Investigation 5 Experience 3 PDF

Investigation 5 Experience 3 Reminders Cell phones off & put away during class Request an e-hall pass before leaving the classroom No food/drinks (besides water) in the classroom  Click here to view the Agenda Word Wall Demo Virtual Lab E...

Investigation 5 Experience 3 Reminders Cell phones off & put away during class Request an e-hall pass before leaving the classroom No food/drinks (besides water) in the classroom  Click here to view the Agenda Word Wall Demo Virtual Lab Explain Skill Check 5.3 Demo What have you noticed about crystals? As you watch this demo, think about the physical properties in ionic and molecular solids. Virtual Lab: Tough Tools Navigate to SAVVAS and open the Virtual Lab: Tough Tools. In this activity, you will evaluate the properties of three different solids to see which one might be the most useful for making high-speed cutting tools. Record your observations on your handout and answer the questions. Virtual Lab: Tough Tools 1. Explain the order of melting points for the solids you tested using what you know about the molecular structures of ionic, molecular, and covalent network solids. 2. Electrons must be able to flow through a material in order for the material to conduct electricity. Relate the molecular structure of the solids you tested to their ability to conduct electricity. 3. Choose hardness, thermal conductivity, or solubility in water and explain how the property relates to the molecular structure of one of the solids you tested. 4. Which solid would be most useful for making a high-speed cutting tool? Why? 5. Paint pigments must be heat resistant and stable in a powder for transport in cargo trucks that can become very hot. Pigments are mixed into water-based stock paints when a customer orders a specific paint color. Based on their various properties, would silicon dioxide, naphthalen, or cobalt (II) chloride be best for this application? Note-taking Options Comparing Ionic and Molecular Compounds CO2 H2O NaCl Copyright © Savvas Learning Company LLC. All Rights Reserved. Savvas is not responsible for any modifications made by end users to the content posted in its original format. Representative Units In a molecular compound, atoms share electrons through covalent bonds. The representative unit of a molecular compound is a molecule. Ionic bonds are formed by ions held together by electrostatic forces. The representative unit of an ionic compound is the formula unit. Photo credits: Nubephoto/Shutterstock; Christopher Elwell/Shutterstock Determining Compound Type How could you determine the types of bonds in a compound? What types of elements make up an ionic compound? What types of elements make up molecular compounds? Properties of Ionic and Molecular Compounds Carbon dioxide molecules are connected by weak dispersion forces, water by hydrogen bonds, and sodium chloride by ionic bonds. Weak dispersion Weak hydrogen Strong ionic Gas Liquid Solid Low melting point Low melting point High melting point Volatile Volatile Not Volatile Photo credits: Jeff J Daly/Alamy Stock Photo; Andreykuzmin/Shutterstock; Sirtravelalot/Shutterstock Covalent Network Solids graphite Bucky ball Covalent network solids are held together by covalent bonds instead of weak intermolecular forces. As a result, they have bulk properties such as high melting points. Allotropes are different physical forms of the same Carbon element. For example, the nanotube picture shows allotropes of carbon – carbon diamond nanotubes, graphite, and fullerenes. What is another allotrope of carbon? Which solid would be most useful for making a high- speed cutting tool? Checkpoint: Suppose you have a few small chunks of an unknown white solid. How could you identify whether it is an ionic solid, a molecular solid, or a covalent network solid? Skill Check 5.3 Log onto Formative using your school account. Complete “Skill Check 5.3” independently and then work on Continuous Improvement. Skill Check is due by 11:59 PM.