Water has a simple molecular structure composed of one oxygen atom covalently bonded to two hydrogen atoms. This gives water a polar molecular structure with partial positive charges near the hydrogen atoms and a partial negative charge near the oxygen atom. This polarity allows water to dissolve ionic compounds through electrostatic interactions between the ions and polar water molecules, but not non-polar covalent compounds which do not interact strongly with water. Heavy water, composed of deuterium instead of hydrogen, is used as a neutron moderator in nuclear reactions and to produce deuterium through electrolysis or reaction with metals.
It reasonably can be argued that that most participants in the roofing, building and design trades tend to either take water for granted or lack the basic understanding of both the chemistry and physics that play such a large role in water accumulation within a building enclosure. Sure, people in the construction business fear the effects of excess water, but few have taken the time to understand why it acts the way it does.
The driving forces that cause moisture movement are fundamental properties of nature; therefore, preventing water infiltration and resulting damage at the typical building project requires close attention during the design and construction processes to all potential moisture sources and routes.
Seven fundamental aspects of water are presented in Water 101 to provide Trinity | ERD forensic personnel and our clients an essential knowledge base for the physical properties of water.
It reasonably can be argued that that most participants in the roofing, building and design trades tend to either take water for granted or lack the basic understanding of both the chemistry and physics that play such a large role in water accumulation within a building enclosure. Sure, people in the construction business fear the effects of excess water, but few have taken the time to understand why it acts the way it does.
The driving forces that cause moisture movement are fundamental properties of nature; therefore, preventing water infiltration and resulting damage at the typical building project requires close attention during the design and construction processes to all potential moisture sources and routes.
Seven fundamental aspects of water are presented in Water 101 to provide Trinity | ERD forensic personnel and our clients an essential knowledge base for the physical properties of water.
This is a presentation about the Chemical Structure of Water.
Coures: The Water
Unit one: The Physical and Chemical Properties of Water
Topic: Waht is Water
Biochemistry of water - presentation given by Dr. Karthikeyan Pethusamy at department of biochemistry, Maulana Azad Medical College. To make slides simple, less information is given in slides. More information was shared during the presentation.
The ability of water to form hydrogen bonds gives it amazing properties including: ability to dissolve hydrophilic (ionic and polar) but not hydrophobic (nonionic, nonpolar) molecules so as to be the "universal solvent," liquid state over large earthly temperature range, high heats of fusion and vaporization, high specific heat, high surface tension, cohesion and adhesion, lower density as solid, low viscosity, equal ionization into proton donor and acceptor for neutral pH. These properties make life on earth possible
This is a presentation about the Chemical Structure of Water.
Coures: The Water
Unit one: The Physical and Chemical Properties of Water
Topic: Waht is Water
Biochemistry of water - presentation given by Dr. Karthikeyan Pethusamy at department of biochemistry, Maulana Azad Medical College. To make slides simple, less information is given in slides. More information was shared during the presentation.
The ability of water to form hydrogen bonds gives it amazing properties including: ability to dissolve hydrophilic (ionic and polar) but not hydrophobic (nonionic, nonpolar) molecules so as to be the "universal solvent," liquid state over large earthly temperature range, high heats of fusion and vaporization, high specific heat, high surface tension, cohesion and adhesion, lower density as solid, low viscosity, equal ionization into proton donor and acceptor for neutral pH. These properties make life on earth possible
Several emergent properties of water contribute to the suitability of (1).pdfakshoes
Several emergent properties of water contribute to the suitability of the environment for life.
How does the ability of water to function as a versatile solvent arise from the structure of water
molecule Select all that apply. Water molecules form hydrogen bonds with atoms that are part of
polar covalent bonds in other molecules. Water's versatility as a solvent arises from the polar
covalent bonds of water molecules. The partially charged regions of water molecules are
attracted to oppositely charged ions. The partial positive regions of water molecules are attracted
to negatively charged ions, forming oxygen shells around ions that separate them from each
other and dissolve them. Hydrogen has higher electronegativity, so the shared electrons are
attracted more to the oxygen at the apex of this V-shaped molecule. X Incorrect; Try Again; 4
attempts remaining.
