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Quizzes

Quick multiple-choice questions shared by teachers and students.

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4211 quizzes
Zara counts 10 electrons in the bonding and 4 in the antibonding molecular orbitals of dinitrogen. What bond order does that give? New
High School (11–12) · Molecular Orbitals and Hydrogen Bonds
StemPy LabStemPy Lab
Easy
Kabir says two atoms cannot hold together as a molecule if their antibonding electrons cancel their bonding ones. For which pair of atoms is that true? New
High School (11–12) · Molecular Orbitals and Hydrogen Bonds
StemPy LabStemPy Lab
Easy
Liquid oxygen poured between the poles of a strong magnet stays there. What in the oxygen molecule causes this? New
High School (11–12) · Molecular Orbitals and Hydrogen Bonds
StemPy LabStemPy Lab
Easy
Potassium superoxide, used in breathing kits, contains the ion O₂⁻. What is the bond order of this ion? New
High School (11–12) · Molecular Orbitals and Hydrogen Bonds
StemPy LabStemPy Lab
Medium
Rank the oxygen species O₂⁺, O₂ and O₂⁻ by bond length, from the shortest. New
High School (11–12) · Molecular Orbitals and Hydrogen Bonds
StemPy LabStemPy Lab
Medium
A student draws dotted lines for hydrogen bonds in four liquids. In which liquid are there none to draw? New
High School (11–12) · Molecular Orbitals and Hydrogen Bonds
StemPy LabStemPy Lab
Easy
Steam distillation separates ortho-nitrophenol from para-nitrophenol. Which one comes over with the steam, and why? New
High School (11–12) · Molecular Orbitals and Hydrogen Bonds
StemPy LabStemPy Lab
Medium
Which energy order fits the 2p molecular orbitals of N₂? New
High School (11–12) · Molecular Orbitals and Hydrogen Bonds
StemPy LabStemPy Lab
Medium
Only the 2s and 2p orbitals of two neighbouring atoms are combined. How many molecular orbitals result? New
High School (11–12) · Molecular Orbitals and Hydrogen Bonds
StemPy LabStemPy Lab
Easy
A full bottle of water left in a freezer cracks. What do hydrogen bonds do as the water turns to ice? New
High School (11–12) · Molecular Orbitals and Hydrogen Bonds
StemPy LabStemPy Lab
Medium
Shreya models a V-shaped gas molecule: its central atom sits at 112° between its two partners, and each link carries 1.30 D. What should the molecule measure? New
High School (11–12) · Molecular Orbitals and Hydrogen Bonds, Lewis Structures and Ionic Bonds
StemPy LabStemPy Lab
Medium
Which of these molecules has no dipole moment, though every one of its bonds is polar? New
High School (11–12) · Molecular Orbitals and Hydrogen Bonds, Lewis Structures and Ionic Bonds
StemPy LabStemPy Lab
Medium
Rank the four chloromethanes by dipole moment, from the largest. New
High School (11–12) · Molecular Orbitals and Hydrogen Bonds, Lewis Structures and Ionic Bonds
StemPy LabStemPy Lab
Hard
Rubidium chloride vapour has a dipole moment of 10.51 D and a bond length of 279 pm. What is its percent ionic character? New
High School (11–12) · Molecular Orbitals and Hydrogen Bonds, Lewis Structures and Ionic Bonds
StemPy LabStemPy Lab
Medium
In the best Lewis structure of the chlorite ion, ClO₂⁻, how many electrons surround the chlorine atom? New
High School (11–12) · Molecular Orbitals and Hydrogen Bonds, Lewis Structures and Ionic Bonds
StemPy LabStemPy Lab
Hard
Ammonia joins each boron halide by giving its lone pair to boron. Which boron halide forms the strongest bond with ammonia? New
High School (11–12) · Molecular Orbitals and Hydrogen Bonds, Lewis Structures and Ionic Bonds
StemPy LabStemPy Lab
Hard
How many hydrogen atoms in a molecule of diborane are bonded to both boron atoms? New
High School (11–12) · Molecular Orbitals and Hydrogen Bonds, Lewis Structures and Ionic Bonds
StemPy LabStemPy Lab
Medium
Rank Cl₂O, H₂O and OF₂ by bond angle, from the largest. New
High School (11–12) · Molecular Orbitals and Hydrogen Bonds, Lewis Structures and Ionic Bonds
StemPy LabStemPy Lab
Hard
In the best Lewis structure of the chlorate ion, ClO₃⁻, chlorine has two double bonds and one single bond, all made equal by resonance. What is the bond order of each Cl to O bond? New
High School (11–12) · Molecular Orbitals and Hydrogen Bonds, Lewis Structures and Ionic Bonds
StemPy LabStemPy Lab
Medium
Tin(IV) chloride is a liquid that boils at 114 °C, while tin(II) chloride is a solid that melts at 247 °C. What explains this? New
High School (11–12) · Molecular Orbitals and Hydrogen Bonds, Lewis Structures and Ionic Bonds
StemPy LabStemPy Lab
Medium
VSEPR theory ranks the repulsions between electron pairs on a central atom. Which ranking does it use, from the strongest to the weakest? New
High School (11–12) · Shapes of Molecules and Hybridisation
StemPy LabStemPy Lab
Easy
Selenium sits below sulphur in group 16. How many lone pairs does selenium keep in SeCl₂, and what shape does the molecule take? New
High School (11–12) · Shapes of Molecules and Hybridisation
StemPy LabStemPy Lab
Easy
Arsenic, in group 15, bonds to three bromine atoms in AsBr₃. What shape does this molecule take? New
High School (11–12) · Shapes of Molecules and Hybridisation
StemPy LabStemPy Lab
Easy
Which of these molecules has all its atoms lying in one flat plane? New
High School (11–12) · Shapes of Molecules and Hybridisation
StemPy LabStemPy Lab
Medium
Hydrogen cyanide is H-C≡N. How many sigma and how many pi bonds does one molecule contain? New
High School (11–12) · Shapes of Molecules and Hybridisation
StemPy LabStemPy Lab
Easy
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