Name: how acids and bases form ions
Uploaded: 2020-09-03T13:38:26.000Z
Duration: 3 min 26 s
Channel: JoVE

K12 Standards

north-carolina-k-12-science-standard-course-of-study

North Carolina K-12 Science Standard Course of Study

9-12

Physical Science

Matter and its Interactions

PS.PSc.2.4

Acids, Bases and Neutralization Reactions

De menselijke maag is een gespierd orgaan dat maagsappen bevat, waaronder zoutzuur, dat helpt bij het verteren van voedsel. Bepaalde soorten voedsel verhogen de zuurgraad van onze maag en veroorzaken zuur reflux. Het nuttigen van alkalisch voedsel, of een base zoals een antacidum, neutraliseert het overtollige zuur en verlicht het branderige gevoel.Dit is een voorbeeld van een zuur-basereactie. De eenvoudigste zuren zijn stoffen die dissocieerbare waterstofatomen bevatten. In waterige oplossingen geven ze positief geladen waterstofionen of protonen af, samen met de overeenkomstige anionen.De protonen reageren met watermoleculen om hydroniumionen te vormen. Een waterige oplossing van salpeterzuur bevat bijvoorbeeld waterstofionen en nitraationen. Andere algemeen bekende zuren zijn zoutzuur, zwavelzuur en fosforzuur.Zuren zijn monoprotisch of polyprotisch, afhankelijk van het aantal dissocieerbare waterstof-atomen per molecuul. Zoutzuur en salpeterzuur, met elk één dissocieerbare waterstof, zijn beide voorbeelden van monoprotische zuren, terwijl zwavelzuur en fosforzuur polyprotisch zijn. Zwavelzuur is diprotisch en geeft zijn twee protonen achtereenvolgens vrij, terwijl fosforzuur triprotisch is en achtereenvolgens uiteenvalt in drie stappen.De eenvoudigste basen zijn verbindingen die negatief geladen hydroxide-ionen opleveren in waterige oplossingen. Gemakkelijk identificeerbare basen bevatten hydroxylgroepen;bijvoorbeeld natriumhydroxide, kaliumhydroxide en calciumhydroxide. Dergelijke basen dissociëren, wanneer ze aan water worden toegevoegd, in hydroxide-ionen en de overeenkomstige metaalkationen.Niet-hydroxide-basen zoals ammoniak reageren met water door protonen van watermoleculen te accepteren om ammoniumionen en hydroxide-ionen te produceren. Over het algemeen reageren een zuur en een base om water en een zout te vormen. Zuur-basereacties worden ook wel neutralisatiereacties genoemd als het aantal mol protonen dat door het zuur wordt geleverd en het aantal mol hydroxide-ionen dat door de base wordt geleverd, gelijk zijn.Wanneer bijvoorbeeld gelijke hoeveelheden waterig salpeterzuur en waterig kaliumhydroxide worden gemengd, zijn de hoeveelheden hydronium-en hydroxide-ionen die aan de oplossing worden toegevoerd eveneens gelijk. De hydronium-en hydroxide-ionen neutraliseren elkaar daarom volledig door te combineren om water te vormen, waarbij geen hydronium-of hydroxide-ionen achterblijven. Bovendien vormen de nitraatanionen en kaliumkationen een paar om een zout te vormen kaliumnitraat.Bepaalde neutralisatiereacties zijn gasontwikkelingsreacties. Zoutzuur en kaliumsulfiet reageren bijvoorbeeld om kaliumchloride, water en zwaveldioxidegas te vormen via het sulfide-bisulfide-evenwichtssysteem.