Explain how water interacts with the following types of compounds to.pdfarmyshoes
Explain how water interacts with the following types of compounds to influence their water
solubility.
1.Compounds that can hydrogen bond
2. Compounds that are polar but cannot hydrogen bond
3. Compounds that are non-polar
4. Compounds that dissociate into cations and anions.
Thank you so much.
Solution
Compounds that can hydrogen bond
Water tends to disassociate into H+ and OH- ions. In this disassociation, the oxygen retains the
electrons and only one of the hydrogens, becoming a negatively charged ion known as
hydroxide. Pure water has the same number (or concentration) of H+ as OH- ions. Acidic
solutions have more H+ ions than OH- ions. Basic solutions have the opposite. An acid causes an
increase in the numbers of H+ ions and a base causes an increase in the numbers of OH- ions.
Water, which not only dissolves many compounds but also dissolves more substances than any
other liquid, is considered the universal solvent. A polar molecule with partially-positive and
negative charges, it readily dissolves ions and polar molecules. Water is therefore referred to as a
solvent: a substance capable of dissolving other polar molecules and ionic compounds.
The charges associated with these molecules form hydrogen bonds with water, surrounding the
particle with water molecules. This is referred to as a sphere of hydration, or a hydration shell,
and serves to keep the particles separated or dispersed in the water.
Compounds that dissociate into cations and anions.-When ionic compounds are added to water,
individual ions interact with the polar regions of the water molecules during the dissociation
process, disrupting their ionic bonds. Dissociation occurs when atoms or groups of atoms break
off from molecules and form ions. Consider table salt (NaCl, or sodium chloride): when NaCl
crystals are added to water, the molecules of NaCl dissociate into Na+ and Cl– ions, and spheres
of hydration form around the ions. The positively-charged sodium ion is surrounded by the
partially-negative charge of the water molecule\'s oxygen; the negatively-charged chloride ion is
surrounded by the partially-positive charge of the hydrogen in the water molecule.
Compounds that are polar and non-polar-
-Since many biomolecules are either polar or charged, water readily dissolves these hydrophilic
compounds. Water is a poor solvent, however, for hydrophobic molecules such as lipids.
Nonpolar molecules experience hydrophobic interactions in water: the water changes its
hydrogen bonding patterns around the hydrophobic molecules to produce a cage-like structure
called a clathrate. This change in the hydrogen-bonding pattern of the water solvent causes the
system\'s overall entropy to greatly decrease, as the molecules become more ordered than in
liquid water. Thermodynamically, such a large decrease in entropy is not spontaneous, and the
hydrophobic molecule will not dissolve.
-Polar substances tend to dissolve well in other polar substances, but not nonpolar substances,
whil.
NaCl Its the coulombic interaction between Na.pdfanjanaarts2014
NaCl : It\'s the coulombic interaction between Na+ and Cl- due to which crystal
exists. It\'s not ionic intereaction. It\'s ionic interaction. (very strong). NaCl dissolves in water.
It\'s not due to hydrogen bonding. It\'s due to strong ion-dipole interactions. Initially, the
positive and negative ion are only attracted to each other. The water molecules are hydrogen
bonded to each other. If the crystal is to dissolve, these bonds must be broken. Negative chloride
ions on the surface are attracted by neighboring positive sodium ions and by the partially positive
hydrogen atom in the polar water molecule (See the graphic on the left). Similarly, the positive
sodium ions are attracted by both chloride ions and the partially negative oxygen atom in the
polar water molecule. A \"tug-of-war\" occurs for the positive and negative ions between the
other ions in the crystal and the water molecules. Several water molecules are attracted to each of
the ions. Whether the crystal dissolves is determined by which attractive force is stronger. If the
internal ionic forces in the crystal are the strongest, the crystal does not dissolve. This is the
situation in reactions where precipitates form. If the attractions for the ions by the polar water
molecules are the strongest, the crystal will dissolve. This is the situation in sodium chloride.
