Name: how intermolecular forces affect matter
Uploaded: 2025-05-22T09:05:33.000Z
Duration: 2 min 56 s
Channel: JoVE

K12 Standards

Louisiana Student Standards for Science

High School

Chemistry

Matter And Its Interactions

HS-PS1-3

intermolecular-forces-and-physical-properties

Intermolecular Forces and Physical Properties

Moleküller arasında var olan elektrostatik etkileşimlere moleküller arası kuvvetler denir. Bu çekici kuvvetler, erime noktası, kaynama noktası ve çözünürlük gibi çeşitli fiziksel özellikleri etkiler.
Moleküller arası kuvvetlerin üç ana türü, iyonlar ve polar moleküller arasındaki güçlü iyon-dipol etkileşimlerini, polar moleküller arasındaki dipol-dipol etkileşimlerini ve son olarak, polar ve polar olmayan tüm moleküllerde bulunan en zayıf - dispersiyon kuvvetlerini içerir.
İyon-dipol etkileşimleri çözeltilerde ortaktır. Sodyum klorür gibi iyonik bir bileşik, su gibi polar bir çözücü içinde çözündüğünde, iyonlar su moleküllerinin zıt yüklü uçlarıyla hizalanarak maksimum elektrostatik çekime izin verir.
Alternatif olarak, dipol-dipol etkileşimleri, bir molekülün pozitif ucunun komşu molekülün negatif ucu ile elektrostatik olarak etkileşime girdiği kalıcı dipollü polar moleküller tarafından sergilenir.
Oksijen, nitrojen veya florine bağlı bir hidrojen atomu, komşu bir molekülün elektronegatif atomuna çekildiğinde, bir hidrojen bağı - özel bir dipol-dipol etkileşimi türü - oluşur. Özellikle, hidrojen bağı yapabilen bileşikler, yüksek erime ve kaynama noktaları sergiler.
Dispersiyon kuvvetleri geçici dipollerin bir sonucudur ve molar kütle ile artma eğilimindedir. Daha yüksek kütleli atomlar daha fazla elektrona ve daha büyük elektron bulutlarına sahiptir, bu da dağılma kuvvetlerinin artmasına neden olur. Sonuç olarak, komşu atomlar arasındaki çekici kuvvetlerin üstesinden gelmek için daha fazla enerji gerekir, bu da daha yüksek kaynama ve erime noktalarına neden olur.
Bu, alkan kaynama noktalarının neden molar kütleleri ile arttığını açıklar.
Bununla birlikte, molar kütle tek kriter değildir. Aynı kütlelere sahip olmasına rağmen, n-pentan, dispersiyon kuvvetleri için mevcut olan artan yüzey alanı nedeniyle neopentandan daha yüksek bir kaynama noktasına sahiptir.
Çözünürlüğün belirlenmesinde moleküller arası kuvvetler de çok önemlidir. Su ve etanol gibi benzer tür ve büyüklükte moleküller arası kuvvetlere sahip sıvılar, tüm oranlarda tamamen çözünür veya karışabilir.
Buna karşılık, farklı tür ve büyüklüklerde moleküller arası kuvvetlere sahip hekzan ve su gibi sıvılar çoğu oranda çözünmez veya karışmaz.
Genel olarak, moleküller arası kuvvetler nispeten zayıftır çünkü küçük veya kısmi yükler büyük mesafelerde etkileşime girer.

moleküller arası kuvvetler ve fiziksel Özellikler

<div>
 Moleküller arası kuvvetler, moleküller arasında bulunan çekici kuvvetlerdir. Maddelerin erime noktaları, kaynama noktaları ve çözünürlükleri (karışabilirlikleri) gibi çeşitli toplu özellikleri belirlerler. Örneğin, su gibi yüksek kaynama noktalı bir sıvı ((H2, kaynama noktası 100 °C), hekzan (C6H14, kaynama noktası 68,73 °C) gibi düşük kaynama noktalı bir sıvıyla karşılaştırıldığında daha güçlü moleküller arası kuvvetler sergiler. Üç tür moleküller arası etkileşim, i) iyon-dipol kuvvetlerini, ii) dipol-dipol etkileşimlerini ve iii) London dağılım kuvvetlerini içeren Van der Waals kuvvetlerini içerir.
 