zuren, basen en neutralisatiereacties

Een zuur-basereactie is een reactie waarbij een waterstofion, H+, wordt overgedragen van de ene chemische soort naar de andere. Dergelijke reacties zijn van cruciaal belang voor talrijke natuurlijke en technologische processen, variërend van de chemische transformaties in cellen of meren en oceanen tot de productie op industriële schaal van kunstmest, farmaceutische producten en andere stoffen die essentieel zijn voor de samenleving. Er zijn verschillende manieren om een zuur te definiëren. In de context van waterige oplossingen is een zuur een stof die oplost en waterstofionen produceert. <img alt="Eq1" src="https://www.jove.com/files/core/CDNSource/lessons/1029/1029_Equations-01.png" style="height: 40px;"> Dit is de Arrhenius-definitie van een zuur, genoemd naar de Zweedse chemicus Svante Arrhenius (1859–1927). Een waterstofion, weergegeven door het symbool H+, wordt een proton genoemd. In oplossing combineren de protonen zich chemisch met watermoleculen, via de eenzame paren op zuurstof, om hydroniumionen te vormen, H3O+. <img alt="Eq2" src="https://www.jove.com/files/core/CDNSource/lessons/1029/1029_Equations-02.png" style="height: 40px;"> De chemische vergelijking voor de ionisatie van een zuur wordt geschreven als <img alt="Eq3" src="https://www.jove.com/files/core/CDNSource/lessons/1029/1029_Equations-03.png" style="height: 40px;"> Zuren die op deze manier volledig met water reageren, worden sterke zuren genoemd. HCl, HNO3 en HBr zijn enkele voorbeelden. De meeste zuren die je in het dagelijks leven tegenkomt, zijn zwakke zuren. Het citroenzuur in fruit, azijnzuur in azijn en melkzuur in melk zijn enkele voorbeelden. Een bekend voorbeeld van een zwak zuur is azijnzuur, het hoofdingrediënt in voedselazijn. Wanneer opgelost in water onder typische omstandigheden, is slechts ongeveer 1% van de azijnzuurmoleculen aanwezig in de geïoniseerde vorm, CH3CO2−. <img alt="Eq4" src="https://www.jove.com/files/core/CDNSource/lessons/1029/1029_Equations-04.png" style="height: 40px;"> Het gebruik van een dubbele pijl in de bovenstaande vergelijking geeft het gedeeltelijke reactieaspect van dit proces aan. Een base is een stof die in water oplost en hydroxide-ionen oplevert, OH−. De meest voorkomende basen zijn ionische verbindingen die zijn samengesteld uit alkali- of aardalkalimetaalkationen (groepen 1 en 2) gecombineerd met het hydroxide-ion, bijvoorbeeld NaOH en Ca(OH)2. In tegenstelling tot de eerder besproken zuurverbindingen reageren deze verbindingen niet chemisch met water; in plaats daarvan lossen ze op en dissociëren ze, waardoor hydroxide-ionen direct in de oplossing vrijkomen. KOH en Ba(OH)2 lossen bijvoorbeeld op in water en dissociëren volledig om kationen (respectievelijk K+ en Ba2+) en hydroxide-ionen, OH−, te produceren. Deze basen worden, samen met andere hydroxiden die volledig dissociëren in water, als sterke basen beschouwd. Beschouw als voorbeeld het oplossen van natriumhydroxide in water: <img alt="Eq5" src="https://www.jove.com/files/core/CDNSource/lessons/1029/1029_Equations-05.png" style="height: 40px;"> Deze vergelijking bevestigt dat natriumhydroxide een