Once the ions are released from the crystals, the ions are completely surrounded by water
molecules. Note that the proper atom in the water molecule must \"point\" toward the correct ion.
The charge principle and the partial charges in the polar molecule determine the correct
orientation. Partially negative oxygen atoms in the water molecule interact with the positive
sodium ion. Partially positive hydrogen atoms in the water molecule interact with the negative
chloride ion. Sugar : The interaction between sugar molecule and water is greater than between
sugar molecules. So When sugar is put into water, it likes to form hydrogen bonds with water. So
it breaks glycosidic linkages and forms hydrogen bonds with water. Initially it separates into
polymer sugar chains, but later it dissociates into individual molecules.
Solution
NaCl : It\'s the coulombic interaction between Na+ and Cl- due to which crystal
exists. It\'s not ionic intereaction. It\'s ionic interaction. (very strong). NaCl dissolves in water.
It\'s not due to hydrogen bonding. It\'s due to strong ion-dipole interactions. Initially, the
positive and negative ion are only attracted to each other. The water molecules are hydrogen
bonded to each other. If the crystal is to dissolve, these bonds must be broken. Negative chloride
ions on the surface are attracted by neighboring positive sodium ions and by the partially positive
hydrogen atom in the polar water molecule (See the graphic on the left). Similarly, the positive
sodium ions are attracted by both chloride ions and the partially negative oxygen atom in the
polar water molecule. A \"tug-of-war\" occurs for.
Water is a good solvent due to its polarity. The oxygen atom in wate.pdfgulshan16175gs
Water is a good solvent due to its polarity. The oxygen atom in water attracts the electrons more
strongly than the hydrogen atoms. Hence the molecule has partial positive and partial negative
ends.
This allows water molecules to seperate polar solute molecules.
When a solute is dissolved in water, the solvent molecules surround the solute molecule. The
relative small size of water molecules enable many of them to surround one solute molecule.
Ionic substances dissociate to charged ions while covalent substances which are polar have
charged ends. This allows for water (a polar solvent) to easily dissolve such substances. Hence
ionic substance and polar covalent substances dissolve easily in water.
Solution
Water is a good solvent due to its polarity. The oxygen atom in water attracts the electrons more
strongly than the hydrogen atoms. Hence the molecule has partial positive and partial negative
ends.
This allows water molecules to seperate polar solute molecules.
When a solute is dissolved in water, the solvent molecules surround the solute molecule. The
relative small size of water molecules enable many of them to surround one solute molecule.
Ionic substances dissociate to charged ions while covalent substances which are polar have
charged ends. This allows for water (a polar solvent) to easily dissolve such substances. Hence
ionic substance and polar covalent substances dissolve easily in water..
Operation “Blue Star” is the only event in the history of Independent India where the state went into war with its own people. Even after about 40 years it is not clear if it was culmination of states anger over people of the region, a political game of power or start of dictatorial chapter in the democratic setup.
The people of Punjab felt alienated from main stream due to denial of their just demands during a long democratic struggle since independence. As it happen all over the word, it led to militant struggle with great loss of lives of military, police and civilian personnel. Killing of Indira Gandhi and massacre of innocent Sikhs in Delhi and other India cities was also associated with this movement.
2024.06.01 Introducing a competency framework for languag learning materials ...Sandy Millin
http://sandymillin.wordpress.com/iateflwebinar2024
Published classroom materials form the basis of syllabuses, drive teacher professional development, and have a potentially huge influence on learners, teachers and education systems. All teachers also create their own materials, whether a few sentences on a blackboard, a highly-structured fully-realised online course, or anything in between. Despite this, the knowledge and skills needed to create effective language learning materials are rarely part of teacher training, and are mostly learnt by trial and error.
Knowledge and skills frameworks, generally called competency frameworks, for ELT teachers, trainers and managers have existed for a few years now. However, until I created one for my MA dissertation, there wasn’t one drawing together what we need to know and do to be able to effectively produce language learning materials.
