All ionic compounds are solids in their standard state (25 degrees Celsius and 1 atmosphere). Ionic compounds are composed of ions; elements or molecules which are positively charged are called cations and elements or molecules which are negatively charged are called anions. A simple model to be used to imagine what ions (cations or anions) look like at the atomic level, is a sphere. For simple monoatomic ions and most polyatomic ions we can think of as charged spheres of different sizes.
In the state the spheres (ions) are arranged so that any particular ion is surrounded by the oppositely charged ion. What ever pattern which arises depends on several factors which we will not be discussing at this point in our class. Below is a picture of a model of a simple ionic compound. Notice the spheres (ions) of different sizes and how each sphere (ion) is surrounded by the other spheres (ion).
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What happens when an ionic compound dissolves in water? Below is a figure of a small crystal of sodium chloride surrounded by water molecules. We all know when sodium chloride is added to water the crystals of sodium chloride disappear, dissolve.
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What happens when the sodium chloride dissolves? Below is a picture showing a chloride ion (larger sphere) and a sodium ion (smaller sphere) dissolved in water.
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Notice how water surrounds (hydrates) each ion. For the negatively charged chloride ion the
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Chemistry H Ch.7-8 Test Study Guide Ion formation, gain/lose electrons: - Ions are formed when an atom gains or loses electrons and get charged. - If an atom gains electrons, an atom gets negatively charged (Anion). - Similarly if an atom looses electrons, the atom becomes positively charged (Cation). Ionic Compounds, properties: - A compound that is composed entirely of ions is called an ionic compound. - Ionic compounds are formed from a metal and a non-metal. - Ionic compounds…
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Chemistry Honors Pre-Lab Worksheet Q.)Which type of compound usually has higher melting points: ionic compounds or covalent compounds? What is the reason for this difference in melting points? A.) Ionic compounds have higher melting points than covalent compounds. Its’ caused by the electrostatic attraction in an ionic bond which is very strong hence a lot of heat energy is required to break it down. Whereas covalent bonds, the forces are very weak and is easily broken. Q.) Do ionic compounds…
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Table Of Contents Math Of Chemistry Significant Figures Units Of Measurement Atomic Structure History Of Atomic Theory Difference Between Bohr And Wave Mechanical Models Atomic Mass Atomic Number Average Atomic Mass(sample Calculations) Isotopic Notations Atomic Calculations Ions(atomic Charge) Isotopes Electrons Electric Configurations Lewis Dot Diagram(electron Dot)Diagrams for Atoms And Ions Exited And Ground State Atomic Spectra Periodic Table Group Vs. Periods What do the…
Introduction In chemistry, we divide compounds into two kinds, one is called ionic compounds and the other one is called molecular compounds (covalent compounds). Specifically, an ionic compound is a compound that ions are held together in a lattice structure by ionic bonds; a molecule compound is a compound that two or more atoms held together by covalent bonds. Due to the different form of bonds, different compounds have different properties. For example, ionic compounds are often hard; have…
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Maleckar Chem 960 Fall 2012 Exam 1 Review Sheet Chapter 1: Chemistry: The Science of Change know how many significant digits are present in a number be able to carry out a mathematical problem and report an answer with the correct number of significant digits Chapter 2: Atoms and the Periodic Table know Dalton’s Postulates and understand them understand Thomson’s model for an atom understand what Millikan did understand Rutherford’s model for an atom…
Chemistry Exam Semester 1 Study online at quizlet.com/_255v8 1. acetate C₂H₃O₂⁻ 26. chemical formula shows the kinds and number of atoms in the smallest representative unit of a substance 2. ACETIC ACID CH3COOH 3. ACETONE CH3COCH3 4. alloys mixtures of two or more elements, at least one of which is metal 27. chemistry the study of the composition of matter & the changes it undergoes 5. Alpha (∝) +2 charge 6. AMMONIA NH3…