 <ol style="display: flex; flex-direction: column; gap: 10px;">
 <li>İyon-Dipol Kuvvetleri
 İyon-dipol kuvvetleri, bir iyon ve bir dipol arasındaki elektrostatik çekimlerdir. Çözeltilerde yaygındırlar ve KCl gibi iyonik bileşiklerin suda çözünmesinde önemli bir rol oynarlar. İyon-dipol etkileşimlerinin gücü, i) iyonun yüküyle ve ii) polar moleküllerin dipolünün büyüklüğüyle doğru orantılıdır.
 
 </li>
 <li>Dipol-Dipol Etkileşimleri
 Polar moleküllerin bir ucunda kısmi pozitif yük, diğer ucunda ise kısmi negatif yük bulunur; bu yük ayrımına dipol adı verilir. İki kalıcı dipol arasındaki çekim kuvvetine dipol-dipol çekimi adı verilir; bu, bir polar molekülün kısmen pozitif ucu ile diğerinin kısmen negatif ucu arasındaki elektrostatik kuvvettir. Hidrojen bağı, O, N veya F gibi yüksek derecede elektronegatif bir atoma bağlı hidrojen ile moleküller arasındaki bir tür dipol-dipol etkileşimidir. Bir molekülde (hidrojen bağı donörü) ortaya çıkan kısmen pozitif yüklü H atomu, güçlü bir şekilde etkileşime girebilir. Bitişik moleküller (hidrojen bağı alıcısı) üzerinde kısmen negatif yüklü bir O, N veya F atomunun yalnız bir elektron çifti ile Hidrojen bağı kaynama noktasını önemli ölçüde artırır.
 
 </li>
 <li>
 Van der Waals ve London Dağılım Kuvvetleri
 Tüm kuvvetlerin en zayıfı, atomlar ve moleküller arasındaki moleküller arası mesafelere bağlı olan Van der Waals kuvvetleridir. Van der Waals kuvvetlerinin bir alt kümesi olan London dağılım kuvvetleri, elektron dağılımındaki geçici, kendiliğinden kaymalar nedeniyle yüksüz atomlar/moleküller arasındaki etkileşimlerin bir sonucu olarak deneyimlenir. Bu kuvvetlerin kuvvetinin, yüzey alanındaki artışa bağlı olarak molekül ağırlığının artmasıyla birlikte arttığı görülmektedir. Sonuç olarak, daha yüksek moleküler ağırlığa sahip bileşikler genellikle daha yüksek sıcaklıklarda kaynar. Dallanmış bir hidrokarbonun (neopentan) normalde ilgili düz zincirli (n-pentan) izomerinden daha küçük bir yüzey alanına ve dolayısıyla daha düşük bir kaynama noktasına sahip olması dikkat çekicidir.
 
 </li>
 <li>
 Organik Bileşiklerin Sudaki Çözünürlüğü
 Herhangi bir oranda homojen olarak karıştırılabilen sıvılara karışabilir sıvılar denir. Karışabilen sıvılar benzer polaritelere sahiptir. Örneğin metanol ve suyun her ikisi de polardır ve hidrojen bağı yapma kapasitesine sahiptir. Karıştırıldığında, metanol ve su, metanol-metanol ve su-su etkileşimleriyle karşılaştırılabilir kuvvete sahip moleküller arası hidrojen bağları yoluyla etkileşime girer; dolayısıyla karışabilirler. Benzer şekilde, hekzan ve brom gibi polar olmayan sıvılar da dağılma kuvvetleri yoluyla birbirleriyle karışabilir. "Benzer benzeri çözer" kimyasal aksiyomu, bileşiklerin karışabilirliğini tahmin etmek için kullanışlıdır. Kayda değer ölçüde karışmayan iki sıvıya karışmaz sıvılar denir. Örneğin, polar olmayan hekzan kutupsal su ile karışmaz. Hekzan ve su arasındaki nispeten zayıf çekim kuvvetleri, su molekülleri arasındaki daha güçlü hidrojen bağlama kuvvetlerini yeterince yenemez.
 
