CHEMISTRY 1000 Topics of Interest #6: Sodium Acetate: Hot Stuff!

Slides:



Advertisements
Similar presentations
Hot Ice What’s the Problem with the Solution? The Scientists of Medaille Present.
Advertisements

Unit: Chemical Interactions Chapter 8: Solutions When substances dissolve to form solutions, the properties of the mixture change. 8.1: A solution is a.
Polyatomic Ions and Their Compounds. Polyatomic Ions  A polyatomic ion is an electrically charged group of two or more chemically bonded atoms that functions.
Sara Beth Horton.  Many different styles  Two main types ◦ Iron Oxidation ◦ Salt Crystallization  How do they work?  What are the differences?
1 Starts with Teacher giving the name of an ionic compound (+1,-1). AROUND THE WORLD A Chemistry Name Game.
Ionic Compounds and Solutions SNC2D. Electrostatic attraction.
Ionic Bond Chapter 5 Section 2.
Ionic Bonding “Students know atoms combine by exchanging electrons to form ionic compounds, and that salt crystals, such as NaCl, are repeating patterns.
Ionic Bonds Section 3. Ion An atom or group of atoms that has become electrically charged.
Chemical Bonding Ionic Bonding and Ionic Compounds.
Section 6.3 – Ionic Bonding and Ionic Compounds
Ionic Bonding and Ionic Compounds. Atoms and Ions  Atoms are the building blocks of matter (solids, liquids and gases).  For example:  Copper wire.
One brand of reusable physiotherapy heat pad contains a supersaturated solution of sodium ethanoate and a metal disc. Sodium ethanoate is non-toxic and.
Physical Science Ch.5 State of Matter
Physical Properties of Solutions Unit 10 Why are some compounds more effective in melting ice than others?
Warm up Convert the following: 24.3 ml to kl 23Mg to cg.
The Alkali Metals (Group 1 Except Hydrogen)
Ionic Bonding and Naming. Naming Binary Covalent Compounds.
Basic Chemistry for Biology Water and Solutions. Water’s Life Supporting Properties Important to all living things 1.Moderation of temperature 2.Lower.
Introduction to Ionic Compounds. Many ions have a noble gas configuration Ions with a noble gas configuration are stable.
Ionic Bonds and Ionic Compounds
Liquids and Solids Solids.
ENERGY CALCULATION PRACTICE UNIT 3. HOW MUCH ENERGY IS REQUIRED TO HEAT 200 GRAMS OF WATER FROM 25˚C TO 125˚C? HOW MUCH ENERGY IS RELEASED WHEN COOLING.
Chemical Formulas and equations
1. To learn to name binary compounds of a metal and nonmetal 2. To learn to name binary compounds containing only nonmetals 3. To summarize the naming.
Water: Essential to life Chapter 10. A molecule essential to life Water is the most abundant liquid on earth, covering over 70% of the planet Water is.
Ionic Bonding and Ionic Compounds
States of Matter Physical and Chemical Changes Classifying Matter.
Page 77 Strength of Chemical Bonds Tuesday – Polyatomic Quiz -1’s Wednesday – Polyatomic Quiz Mixed *** Thursday – Polyatomic Quiz Mixed 2 Friday – Polyatomic.
Section 7.2. Forming Ionic Compounds Since ions have charges, ions with opposite charges will be attracted to each other. The force that pulls them together.
Properties of ionic compounds Standard chem Objectives 7 Properties of ionic compounds and relation to the ionic bond.
Properties of Ionic Compounds. Member List Ho Kin Keung (3) Lam Cho Yuen(4) Lam Po Wa(5) Lee Ho Yin (8) Ng Sai Cheong(11) Pang Wai Fung(12)
Unit 3: Ionic Bonding, Naming & Metallic Bonding.
Chapter 5: Molecules and Compounds.  Write formulas for ionic compounds.
Properties of Ionic and Covalent Compounds
Topic #2: The Chemical Alphabet Fall 2008 Dr. Susan Lait
Water Chemistry Mrs. Wisher. What is Chemistry?  Chemistry is the study of the properties of matter and how matter changes  Matter – the stuff that.
Compounds.
5. Formation of Ionic Compound s Compounds composed of cations and anions are called ionic compounds. Although they are composed of ions, ionic compounds.
Crystallization is a separation technique that is used to separate a solid (SOLUTE) that has dissolved in a liquid (SOLVENT) and made a solution (homogenous.
Ionic Bonds. Chemical Bonds  The force that holds two atoms together is called a chemical bond.
1 How they Form Mr. ShieldsRegents Chemistry U12 L04.
Physical Properties of Solutions Honors Unit 10. Solutions in the World Around Us.
Chapter 8 Chapter 8 Ionic Compounds Chemical Bond – the force that holds atoms together Cations are + electrons are lost Anions are - electrons are gained.
IONIC AND COVALENT BONDS 4 TH BLOCK CHEMISTRY. WARM-UP 1.What is the trend of valence electrons on the periodic table? 2.What is the trend of the ion.
Section 4.2 Naming and Writing Formulas for More Complex Compounds 1.To learn the names of common polyatomic ions 2.To learn to name compounds containing.
Bond. Ionic Bond Unit 4: Ionic Compounds Formation of Ionic Compounds Ionic compounds are composed of cations (metals) and anions (nonmetals). Although.
Group-6.  An ion is an atom or group of atoms that have a net electrical charge. An ion is formed when electrons or protons are gained or lost by an.
Ionic Compound. Content What is ionic compound? Properties Uses of ionic compounds Group members.
© Copyright Pearson Prentice Hall Slide 1 of 25 Ionic Bonds and Ionic Compounds In many coastal countries that have warm, relatively dry climates, salt.
Chapter 6: Chemical Bonding
Modern Chemistry Chapter 6 Chemical Bonding
Chapter 6 Ionic Compounds
Ch 5 Ions and Ionic Compounds
Ionic Bonds and Compounds
Ch. 7 Ionic and Metallic Bonding
Ionic, Covalent, and Metallic Bonding
Bonding.
Physical & Chemical Changes
Ionic Compounds.
Metals - Jeopardy Ionic Bonding Model Ionic Compounds Metallic Bonding
Ionic Bond Chapter 5 Section 2.
Ionic Bond Chapter 5 Section 2.
Formation of Ionic Compounds
I. Why Atoms Combine Chemical Formulas Chemical Bonds Stability
Formation of Ionic Bonds
Notes- Properties of Ionic Compounds #3
Holding Atoms Together
Warm-Up 10/17/16 Name the difference between an ionic and covalent compound that you learned Friday.
Ionic Compounds.
Presentation transcript:

CHEMISTRY 1000 Topics of Interest #6: Sodium Acetate: Hot Stuff!

Sodium acetate is an ionic compound. The main difference between it and the ionic compounds we’ve seen so far in class is that the anion isn’t monoatomic; it’s polyatomic: Like the other ionic compounds we’ve seen in class, sodium acetate forms a lattice. An aqueous solution of sodium acetate will form a lattice incorporating three water molecules per formula unit of sodium acetate. This gives an overall formula of Na(CH 3 CO 2 )  3H 2 O, called sodium acetate trihydrate. So, if a solution was prepared from a 1 : 3 mixture of sodium acetate : water, the whole solution would freeze as a single lattice (looking more like ice than like a precipitate). Sodium Acetate Heat Pads (has video)

Sodium acetate trihydrate has a freezing point (or melting point) of 58  C – a temperature similar to that of hot water from a tap. Sodium acetate trihydrate also has the interesting property that it can be supercooled – cooled below its freezing point without actually freezing. This is the basis of sodium acetate heating pads: A supercooled solution of sodium acetate in water is sealed inside a plastic bag containing a metal disk. The metal disk can be pressed to release a tiny crystal of sodium acetate which instantly provides a “nucleation site” so that the rest of the solution solidifies into a lattice. Heat is released as the cations and anions come together to form an ordered ionic lattice (enthalpy of lattice formation!), warming the heat pad up to about 58  C. The heat pad can be “regenerated” by heating it enough that the sodium acetate trihydrate melts then allowing it to slowly cool (without pressing the disk) without freezing. Sodium Acetate Heat Pads (has video)