This webinar will introduce you to my framework, highlighting the key competencies I identified from my research. It will also show how anybody involved in language teaching (any language, not just English!), teacher training, managing schools or developing language learning materials can benefit from using the framework.
Honest Reviews of Tim Han LMA Course Program.pptxtimhan337
Personal development courses are widely available today, with each one promising life-changing outcomes. Tim Han’s Life Mastery Achievers (LMA) Course has drawn a lot of interest. In addition to offering my frank assessment of Success Insider’s LMA Course, this piece examines the course’s effects via a variety of Tim Han LMA course reviews and Success Insider comments.
Macroeconomics- Movie Location
This will be used as part of your Personal Professional Portfolio once graded.
Objective:
Prepare a presentation or a paper using research, basic comparative analysis, data organization and application of economic information. You will make an informed assessment of an economic climate outside of the United States to accomplish an entertainment industry objective.
Model Attribute Check Company Auto PropertyCeline George
In Odoo, the multi-company feature allows you to manage multiple companies within a single Odoo database instance. Each company can have its own configurations while still sharing common resources such as products, customers, and suppliers.
The Roman Empire A Historical Colossus.pdfkaushalkr1407
The Roman Empire, a vast and enduring power, stands as one of history's most remarkable civilizations, leaving an indelible imprint on the world. It emerged from the Roman Republic, transitioning into an imperial powerhouse under the leadership of Augustus Caesar in 27 BCE. This transformation marked the beginning of an era defined by unprecedented territorial expansion, architectural marvels, and profound cultural influence.
The empire's roots lie in the city of Rome, founded, according to legend, by Romulus in 753 BCE. Over centuries, Rome evolved from a small settlement to a formidable republic, characterized by a complex political system with elected officials and checks on power. However, internal strife, class conflicts, and military ambitions paved the way for the end of the Republic. Julius Caesar’s dictatorship and subsequent assassination in 44 BCE created a power vacuum, leading to a civil war. Octavian, later Augustus, emerged victorious, heralding the Roman Empire’s birth.
Under Augustus, the empire experienced the Pax Romana, a 200-year period of relative peace and stability. Augustus reformed the military, established efficient administrative systems, and initiated grand construction projects. The empire's borders expanded, encompassing territories from Britain to Egypt and from Spain to the Euphrates. Roman legions, renowned for their discipline and engineering prowess, secured and maintained these vast territories, building roads, fortifications, and cities that facilitated control and integration.
The Roman Empire’s society was hierarchical, with a rigid class system. At the top were the patricians, wealthy elites who held significant political power. Below them were the plebeians, free citizens with limited political influence, and the vast numbers of slaves who formed the backbone of the economy. The family unit was central, governed by the paterfamilias, the male head who held absolute authority.
Culturally, the Romans were eclectic, absorbing and adapting elements from the civilizations they encountered, particularly the Greeks. Roman art, literature, and philosophy reflected this synthesis, creating a rich cultural tapestry. Latin, the Roman language, became the lingua franca of the Western world, influencing numerous modern languages.
Roman architecture and engineering achievements were monumental. They perfected the arch, vault, and dome, constructing enduring structures like the Colosseum, Pantheon, and aqueducts. These engineering marvels not only showcased Roman ingenuity but also served practical purposes, from public entertainment to water supply.
Unit 8 - Information and Communication Technology (Paper I).pdfThiyagu K
This slides describes the basic concepts of ICT, basics of Email, Emerging Technology and Digital Initiatives in Education. This presentations aligns with the UGC Paper I syllabus.