 </li>
 </ol>
 Bu metin ABC’den uyarlanmıştır.<a href="https://openstax.org/books/chemistry-2e/pages/10-1-intermolecular-forces"> Openstax, Chemistry 2e, Section 10.1: Intermolecular Forces</a>, <a href="https://openstax.org/books/chemistry-2e/pages/11-3-solubility">Section 11.3: Solubility</a>, and <a href="https://openstax.org/books/chemistry-2e/pages/10-introduction">Chapter 10: Liquids and Solids</a>.

</div>

Moleküller Arası Kuvvetler ve Fiziksel Özellikler


Moleküller arası kuvvetler, moleküller arasında var olan çekici kuvvetlerdir. Erime noktaları, kaynama noktaları gibi çeşitli toplu özellikleri belirlerler ...

Education

JoVE Core

Organic Chemistry

Organik Kimya

Unit 1

Ünite 1

Covalent Bonding and Structure

Kovalent Bağlanma ve Yapı

KEY TERMS AND CONCEPTS

TEMEL TERİMLER VE KAVRAMLAR

how intermolecular forces affect matter

Intermolecular forces are the attractions between molecules, and they help explain how matter behaves. These forces influence melting points, boiling points, and whether substances mix with one another. Water has a much higher boiling point than hexane, which shows that water has stronger intermolecular forces.

Three main kinds of intermolecular interactions are covered here. They include ion-dipole forces, dipole-dipole interactions, and van der Waals forces, which include London dispersion forces. Each type depends on how charges are arranged in or between molecules.

Ion-dipole forces are electrostatic attractions between an ion and a dipole. They are common in solutions and are important when ionic compounds such as KCl dissolve in water. Their strength depends on the charge on the ion and the size of the dipole in the polar molecule.

Dipole-dipole interactions happen between polar molecules. A polar molecule has a partial positive end and a partial negative end, which is called a dipole. Hydrogen bonding is a strong type of dipole-dipole interaction that occurs when hydrogen is bonded to O, N, or F, and it can raise boiling points a great deal.

Van der Waals forces are the weakest intermolecular forces discussed here. London dispersion forces are a type of van der Waals force and arise from temporary shifts in electron distribution in uncharged atoms or molecules. These forces usually get stronger as molecular weight increases because surface area increases, so compounds with higher molecular weights tend to boil at higher temperatures. A branched hydrocarbon such as neopentane has less surface area than straight-chain n-pentane, so neopentane has the lower boiling point.

Intermolecular forces also help predict solubility in water. Liquids that mix in any proportion are called miscible, and they usually have similar polarities. Methanol and water are miscible because both are polar and can form hydrogen bonds. Nonpolar hexane and bromine are also miscible with each other through dispersion forces. The idea of “like dissolves like” helps explain why this happens. Hexane and water are immiscible because the weak attraction between them does not overcome the stronger hydrogen bonding among water molecules.

How Intermolecular Forces Affect Matter

what is organic chemistry?