base is. Wanneer opgelost in water dissocieert NaOH en levert Na+ en OH− ionen op. Dit geldt ook voor elke andere ionische verbinding die hydroxide-ionen bevat. Omdat het dissociatieproces in wezen voltooid is wanneer ionische verbindingen onder typische omstandigheden in water oplossen, worden NaOH en andere ionische hydroxiden allemaal geclassificeerd als sterke basen. In tegenstelling tot ionische hydroxiden produceren sommige verbindingen hydroxide-ionen wanneer ze worden opgelost door chemisch te reageren met watermoleculen. In alle gevallen reageren deze verbindingen slechts gedeeltelijk en worden daarom geclassificeerd als zwakke basen. Dit soort verbindingen zijn ook overvloedig aanwezig in de natuur en zijn belangrijke grondstoffen in verschillende technologieën. De mondiale productie van de zwakke base ammoniak bedraagt bijvoorbeeld doorgaans ruim 100 ton per jaar, omdat het op grote schaal wordt gebruikt als landbouwmeststof, als grondstof voor de chemische synthese van andere verbindingen en als actief ingrediënt in huishoudelijke schoonmaakmiddelen. Wanneer opgelost in water, reageert ammoniak gedeeltelijk en levert hydroxide-ionen op, zoals hier weergegeven: <img alt="Eq6" src="https://www.jove.com/files/core/CDNSource/lessons/1029/1029_Equations-06.png" style="height: 40px;"> Dit is per definitie een zuur-base-reactie waarbij H+-ionen van watermoleculen naar ammoniakmoleculen worden overgedragen. Onder typische omstandigheden is slechts ongeveer 1% van de opgeloste ammoniak aanwezig als NH4+ ionen. Een neutralisatiereactie is een specifiek type zuur-base-reactie waarbij de reactanten een zuur en een base zijn (maar geen water), en de producten vaak zout en water zijn: <img alt="Eq7" src="https://www.jove.com/files/core/CDNSource/lessons/1029/1029_Equations-07.png" style="height: 40px;"> Om een neutralisatiereactie te illustreren, bedenk eens wat er gebeurt als een typisch maagzuurremmer zoals magnesiummelk (een waterige suspensie van vast Mg(OH)2) wordt ingenomen om de symptomen te verlichten die gepaard gaan met overmatig maagzuur (HCl): <img alt="Eq8" src="https://www.jove.com/files/core/CDNSource/lessons/1029/1029_Equations-08.png" style="height: 40px;"> Merk op dat deze reactie, naast water, een zout produceert, magnesiumchloride. De H+ (aq) van het zuur (sterk of zwak) combineert met de OH− (aq) van de base (of geproduceerd door de reactie van een zwakke base met water) om H2O (l) te vormen. De reactie tussen waterige oplossingen van HCl (sterk zuur) en NaOH (sterke base) wordt bijvoorbeeld als volgt geschreven: <img alt="Eq9" src="https://www.jove.com/files/core/CDNSource/lessons/1029/1029_Equations-09.png" style="height: 40px;"> Zowel HCl als NaOH ondergaan 100% ionisatie. De volledige ionische vergelijking kan daarom worden geschreven als: <img alt="Eq10" src="https://www.jove.com/files/core/CDNSource/lessons/1029/1029_Equations-10.png" style="height: 40px;"> Cl- en Na+ worden de toeschouwerionen genoemd, die elkaar opheffen, wat de netto-ionische vergelijking oplevert als: <img alt="Eq11" src="https://www.jove.com/files/core/CDNSource/lessons/1029/1029_Equations-11.png" style="height: 40px;">

