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Questions and Answers
What is the primary purpose of sulfur hexafluoride (SF6) in ultrasound imaging?
What is the molecular shape of the complex formed when EDTA chelates a metal ion?
Which ion does EDTA specifically chelate?
What role does water play when FeSO4 is dissolved in water?
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Which of the following best describes a common use of ethylenediaminetetraacetic acid (EDTA)?
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In ultrasound imaging, what is improved by the echogenicity of blood?
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What is the chemical representation of EDTA in its disodium form?
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Which metal ion is mentioned as an example of the one that EDTA can chelate?
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What form does sulfur hexafluoride take in ultrasound applications?
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Which term describes the octahedral complex formed during the dissolution of FeSO4 in water?
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Which molecular shape best describes ammonia (NH3)?
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What is the molecular geometry of water (H2O)?
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Which of the following best describes the molecular shape of cisplatin, cis-PtCl2(NH3)2?
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What is the molecular shape of sulfur hexafluoride (SF6)?
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Which statement about the molecular shape AB4E2 is accurate?
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How many lone pairs of electrons are present in water (H2O)?
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In an octahedral molecular structure, how many atoms are typically bonded to the central atom?
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Which molecular shape does NOT correspond to the formula AB2E2?
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What is the common physical state characteristic of sulfur hexafluoride (SF6)?
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What molecular shape would you expect for a molecule with the formula AB3E?
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What angle is predicted by VSEPR theory for methane (CH4)?
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Which of the following correctly describes the repulsion order according to VSEPR theory?
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What is the angle of the sulfite ion (SO32–)?
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Which ion does Fe2+ predominantly interact with in the provided content?
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How should a multiple bond be treated in VSEPR theory?
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Which molecular geometry corresponds to the central atom configuration AB4?
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What is the actual bond angle for water (H2O) as stated?
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In the VSEPR model, which of the following contributes most to bond angle distortion?
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Which statement about the bonding in methane is true?
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For a molecule with the formula AB3E, what is the expected shape?
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Study Notes
Molecular Shape – AB3E (Trigonal Pyramidal)
- The molecule ammonia (NH3) has a trigonal pyramidal shape.
- This shape is determined by the four electron pairs around the nitrogen atom.
- The nitrogen atom has one lone pair and three bonding pairs.
- The three hydrogen atoms are bonded to the nitrogen atom at an angle of about 107°.
Molecular Shape – AB2E2 (Bent, Angular, V-shaped)
- The molecule water (H2O) has a bent, angular, V-shaped shape.
- The shape is determined by the four electron pairs around the oxygen atom.
- The oxygen atom has two lone pairs and two bonding pairs.
- The two hydrogen atoms are bonded to the oxygen atom at an angle of about 104.5°.
Molecular Shape – AB4E2 (Square Planar)
- The molecule cisplatin (cis-PtCl2(NH3)2) has a square planar shape.
- The platinum atom has four bonding pairs and two lone pairs.
- The platinum atom is bonded to two chlorine atoms and two ammonia molecules.
- All four atoms are arranged in a square planar shape.
Molecular Shape – AB6 (Octahedral)
- The molecule sulfur hexafluoride (SF6) has an octahedral shape.
- The central sulfur atom is bonded to six fluorine atoms.
- The fluorine atoms are located at the corners of a regular octahedron.
- SF6 is colorless, odorless, non-flammable, has a boiling point of –64°C and a density of 6.2 g/L.
- SonoVue® is a liquid containing microbubbles of SF6 which are used with ultrasound imaging to enhance blood echogenicity.
EDTA
- EDTA (ethylenediaminetetraacetic acid) is a chelating agent.
- EDTA forms an octahedral complex with divalent transition metal ions like Fe2+.
- Disodium edetate (Na2EDTA) is used as an eye lubricant for dry eyes.
VSEPR Theory
- The Valence Shell Electron Pair Repulsion (VSEPR) theory describes the shapes of molecules.
- The theory states that electron pairs around a central atom will arrange themselves as far apart as possible to minimize repulsive forces.
- Lone pairs of electrons exert a greater repulsive force than bonding pairs.
- The angles between bonding pairs in a molecule will be less than the theoretical angle due to lone pairs repelling the bonding pairs.
- Treat a multiple bond as though it were a single bond.
- The VSEPR theory helps predict the shapes of a wide variety of molecules.
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Description
Test your understanding of molecular shapes with this quiz focused on the trigonal pyramidal, bent, and square planar configurations. Explore the structures of ammonia, water, and cisplatin, and learn how lone and bonding pairs influence molecular geometry. Perfect for chemistry students looking to solidify their knowledge of molecular shapes.