Carbon Compounds in Everyday Life

Organic chemistry focuses on carbon compounds called organic compounds. These compounds may come from living things or be made by chemists. Carbon is the main element in them, and it bonds with other carbon atoms as well as hydrogen, oxygen, nitrogen, and sulfur. Carbon can form up to four strong bonds. That ability lets carbon atoms build chains and rings of many sizes, shapes, and levels of complexity. Not every carbon-containing substance is classified as organic. Carbonates, cyanides, and...

electronic structure of atoms

Atomic Orbitals and Quantum Numbers

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chemical bonds

Chemical Bonds: Types and Strength

Chemical bonds help atoms reach a full valence shell like the nearest noble gas. The main bond types are ionic, covalent, and metallic. Bond energy and bond length also help explain how strong a bond is. An ionic bond forms from electrostatic attraction between cations and anions. In many cases, one atom transfers electrons to another atom, and the ions form from that transfer. Ionic bonds have no defined direction because the attraction spreads evenly through three-dimensional space. A...

polar covalent bonds

Electronegativity in Polar Covalent Bonds

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Molecular shape and molecular polarity can be predicted with VSEPR theory and dipole moments. Start by writing the Lewis structure of the molecule or polyatomic ion. Then count the electron groups around the central atom. Lone pairs and bonds both count as electron groups, and a single, double, or triple bond each counts as one region of electron density. Use that count to identify the electron-pair geometry. Next, use the number of lone pairs to determine the molecular structure. If more than...

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valence-bond-theory-and-hybridized-orbitals

Covalent Bond Overlap and Orbital Hybridization

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mo theory and covalent bonding

Bond Order and Molecular Orbitals

Molecular orbital theory explains how electrons are arranged in molecules. It treats electron regions in a molecule much like atomic orbitals in an atom. A molecular orbital is the region of space where a valence electron is most likely to be found. Molecular orbitals form through the linear combination of atomic orbitals, or LCAO. When atomic wave functions combine in phase, they create regions with high electron density. When they combine out of phase, they create nodes, or regions with no...

intermolecular forces and physical properties

Intermolecular forces are the attractions between molecules, and they help explain how matter behaves. These forces influence melting points, boiling points, and whether substances mix with one another. Water has a much higher boiling point than hexane, which shows that water has stronger intermolecular forces. Three main kinds of intermolecular interactions are covered here. They include ion-dipole forces, dipole-dipole interactions, and van der Waals forces, which include London dispersion...

solubility

Why Some Substances Dissolve in Water

Solution formation depends on how solutes and solvents interact. A solution is a homogeneous mixture made of a solvent, which is the larger part, and a solute, which is the smaller part. The physical state of a solution is usually the same as the solvent. Concentration is often described as dilute for a low amount of solute or concentrated for a high amount of solute. When a solute dissolves, its particles are surrounded by solvent species. This process is called solvation. If water is the...

introduction to functional groups

Functional Groups and Organic Molecules

Functional groups are groups of atoms with specific chemical properties that appear within organic molecules. They are sometimes shown as "R." These groups sit along the carbon backbone of macromolecules, which can form chains or rings of carbon atoms. Functional groups help functionalize a compound. That means they can give the molecule different physical and chemical properties. In organic chemistry, this change in group structure can strongly affect how a compound behaves. Common...

overview of advanced functional groups

Advanced Functional Groups in Organic Chemistry

Advanced functional groups are atom clusters in organic molecules that give those molecules specific chemical properties. They are sometimes shown as "R" in formulas. By changing the atoms attached to a carbon skeleton, a functional group can make a compound behave differently in physical and chemical reactions. This topic covers several major classes of organic compounds with advanced functional groups. Aromatic hydrocarbons include benzene. Phenol is another example and is also called...

key terms and concepts

Learn how ion-dipole, dipole-dipole, and London dispersion forces affect boiling point, melting point, and solubility in water and other liquids.