Zuren, basen en neutralisatiereacties

An acid-base reaction is one in which a hydrogen ion, H+, is transferred from one chemical species to another. Such reactions are of central importance to ...

Education

Book

Chemistry

Scheikunde

Chemical Quantities and Aqueous Reactions

Chemische hoeveelheden en waterige reacties

chemical-quantities-and-aqueous-reactions

how acids and bases form ions

Acids and bases form ions in water through acid-base reactions. These reactions move a hydrogen ion, H+, from one chemical species to another. They matter in many natural and technological processes, from chemistry inside cells and in lakes and oceans to the large-scale production of fertilizers, pharmaceuticals, and other useful substances.

In water, an acid is a substance that produces hydrogen ions. This is the Arrhenius definition of an acid. The H+ ion is also called a proton. In solution, these protons combine with water molecules to form hydronium ions, H3O+.

Acids that react completely with water are called strong acids. Common examples include HCl, HNO3, and HBr. Most acids people encounter in daily life are weak acids. Citric acid in fruits, acetic acid in vinegar, and lactic acid in milk are examples. Acetic acid is a familiar weak acid, and under typical conditions only about 1% of its molecules are in the ionized form, CH3CO2−. A double arrow shows that this reaction is only partial.

A base is a substance that dissolves in water to yield hydroxide ions, OH−. The most common bases are ionic compounds made of alkali or alkaline earth metal cations from groups 1 and 2 with hydroxide ions, such as NaOH and Ca(OH)2. These compounds do not react chemically with water. Instead, they dissolve and dissociate, releasing hydroxide ions directly into solution.

KOH and Ba(OH)2 are examples of strong bases because they dissociate completely in water. The same is true for sodium hydroxide. When NaOH dissolves, it gives Na+ and OH− ions. Any ionic compound that contains hydroxide ions behaves this way under typical conditions, so these hydroxides are classified as strong bases.

Some compounds make hydroxide ions by reacting with water molecules instead of simply dissociating. These compounds react only partially, so they are weak bases. Ammonia is a common example. It is produced on a very large scale because it is used as an agricultural fertilizer, a starting material for chemical synthesis, and an ingredient in household cleaners. When ammonia dissolves in water, it reacts partially to form OH− and NH4+ ions. This is an acid-base reaction because H+ ions move from water molecules to ammonia molecules. Under typical conditions, only about 1% of dissolved ammonia is present as NH4+.

A neutralization reaction is a special acid-base reaction in which an acid and a base react, but water is not a reactant. The products are often a salt and water. Milk of magnesia is a common antacid made of solid Mg(OH)2 in water. It helps relieve excess stomach acid, HCl, by neutralizing it. This reaction forms water and the salt magnesium chloride.

In neutralization, H+(aq) from the acid combines with OH−(aq) from the base to make H2O(l). For example, HCl and NaOH are both completely ionized in water. Their complete ionic equation includes Na+ and Cl− ions, but these are spectator ions because they cancel out. The net ionic equation shows the essential change: H+(aq) + OH−(aq) → H2O(l).

How Acids and Bases Form Ions

precipitation reactions

Predicting Precipitation in Aqueous Reactions

Precipitation reactions happen when two aqueous solutions of soluble salts are mixed and an insoluble ionic compound forms. That solid is called a precipitate. The ions in solution exchange partners, so these reactions are also called double displacement, double replacement, exchange, or metathesis reactions. These reactions are useful in chemistry for identifying metal ions in a compound. They also support gravimetric methods, which measure composition by the mass of a substance. Whether a...

reaction stoichiometry

Using Balanced Equations to Predict Amounts

Balanced chemical equations show how much of each substance reacts and forms in a chemical change. The formulas identify the reactants and products, which helps classify the reaction. The coefficients show the relative numbers of each substance, which lets chemists measure the relationships between amounts consumed and produced. These quantitative relationships are called stoichiometry. The word comes from the Greek words stoicheion, meaning element, and metron, meaning measure. Stoichiometry...

acids, bases and neutralization reactions

Acids and bases form ions in water through acid-base reactions. These reactions move a hydrogen ion, H+, from one chemical species to another. They matter in many natural and technological processes, from chemistry inside cells and in lakes and oceans to the large-scale production of fertilizers, pharmaceuticals, and other useful substances. In water, an acid is a substance that produces hydrogen ions. This is the Arrhenius definition of an acid. The H+ ion is also called a proton. In...

limiting reactant

Limiting Reactant in Water Formation

Limiting reactants control how much product forms in a chemical reaction. In a balanced equation, the listed amounts of reactants and products are called stoichiometric amounts. In real reactions, the reactants are not always present in those exact proportions. The limiting reactant is the reactant that gets used up first. Once it is gone, the reaction stops making more product. The other reactant is called the excess reactant. Chemists often use extra amounts of one reactant to make sure the...

reaction yield

Calculating Percent Yield in Reactions

Percent yield shows how much product a chemical reaction actually makes compared with how much it should make. The expected amount is called the theoretical yield. It comes from the balanced chemical equation and the stoichiometry, or mole ratios, in that equation. The theoretical yield assumes that the limiting reactant is completely converted into the desired product. The product collected after a reaction is the actual yield. In many cases, the actual yield is lower than the theoretical...

