4.1 Lecture 2008
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This document discusses compounds, mixtures, and chemical formulas and structures. It defines compounds as pure substances with chemically bonded elements and constant composition, while mixtures are combinations of pure substances where properties remain but ratios vary. It explains how to read chemical formulas including symbols, subscripts, and coefficients. Different models for depicting chemical structures like ball-and-stick, structural formulas, and space-filling are introduced. The effects of chemical structure like network, bonded ions, and molecular compounds on compound properties such as state, strength, and melting/boiling points are outlined.
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Chemunit7presentation 120104184804-phpapp02
The document discusses covalent bonding and molecular structure. It begins by explaining how atoms form stable electron configurations by sharing electrons through covalent bonds to form molecules. Rules for naming binary molecular compounds, binary acids, and oxyacids are also presented. The objectives include describing single, double, and triple covalent bonds; contrasting sigma and pi bonds; and relating bond strength to length and energy. Molecular shape is determined using the VSEPR model and hybridization of atomic orbitals is introduced.
Chapter 6.2 : Covalent Bonding and Molecular Compounds
Covalent bonding occurs when atoms share valence electrons to achieve stable electron configurations. Molecules are formed when atoms bond covalently, with molecular formulas indicating the types and numbers of atoms. Lewis structures represent molecules by showing bonding pairs and unshared electron pairs. Exceptions to the octet rule include hydrogen and boron. Resonance structures are used to depict molecules that cannot be represented by a single Lewis structure.
Chemistry
This document provides an overview of key concepts in earth/environmental science chemistry including:
- Matter is anything that has mass and takes up space. Density measures the ratio of mass to volume.
- Temperature is measured in Kelvin, Celsius, and Fahrenheit scales. States of matter include solids, liquids, gases, and plasma.
- Atoms are the basic units that make up elements. The nucleus contains protons and neutrons. Electrons surround the nucleus.
- The periodic table organizes elements and shows their properties. Elements bond through ionic or covalent bonds to form compounds.
2009 compounds2
The document defines key chemical terms like compounds, molecules, chemical formulas, and diatomic molecules. It explains that compounds are formed when two or more atoms chemically bond together, giving the example of sodium and chlorine forming salt. Chemical formulas use subscripts to indicate the number of atoms of each element in a molecule, while coefficients indicate the number of molecules. It notes that seven elements - hydrogen, nitrogen, oxygen, fluorine, chlorine, bromine and iodine - always exist as diatomic molecules with two atoms of the same element bonded together.
atomes, compounds and elements.pptx
There are three main states of matter: solids, liquids, and gases. Solids have a fixed shape and volume, and their particles cannot move around freely but vibrate in place. Liquids have a fixed volume but can flow and take the shape of their container. Gases have neither a fixed shape nor volume, and their particles move freely and are spread out. The properties that distinguish these three states are important to understand the structure and behavior of matter.
Hunter3mk
This document provides an overview of chemical formulas and molecular models. It discusses the different types of chemical formulas including empirical formulas, molecular formulas, and structural formulas. Empirical formulas show the simplest whole number ratio of elements in a compound while molecular formulas show the actual number of atoms. Structural formulas use lines to represent bonds between atoms in a molecule. Molecular models like ball-and-stick and space-filling models are also used to represent molecules. The document also discusses the classification of substances as atomic elements, molecular elements, ionic compounds, or molecular compounds. It provides examples of writing formulas for ionic compounds from their names.
2009 Compounds2
The document provides information about chemical compounds and formulas:
1. It defines a compound as two or more elements chemically joined together to form a new substance with different properties than the elements.
2. It explains that a molecule is the smallest piece of a compound that retains the compound's properties.
3. It describes how chemical formulas use subscripts to indicate the number of atoms of each element in a compound, and coefficients to indicate the number of molecules.
Atoms and molecules
- The document discusses atoms, ions, molecules, elements, compounds, and chemical formulas and reactions.
- Atoms combine to form molecules, and molecules made of the same type of atom are elements, while molecules with different atom types are compounds.
- Chemical formulas use symbols and subscripts to represent the elements and number of each type of atom in a molecule or compound.
- Chemical reactions can release or absorb energy and are classified as exothermic or endothermic respectively.
Atomsandmolecules 100919202417-phpapp02
- The document discusses atoms, ions, molecules, elements, compounds, and chemical formulas and reactions.
- Atoms combine to form molecules, and molecules made of the same type of atom are elements, while molecules with different atom types are compounds.
- Chemical formulas use symbols and subscripts to represent the elements and number of each type of atom in a molecule or compound.
- Chemical reactions can release or absorb energy and are classified as exothermic or endothermic respectively.
Atoms and Molecules
- The document discusses atoms, ions, molecules, elements, compounds, and chemical formulas and reactions.
- Atoms combine to form molecules, and molecules made of the same type of atom are elements, while molecules with different atom types are compounds.
- Chemical formulas use symbols and subscripts to represent the elements and number of each type of atom in a molecule or compound.
- Chemical reactions can release or absorb energy and are classified as exothermic or endothermic respectively.
Chemistry objective final exam review
The document provides an overview of the topics and concepts covered on an upcoming chemistry objective final exam, including periodic trends, ionic and covalent bonding, chemical reactions, stoichiometry, the mole concept, and properties of elements and compounds. Students should review chapters 6 through 12, which focus on the periodic table, bonding models, reaction types, quantitative relationships in chemical reactions, and calculations involving moles, grams, and particles. The exam will contain 50 multiple-choice questions testing this material.
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Chapter 6.2 : Covalent Bonding and Molecular Compounds
Chapter 6.2 : Covalent Bonding and Molecular Compounds
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The document discusses balancing chemical equations by ensuring that the number of atoms of each element is equal on both sides of the equation. It provides examples of unbalanced equations and steps to balance them by adjusting only the coefficients while keeping the subscripts the same. Rules for balancing equations include only changing coefficients, never changing subscripts, multiplying subscripts by coefficients, writing compounds before elements, and balancing elements last.
5.2 Lecture
There are 5 general types of chemical reactions:
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2. Decomposition reactions break down a single substance into two or more new substances.
3. Combustion reactions involve burning and produce carbon dioxide, water, and other products.
4. Single displacement reactions involve one element replacing another in a compound.
5. Double displacement reactions involve the switching of cations and anions between two compounds.
5.1 Notes
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5.4 Lecture
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15[1].3 Lecture
The document discusses three topics related to oceans:
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15.2 Lecture
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15[1].1 Lecture
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Ionic Bonding 2008
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みなさんこんにちはこれ何文字まで入るの？40文字以下不可とか本当に意味わからないけどこれ限界文字数書いてないからマジでやばい文字数いけるんじゃないの？えこ...
みなさんこんにちはこれ何文字まで入るの？40文字以下不可とか本当に意味わからないけどこれ限界文字数書いてないからマジでやばい文字数いけるんじゃないの？えこ...
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4.1 Lecture 2008
- 1. Chapter 4.1 Compounds & Molecules Pages 108 - 114
- 2. Goal 1 Distinguish between compounds and mixtures
- 5. Goal 2 Recall how to read a chemical formula
- 11. Goal 3 Understand chemical structure models
- 20. Goal 4 Understand the effects chemical structure has on properties of compounds