How Intermolecular Forces Affect Matter | JoVE K12

organic chemistry

JoVE Core Organik Kimya, kısa ve anlaşılması kolay animasyonlu video dersleri kullanarak stereokimya, reaksiyonlar ve mekanizmaların temel kavramlarını açıklar. Buna ek olarak, bilim insanlarının yer aldığı videolar, ilgili kavramların günümüz laboratuvarlarında gerçekleştirilen klasik ve orijinal araştırma deneylerinde nasıl uygulandığını göstermektedir.

motion-and-stability-forces-and-interactions

Motion And Stability: Forces And Interactions

HS-PS2-6

Tennessee Academic Standards

Motion and Stability: Forces and Interactions

CHEM1.PS2.2

Minnesota Academic Standards in Science

9-12

1.1.1 9L.4.2.1.1

Arizona Science Standards

Physical Science

HS+C.P1

HS+C.P1U1.4

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 ...

the-periodic-table-and-organismal-elements

The Periodic Table And Organismal Elements

Atomic Structure

The Greek philosopher Democritus proposed that everything on Earth is made up of tiny particles called atomos, Greek for &#34;indivisible,&#34; from which ...

Electron Configurations

Electron configurations and orbital diagrams can be determined by applying the Aufbau principle (each added electron occupies the subshell of lowest ...

Electronic Structure of Atoms


An atom comprises protons and neutrons, which are contained inside the dense, central&#160;core called the nucleus, with electrons present around the ...

electron-configuration-of-multielectron-atoms

Electron Configuration of Multielectron Atoms

The alkali metal sodium (atomic number 11) has one more electron than the neon atom. This electron must go into the lowest-energy subshell available, the ...

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 ...

The Aufbau Principle and Hund's Rule

To determine the electron configuration for any particular atom, we can build the structures in the order of atomic numbers. Beginning with hydrogen, and ...

Coulomb's Law

Experiments with electric charges have shown that if two objects each have an electric charge, they exert an electric force on each other. The magnitude ...

Electric Charges

From lightning during thunderstorms to electronic devices, the phenomenon of electromagnetism is all around us. The electromagnetic force is one of the ...

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Sources and Properties of Electric Charge

All objects we see around us consist of atoms, which combine to form molecules. The lightest element in the universe is hydrogen, and a hydrogen atom ...

Types of Forces

In most situations, forces can be grouped into two categories: contact forces and field forces.&#160; Contact forces occur as a result of direct physical ...

Electric Fields

Source: Yong P. Chen, PhD, Department of Physics &#38; Astronomy, College of Science, Purdue University, West Lafayette, IN
An electric field is generated ...

Intermolecular Forces

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

Van der Waals Interactions

Atoms and molecules interact with each other through intermolecular forces. These electrostatic forces arise from attractive or repulsive interactions ...

Chemical Bonds


Atoms participate in a chemical bond formation&#160;to acquire a completed valence-shell electron configuration similar to that of the noble gas nearest ...

Electron Behavior

Electrons are negatively charged subatomic particles attracted to and orbit around the positively-charged nucleus of an atom. They reside in spaces ...

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 ...

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 the periodic table as a model to predict the relative properties of elements based on the patterns of electrons in the outermost energy level and the composition of the nucleus of atoms.  Clarification Statement: Chemistry: Examples of properties that could be predicted from patterns could include reactivity of metals, types of bonds formed, numbers of bonds formed, atomic radius, atomic mass, or reactions with oxygen. Emphasis is on main group elements and qualitative understanding of the relative trends of ionization energy and electronegativity.

HS-PS1-1

Properties of Transition Metals

Transition metals are defined as those elements that have partially filled d orbitals. As shown in Figure 1, the d-block elements in groups 3&#8211;12 are ...

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 ...

Chemical Reactions

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Chemical Equations

Chemical equations represent the identities and relative quantities of substances involved in a chemical reaction. The substances undergoing reaction are ...

Introduction to Chemical Reactions

All chemical reactions begin with a reactant, the general term for one or more substances entering the reaction. Sodium and chloride ions, for example, ...

Temperature Dependence on Reaction Rate

The Collision Theory
Atoms, molecules, or ions must collide before they can react with each other. Atoms must be close together to form chemical bonds. ...

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Stoichiometry, Product Yield, and Limiting Reactants

Source: Smaa Koraym at Johns Hopkins University, MD, USA

	Preparation of 25% v/v Ethylenediamine in Deionized WaterExpand
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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 ...