general properties of solutions

Solvents, Solutes, and Solution Types

Solutions are common mixtures found in everyday life. Ocean water, air, and gasoline are all examples of solutions. These mixtures contain two or more types of atoms or molecules in varying amounts. A solution is a homogeneous mixture, which means its composition is uniform throughout. This is different from a heterogeneous mixture, which has a non-uniform composition. In a homogeneous mixture, the components are evenly spread out and thoroughly mixed. Every solution has a solvent and a...

solution concentration and dilution

Molarity and Dilution in Solutions

Molarity and dilution are key ideas for describing solution concentration. Concentration means the relative amount of one component in a solution. In many solutions, one component is present in much larger amount. That component is the solvent, which acts as the medium that holds the other parts dissolved or dispersed. Water is a very common solvent, so aqueous solutions are common on Earth. A solute is the component present at a much lower concentration than the solvent. Chemists often...

electrolyte and nonelectrolyte solutions

Conductivity in Electrolyte Solutions

Electrolyte solutions conduct electricity because they contain mobile ions. The amount of current depends on how many ions are present in the aqueous solution. A solution with more dissolved ions conducts better, while a solution with few or no ions conducts poorly. Strong electrolytes dissociate completely in water. This complete dissociation is shown with a single forward arrow. Water-soluble ionic compounds such as sodium chloride split into sodium cations and chloride anions in solution.

solubility of ionic compounds

Solubility Rules for Ionic Salts

Solubility rules help predict whether ionic salts will dissolve in water. Solubility is the maximum amount of solute that can dissolve in a given amount of solvent at a set temperature and pressure. It is often measured in molarity, or moles per liter (mol/L). A compound is soluble if it dissolves in water. When a soluble salt dissolves, its ions separate and spread evenly through the solution. This physical change is called dissociation. Potassium chloride, KCl, is a simple example. Water...

chemical reactions in aqueous solutions

Aqueous Reactions and Ionic Equations

Aqueous reactions are chemical reactions that take place in water. Water is a good solvent, so it can dissolve many substances. Because of that, many chemical reactions happen in aqueous solution. In high school chemistry, these reactions are often grouped into three common patterns: precipitation, acid-base, and oxidation-reduction. A precipitation reaction happens when ions in two aqueous ionic compounds exchange partners and form an insoluble salt, called a precipitate. In an acid-base...

oxidation–reduction reactions

Redox Reactions and Oxidation Numbers

Redox reactions are chemical changes in which electrons move between reactants, and oxidation numbers help track that change. The term oxidation once referred only to reactions with molecular oxygen, but it now covers a wider reaction class called oxidation-reduction, or redox, reactions. Some redox reactions form ionic products. A simple example is the reaction between sodium and chlorine that produces sodium chloride. To follow what happens to each reactant, chemists often write...

oxidation numbers

Assigning Oxidation States in Redox Reactions

Oxidation states help track electron transfer in redox reactions. An oxidation number, also called an oxidation state, is a hypothetical number that shows the effective charge of an atom or element. Chemists assign it by using a set of rules. In an ionic compound, oxidation numbers are based on how many electrons move between reacting species. For example, when calcium chloride forms, calcium loses two valence electrons and the two chlorine atoms each gain one electron. In CaCl2, calcium has...

acids, bases, and neutralization reactions

synthesis and decomposition reactions

Building and Breaking in Chemical Reactions

Synthesis and decomposition are two redox reactions that show how substances can be built up or broken down. Synthesis means to make something, while decomposition means to break something apart. These reactions also involve chemical changes and energy changes. Synthesis reactions are also called combination reactions. In a synthesis reaction, two or more substances join to form one more complex substance. They are often written as A + B → AB or A + B → C. One example is the formation of...

