CHEMISTRY HIGH SCHOOL

If water were a nonpolar molecule, how would its properties be different?

Answers

Answer 1
Answer: If water was nonpolar, life as it exists now would be impossible. Water is the means by which ionic substances ( Fe^3+, Na^+, Ca^2+, K^+, etc) and polar molecules are distributed around and in the cells of organisms. 
Water is a major contributor to erosion of mountains because of its polar nature. It is able to dissolve almost all minerals because of its attraction for the positive and negative parts of the minerals that it encounters. 
If it was nonpolar, it would not exist in the solid and liquid state on earth. It is the attraction of the oppositely charged ends of different water molecules that makes it assume the liquid and solid state under the temperature ranges found on earth.

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Before free oxygen gas became abundant in the oceans and atmosphere, it reacted with a metal and produced what type of formations?a. the ionosphere
b. the ozone layer
c. banded iron formations
d. stromatolites

Answers

Before free oxygen gas became abundant in the oceans and atmosphere, it reacted with a metal and produced banded iron formations. 

Answer;

Banded iron formations

Before free oxygen gas became abundant in the oceans and atmosphere, it reacted with a metal and produced banded iron formations.

Explanation;

  • Cyanobacteria are thought to have introduced oxygen into the early atmosphere. This was important because oxygen played a key role in the evolution of eukaryotic organisms creating an ozone layer to shield life from UV rays.
  • Banded iron layers were formed in sea water as the result of oxygen released by the photosynthetic cyanobacteria.  As the photosynthetic organisms released oxygen, the available iron in the Earth's oceans precipitated out as iron oxides.

Carbon-14 has a half-life of 5715 years. If a 2.00g sample of Carbon-14 has decayed for 17145 years, how much of the sample remains?

Answers

The sample should have .25 g left. I did it and got the answer
N=0.25g

The wave-mechanical model of the atom is required to explain the(1) mass number and atomic number of an atom
(2) organization of atoms in a crystal
(3) radioactive nature of some atoms
(4) spectra of elements with multielectron atoms

Answers

Answer: option (4) spectra of elements with multielectron atoms.


Explanation:


1) The spectrum is the set of electromagnetic wave frequencies emitted by the atoms.


2) Such emssions are explained by the wave-mechanical model of the atom as the release of energy (photons, which is the same that light) when an excited electron jumps into a lower energy level.


3) As per the wave-mechanical model of the atom, the electrons are not able to occupy any position around tha atom, but some specific energy levels, and it is the change of energy level (jump of the electrons from one level to other) what produces the spectrum.

Final answer:

The wave-mechanical model of the atom explains the spectra of elements with multielectron atoms by describing electrons as wave-like particles with discrete energy levels. This leads to the unique patterns of spectral lines observed for different elements.

Explanation:

The wave-mechanical model of the atom is used to explain the spectra of elements with multielectron atoms. The model, also known as the quantum mechanical model, describes electrons as wave-like particles with discrete energy levels. These energy levels give rise to the unique spectral lines observed for different elements.

For example, when an electron in an atom absorbs energy, it jumps to a higher energy level. When it returns to its original energy level, it releases the absorbed energy in the form of light. Each element has its own set of energy levels, leading to a unique pattern of spectral lines.

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1. What kind of diagram shows how energy flows from one organism to another?a. producer c. consumer
b. ecology d. food chain

Answers

It would be D.the food chain

List down the types of intermolecular forces that exist between molecules (or basic units) in the species given below: (a) benzene (C6H6), (b) CH3Cl, (c) PF3, (d) NaCl, (e) CS2

Answers

(a) benzene (C6H6) - nonpolar molecules . Only dispersion forces are present.

(b) CH3Cl -  Chloroform ; polar molecules. Both dispersion and dipole-dipole forces are present.

(c) PF3 -  Phosphorus triflouride ; has polar bonds but has nonpolar molecule due to its symmetrical structure. Only dispersion forces are present.

(d) NaCl - Sodium chloride ; ionic compound. Both ion-ion and dispersion forces are present.

(e) CS2 - Carbon disulfide ; nonpolar molecules. Only dispersion forces are present.

Molecular compounds do not conduct electricity because they a. do not break up into ions. b. have high melting points. c. do not dissolve in water. d. break up into ions.

Answers


A. they don't break up and since there are two options that contradict each other its easy.

Molecular compounds can not conduct electricity because they do not break up into ions. Therefore, option (A) is correct.

What are molecular compounds?

Molecular compounds can be characterized as those compounds where the atoms are connected by covalent bonds. The covalent bond is generally created by the mutual sharing of electrons by the atoms. In molecular compounds, intermolecular forces are responsible for bond formation.

The melting point of the molecular compound is low as compared to the ionic compound as the energy required to break bonds is less compared to the ionic bond between ions in the crystalline ionic compound.

Molecular compounds are generally by the reaction between non-metals. Molecular compounds are also known as covalent compounds. The ionic and molecular compound differ from each in their physical properties,

The molecular compounds do not conduct electricity as they do not bark into ions. Therefore they can behave as insulators while ionic compounds conduct electricity.

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