Podcast
Questions and Answers
What is the representative unit of a molecular compound?
What is the representative unit of a molecular compound?
What types of elements primarily compose ionic compounds?
What types of elements primarily compose ionic compounds?
Which of the following describes the bonding in sodium chloride?
Which of the following describes the bonding in sodium chloride?
What type of forces connects carbon dioxide molecules?
What type of forces connects carbon dioxide molecules?
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What is the representative unit of an ionic compound?
What is the representative unit of an ionic compound?
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Which characteristic is NOT typical of covalent network solids?
Which characteristic is NOT typical of covalent network solids?
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What distinguishes ionic solids from molecular solids?
What distinguishes ionic solids from molecular solids?
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Which of the following is an example of a carbon allotrope?
Which of the following is an example of a carbon allotrope?
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What is a defining property of covalent network solids compared to ionic solids?
What is a defining property of covalent network solids compared to ionic solids?
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What would be the best choice for creating a high-speed cutting tool?
What would be the best choice for creating a high-speed cutting tool?
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What must be requested before leaving the classroom?
What must be requested before leaving the classroom?
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Which characteristic is essential for a material to conduct electricity?
Which characteristic is essential for a material to conduct electricity?
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What molecular structure allows atoms in a molecular compound to share electrons?
What molecular structure allows atoms in a molecular compound to share electrons?
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Which solid is indicated to be most useful for making high-speed cutting tools?
Which solid is indicated to be most useful for making high-speed cutting tools?
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Which of the following properties might you evaluate to determine the best solid for use in paints?
Which of the following properties might you evaluate to determine the best solid for use in paints?
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Which of the following compounds is likely not suitable for paint pigments based on heat resistance criteria?
Which of the following compounds is likely not suitable for paint pigments based on heat resistance criteria?
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How does melting point relate to the molecular structure of ionic solids?
How does melting point relate to the molecular structure of ionic solids?
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Which property might indicate the solubility of a solid in water?
Which property might indicate the solubility of a solid in water?
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Study Notes
Investigation 5 Experience 3
- Reminders: Cell phones off and put away during class. Request an e-hall pass before leaving the classroom. No food or drinks (besides water) in the classroom.
Agenda
- Demo
- Virtual Lab
- Explanation
- Skill Check 5.3
Demo
- Observe crystals, focusing on physical properties of ionic and molecular solids.
Virtual Lab: Tough Tools
- Navigate to SAVVAS and open the Virtual Lab: Tough Tools.
- Evaluate the properties of three different solids to determine which is best for high-speed cutting tools.
- Record observations and answer questions in handout.
Virtual Lab: Tough Tools - Questions
- Explain melting point order of tested solids based on their molecular structure (ionic, molecular, or covalent network).
- Relate electron flow and molecular structure of tested solids to their electrical conductivity.
- Choose hardness, thermal conductivity, or solubility in water and discuss how this property relates to the molecular structure of one of the tested solids.
- Identify the most useful solid for a high-speed cutting tool and explain why.
- Determine whether silicon dioxide, naphthalene, or cobalt (II) chloride would be best for a heat-resistant pigment application and explain.
Comparing Ionic and Molecular Compounds
- Molecular compounds: atoms share electrons through covalent bonds; the representative unit is a molecule.
- Ionic compounds: ions held together by electrostatic forces; the representative unit is the formula unit.
Representative Units
- Molecular compounds: collection of water molecules; molecule of water; chemical formula.
- Ionic compounds: array of sodium ions and chloride ions; formula unit of sodium chloride; chemical formula.
Determining Compound Type
- Use the periodic table to determine compound type and bond types.
- Ionic compounds are composed of metals and nonmetals, while molecular compounds are composed of nonmetals.
Properties of Ionic and Molecular Compounds
- Molecular Compounds: Weak dispersion or weak hydrogen forces, low melting points, volatile.
- Ionic Compounds: Strong ionic forces, high melting points, not volatile.
Covalent Network Solids
- Covalent network solids are held together by covalent bonds, resulting in high melting points.
- Allotropes are different physical forms of the same element (e.g., carbon nanotubes, graphite, diamond, fullerenes).
Physical Properties of Substances
- How materials are designed for specific functions.
- Which solid is most useful for making a high-speed cutting tool?
Checkpoint
- Identify unknown white solid as ionic, molecular, or covalent network solid.
Skill Check 5.3
- Log onto Formative using school account.
- Complete Skill Check 5.3 independently.
- Work on Continuous Improvement.
- Due by 11:59 PM.
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Description
Dive into the properties of ionic and molecular solids through a detailed investigation. This quiz includes a virtual lab experience where you will evaluate different solids to determine their effectiveness for high-speed cutting tools while also answering questions related to their physical properties. Enhance your understanding of molecular structures and their implications in real-world applications.
