = moles of solute / kilograms of solvent. In problem solving involving molality, we sometimes need to use additional formulas to get to the final answer. One formula we need to be aware of is the formula for density, which is d = m / v, where d is density, m is mass and v is volume

Explanation:

it is a measure of the concentration of a solute in a solution in terms of amount of substance in a specified amount of mass of the solvent. This contrasts with the definition of molarity which is based on a specified volume of solution.

What is the volume of 2.10 moles of chlorine gas (Cl2) at 273 K and 1.00 atm?10.7 L
22.4 L
47.1 L
82.0 L

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I think the answer is 47.1 . I'm not sure. Iv'e done it before but I haven't got my grade for the answer yet. Hope this right and hope it helps!

Is zinc coMpund Plz help me

Answers

Answer:

it is indeed a compound

Explanation:

Zinc is NOT a compound.

A compound contains two or more elements or molecules like H2O. Where H is 1 element and Oxygen is another and together they make a compound.

Zinc itself is a single molecule (or element) and can be used in a compound like ZnO (zinc oxide)

What is the molar mass of a substance

Answers

Molar mass of a molecule is the sum of the atomic mass of the individual elements in the molecule.

Atomic mass of Pb = 207 amu

Atomic mass of N = 14 amu

Atomic mass of O = 16 amu

Here amu stands for atomic mass unit

Molar mass of Pb(NO₃)₂ = 207 + [14 + (16 x 3)] x 2

= 207 + 28 + (48) x 2 = 331 g/mol

The mass of an element in the periodic table

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