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chemical quantities and aqueous reactions

Learn how acids and bases form ions in water, including strong and weak acids, strong and weak bases, ammonia, and neutralization reactions.

How Acids and Bases Form Ions | JoVE K12

chemistry

PS.PSc.2.6

Texas Essential Knowledge and Skills

High School

Chemistry and Physics

IPC.8

IPC.8.A

Pennsylvania State Academic Standards

Chemical Reactions

3.2.9-12.C

3.2.9-12.G

Louisiana Student Standards for Science

Matter And Its Interactions

HS-PS1-2

HS-PS1-7

ohios-learning-standards-and-model-curriculum

Ohio’s Learning Standards and Model Curriculum

Interactions Of Matter

Chemical reactions

Tennessee Academic Standards

Matter and Its Interactions

CHEM1.PS1.4

Arizona Science Standards

HS+C.P1

HS+C.P1U1.5

CHEM.9

CHEM.9.B

Alabama Course of Study Science

9-12.PS.3.5.d

9-12.PS.3.6.d

Florida Department of Education

SC.912.P.8

SC.912.P.8.8

new-york-state-science-learning-standards

New York State Science Learning Standards

HS. Chemical Reactions

HS-PS1-4.

HS-PS1-12.

Georgia Standards of Excellence

SC6.

Neutralization Reactions

Classifying Matter by State

Chemistry is the study of matter and the changes it undergoes. Matter is anything that has mass and occupies space. Matter is all around us; the air, ...

Classifying Matter by Composition

Matter: Pure Substances and Mixtures
According to its composition, the matter can be classified into two broad categories &mdash; pure substances and ...

Elements: Chemical Symbols and Isotopes

A chemical symbol is an abbreviation used to indicate an element or an atom of an element. For example, the symbol for mercury is Hg. The same symbol is ...

Molecules and Compounds

Atoms and Molecules

Everything in the universe is made up of matter, and matter is composed of a combination of elements. An atom is the smallest unit of ...

Solution Formation

There is no one solvent that can dissolve every type of solute. Some substances that readily dissolve in a certain solvent might be insoluble in a ...

Colloids

Children at play often make suspensions such as mixtures of mud and water, flour and water, or a suspension of solid pigments in water known as tempera ...

Construct an explanation to classify matter as a pure substance or mixture; homogeneous or heterogeneous; element or compound; solution, colloid or suspension.

PS.PSc.1.1

Phase Transitions

Whether solid, liquid, or gas, a substance&#39;s state depends on the order and arrangement of its particles (atoms, molecules, or ions). Particles in the ...

phase-transitions-vaporization-and-condensation

Phase Transitions: Vaporization and Condensation

The physical form of a substance changes on changing its temperature. For example, raising the temperature of a liquid causes the liquid to vaporize ...

Vapor Pressure

When a liquid vaporizes in a closed container, gas molecules cannot escape. As these gas phase molecules move randomly about, they will occasionally ...

Clausius-Clapeyron Equation

The equilibrium between a liquid and its vapor depends on the temperature of the system; a rise in temperature causes a corresponding rise in the vapor ...

Phase Transitions: Melting and Freezing

Heating a crystalline solid increases the average energy of its atoms, molecules, or ions, and the solid gets hotter. At some point, the added energy ...

phase-transitions-sublimation-and-deposition

Phase Transitions: Sublimation and Deposition

Some solids can transition directly into the gaseous state, bypassing the liquid state, via a process known as sublimation. At room temperature and ...

Heating and Cooling Curves

When a substance&#8212;isolated from its environment&#8212;is subjected to heat changes, corresponding changes in temperature and phase of the substance ...

Phase Diagrams

A phase diagram combines plots of pressure versus temperature for the liquid-gas, solid-liquid, and solid-gas phase-transition equilibria of a substance. ...

Use models to compare the phases of matter and the physical changes they undergo.

PS.PSc.1.2

physical-and-chemical-properties-of-matter

Physical and Chemical Properties of Matter

The characteristics that enable us to distinguish one substance from another are called properties.