Biological screening of herbal drugs: Introduction and Need for
Phyto-Pharmacological Screening, New Strategies for evaluating
Natural Products, In vitro evaluation techniques for Antioxidants, Antimicrobial and Anticancer drugs. In vivo evaluation techniques
for Anti-inflammatory, Antiulcer, Anticancer, Wound healing, Antidiabetic, Hepatoprotective, Cardio protective, Diuretics and
Antifertility, Toxicity studies as per OECD guidelines
2. The polarity of water:
Water has a simple molecular structure. It is composed of one oxygen
atom and two hydrogen atoms. Each hydrogen atom is covalently
bonded to the oxygen via a shared pair of electrons. Oxygen also has
two unshared pairs of electrons. Thus there are 4 pairs of electrons
surrounding the oxygen atom, two pairs involved in covalent bonds
with hydrogen, and two unshared pairs on the opposite side of the
oxygen atom. Oxygen is an "electronegative" or electron "loving" atom
compared with hydrogen.
3. Water is a "polar" molecule, meaning that there is an uneven
distribution of electron density. Water has a partial negative charge ()
near the oxygen atom due the unshared pairs of electrons, and partial
positive charges( ) near the hydrogen atoms.
An electrostatic attraction between the partial positive charge near the
hydrogen atoms and the partial negative charge near the oxygen results
in the formation of a hydrogen bond.
The ability of ions and other molecules to dissolve in water is due to
polarity. For example, in the illustration below sodium chloride is
shown in its crystalline form and dissolved in water
4. Solvent property of water:
In general, water is good solvent for ionic compounds, but a poor one
for covalent compounds.
Solubility of ionic compounds:
When an ionic compound like NaCl is put in a polar solvent like water,
the electrostatic force of attraction existing between the ions in the
crystal lattice is considerably weekend and rapture by water due to its
high dielectric constant.
The ions of a salt are held together by ionic forces as defined by
Coulomb’s Law.
5.
6. The large dielectric constant of water means that the force between
the ions in a salt is very much reduced permitting the ions to separate.
These separated ions become surrounded by the oppositely charged
ends of the water dipoles and become hydrated. Thus the Na+ and Cl-
ions will be torn apart from the crystal lattice. The negative ion is
attracted by the positive pole of the solvent molecule and the positive
ion by the negative pole of the solvent molecule.
7.
8. Thus the water molecules pull the ions of the crystal apart and the
electrostatic force of attraction existing between the ions of the crystal
are cut off. Further the ions are surrounded by the water molecules
which act as a sheath (or envelope) around the ions and prevent the
recombination of the ions. The ions thus may freely in the solution are
said to be hydrated.
9. • Insolubility of some ionic compounds:
Some ionic compounds like AgCl, BaSO4 etc are insoluble in water. It is
because there are strong attractive forces in their crystal lattice and the
dielectric constant of water is unable to rapture them.
10. Solubility of some polar covalent compounds:
Some polar organic compounds like alcohols, sugar and dissolve in
water because they can strongly interact with water molecule through
the formation of hydrogen bonds.
11.
12. • Insolubility of non-polar covalent compounds: several non-polar
covalent compounds like benzene, CCl4, methane etc. are not soluble
in water. It is because of the fact that these molecules don’t strongly
interact with the water molecules
13. Heavy water and uses:
Preparation of heavy water:
Heavy water is prepared either by prolonged electrolysis or by
fractional distillation of ordinary water.
Properties of Heavy Water:
Physical properties:
Heavy water is colourless, tasteless and odourless liquid.
It has all higher values for physical constants than the corresponding
values of ordinary water.
15. Chemical Properties of Heavy Water:
Although heavy water is chemically similar to ordinary water, chemical
reactions of heavy water are slower than those of ordinary water.
16. The following are the important uses of heavy
water:
As a neutron moderator: Heavy water is extensively used as a moderator in
nuclear reactions since it slows down the fast moving neutrons and thus
helps in controlling the nuclear reactions.
For the preparation of deuterium:
Heavy water produces deuterium on electrolysis or by its decomposition
with metals.
As a tracer compound:
Heavy water is used as a tracer compound for studying various reaction
mechanisms. For example. When hypophosporus acid (H3PO2) is treated with
D2O, only one H-atom is found to exchange with deuterium. This suggests
that H3PO2 has only one ionisable H-atom.