Dynamic Equilibrium

A reversible chemical reaction represents a chemical process that proceeds in both forward (left to right) and reverse (right to left) directions. When ...

Construct and revise an explanation for the outcome of a simple chemical reaction based on the outermost electron states of atoms, trends in the periodic table, and knowledge of the patterns of chemical properties.  Clarification Statement: Chemistry: Examples of chemical reactions could include the reaction of sodium and chlorine, carbon and oxygen, or carbon and hydrogen. Reaction classification aids in the prediction of products (e.g. synthesis, decomposition, single displacement, double displacement, and acid-base).

HS-PS1-2

Intermolecular vs Intramolecular Forces

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

comparison-between-electrical-and-gravitational-forces

Comparison Between Electrical And Gravitational Forces

There are four fundamental forces in nature: the gravitational force, the electromagnetic force, the strong nuclear force, and the weak nuclear force. To ...



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

electric-field-of-two-equal-and-opposite-charges

Electric Field of Two Equal and Opposite Charges

Atoms generally contain the same number of positively and negatively charged particles, protons, and electrons. Hence, they are electrically neutral. ...

Electric Field

Consider two point charges, each exerting Coulomb force on the other. It is possible to describe the Coulomb interaction via an intermediate step by ...

Ionic Bonding and Electron Transfer

Ions are atoms or molecules bearing an electrical charge. A cation (a positive ion) forms when a neutral atom loses one or more electrons from its valence ...

Electric Dipoles and Dipole Moment

Consider two charges of equal magnitude but opposite signs. If they cannot be separated by an external electric field, the system is called a permanent ...

Plan and conduct an investigation to gather evidence to compare the structure of substances at the macroscale to infer the strength of electrical forces between particles.  Clarification Statement: Emphasis is on understanding the strengths of forces between particles, not on naming specific intermolecular forces (such as dipole-dipole). Examples of particles could include ions, atoms, molecules, and network solids (such as graphite). Examples of macro-properties of substances could include the melting point and boiling point, vapor pressure, and surface tension.

bond-dissociation-energy-and-activation-energy

Bond Dissociation Energy and Activation Energy

Bond energy is the energy required to break a bond homolytically. These values are usually expressed in units of kcal/mol or kJ/mol and are referred to as ...

Bond Energies and Bond Lengths

Stable molecules exist because covalent bonds hold the atoms together. The strength of a covalent bond is measured by the energy required to break it, ...

Coupled Reactions

Cellular processes such as building and breaking down complex molecules occur through stepwise chemical reactions. Some of these chemical reactions are ...

energy-diagrams-transition-states-and-intermediates

Energy Diagrams, Transition States, and Intermediates

Free-energy diagrams, or reaction coordinate diagrams, are graphs showing the energy changes that occur during a chemical reaction. The reaction ...

What is Metabolism?

Overview

Metabolism represents all of the chemical activity in a cell, including reactions that build molecules (anabolism) and those that break ...

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Types of Chemical Reactions: Anabolic and Catabolic

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Non-equilibrium in the Cell

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Activation Energy

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Energy Transfer in Chemical Reactions

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Factors Influencing the Rate of Chemical Reactions

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Predicting Reaction Outcomes

Kinetics describes the rate and path by which a reaction occurs. In contrast, thermodynamics deals with state functions and describes the properties, ...

States of Matter and Phase Changes

The internal energy of a substance&#8212;the total kinetic energy of all its molecules and the potential energy of their associated forces&#8212;depends ...

Develop a model to illustrate that the release or absorption of energy from a chemical reaction system depends upon the changes in total bond energy.  Clarification Statement: Emphasis is on the idea that a chemical reaction is a system that affects the energy change.  Examples of models could include molecular-level drawings and diagrams of reactions, graphs showing the relative energies of reactants and products, and representations showing energy is conserved.

HS-PS1-4

How Intermolecular Forces Affect Matter

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