Physical Properties of Matter

A physical property is ...

molecular-comparison-of-gases-liquids-and-solids

Molecular Comparison of Gases, Liquids, and Solids

Particles in a solid are tightly packed together (fixed shape) and often arranged in a regular pattern; in a liquid, they are close together with no ...

Intermolecular vs Intramolecular Forces

Intermolecular forces (IMF) are electrostatic attractions arising from charge-charge interactions between molecules. The strength of the intermolecular ...

Intermolecular Forces

Atoms and molecules interact through bonds (or forces): intramolecular and intermolecular. The forces are electrostatic as they arise from interactions ...

comparing-intermolecular-forces-melting-point-boiling-point

Comparing Intermolecular Forces: Melting Point, Boiling Point, and Miscibility

Intermolecular forces are attractive forces that exist between molecules. They dictate several bulk properties, such as melting points, boiling points, ...

Carry out investigations to compare physical and chemical properties of matter.

PS.PSc.1.3

The Atomic Theory of Matter

The earliest recorded discussion of the basic structure of matter comes from ancient Greek philosophers. Leucippus and Democritus argued that all matter ...

Subatomic Particles

Dalton was only partially correct about the particles that make up matter. All matter is composed of atoms, and atoms are composed of three smaller ...

The Bohr Model

Following the work of Ernest Rutherford and his colleagues in the early twentieth century, the picture of atoms consisting of tiny dense nuclei surrounded ...

Emission Spectra

When solids, liquids, or condensed gases are heated sufficiently, they radiate some of the excess energy as light. Photons produced in this manner have a ...

The de Broglie Wavelength

In the macroscopic world, objects that are large enough to be seen by the naked eye follow the rules of classical physics. A billiard ball moving on a ...

The Uncertainty Principle

Werner Heisenberg considered the limits of how accurately one can measure properties of an electron or other microscopic particles. He determined that ...

Use models to interpret the data presented in Bohr diagrams and electron dot diagrams for neutral atoms of elements 1 through 18.

PS.PSc.1.4

Ions and Ionic Charges

In ordinary chemical reactions, the nucleus &mdash; which contains the protons and neutrons of each atom and thus identifies the element &mdash; remains ...

Use models to compare representations of atoms, ions, and isotopes.

PS.PSc.1.5

The Periodic Table

As early chemists discovered more elements, they realized that various elements could be grouped by their similar chemical behaviors. One such grouping ...

Periodic Classification of the Elements

The periodic table arranges atoms based on increasing atomic number so that elements with the same chemical properties recur periodically. When their ...

atomic-radii-and-effective-nuclear-charge

Atomic Radii and Effective Nuclear Charge

The elements in groups of the periodic table exhibit similar chemical behavior. This similarity occurs because the members of a group have the same number ...

Ionic Radii

Ionic radius is the measure used to describe the size of an ion. A cation always has fewer electrons and the same number of protons as the parent atom; it ...

Ionization Energy

The amount of energy required to remove the most loosely bound electron from a gaseous atom in its ground state is called its first ionization energy ...

Electron Affinity

The electron affinity (EA) is the energy change for adding an electron to a gaseous atom to form an anion (negative ion).



This process can be either ...

Alkali Metals

Group 1 elements are soft and shiny metallic solids. They are malleable, ductile, and good conductors of heat and electricity. The melting points of the ...

Halogens

Group 17 elements, known as halogens, are nonmetals. At room temperature, fluorine and chlorine are gases, bromine is a liquid, and iodine a solid. ...

Noble Gases


The elements in group 18 are noble gases (helium, neon, argon, krypton, xenon, and radon). They earned the name &ldquo;noble&rdquo; because they were ...

Use the Periodic Table as a model to predict the relative properties (metallic/nonmetallic character, ionic charge, and reactivity) and arrangement of elements based on the pattern of valence electrons in the outermost energy levels of atoms.

PS.PSc.1.6

Understand types, properties, and structure of matter.

How Acids and Bases Form Ions

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