Describe the linear combination of atomic orbitals (LCAO) below: Select the correct answer below: The top one is out-of-phase overlap resulting in a bonding orbital, and the bottom one is in-phase overlap resulting in an antibonding orbital. The top one is out-of-phase overlap resulting in an antibonding orbital, and the bottom one is out-of-phase overlap resulting in a bonding orbital. The top one is in-phase overlap resulting in a bonding orbital, and the bottom one is out-of-phase overlap resulting in an antibonding orbital. The top one is in-phase overlap resulting in an antibonding orbital, and the bottom one is out-of-phase overlap resulting in a bonding orbital.
The image provided shows two 3px orbitals. Predict what type of molecular orbital will result. Select the correct answer below: σ3p σ3p∗ π3p π3p∗
How many electrons are in antibonding molecular orbitals based on the molecular orbital diagram for O2 given that each O electron configuration is (2s22p4) ? Do not include electrons from the 1 s shell in your count. Select the correct answer below: 2 3 4 6
For a diatomic molecule, how many molecular orbitals will have an n value of 1? Select the correct answer below: 1 2 3 4
For a given n, which of the following is the lower energy molecular orbital? Select the correct answer below: antibonding bonding both bonding and antibonding can be lower energy there is not enough information to determine this.
When filling molecular orbitals, which orbital would we fill first? Select the correct answer below: antibonding orbital bonding orbital half of the time we fill the antibonding orbital first and half of the time we fill the bonding orbital first depends on the molecule
How many electrons will be shown in the molecular orbitals section on the molecular orbital diagram for H2 ? Select the correct answer below: 1 2 3 8
In a molecular orbital diagram, which of the following is listed down the right and lefthand sides of the diagram? Select the correct answer below: atomic orbitals atomic direction molecular orbitals molecular direction
Molecular orbital diagrams can be written for: Select the correct answer below: homonuclear diatomic molecules heteronuclear diatomic molecules triatomic molecules all of the above
Which of the following must be included in molecular orbital diagrams? Select the correct answer below: valence electrons core electrons excited electrons all of the above
How many molecular orbitals will have an n value of 2? Select the correct answer below: 2 4 6 8
How many filled molecular orbitals are present in the molecular orbital diagram for H2 ? Select the correct answer below: 1 2 4 8
You should fill orbitals first when constructing a molecular orbital energy diagram. Select the correct answer below: lower-energy higher-energy d p
When two atomic orbitals combine, they will generate: Select the correct answer below: one molecular orbital, a bonding orbital one molecular orbital, an antibonding orbital one bonding orbital and one antibonding orbital depends on the atomic orbitals involved
What is the maximum bond order that is possible for a bond between elements in the first two rows of the periodic table? Report your answer as a whole number without any decimal places. Provide your answer below:
What is the maximum bond order that is possible for a bond between elements in the second row of the periodic table? Select the correct answer below: 1 2 3 4
Bond order allows us to identify: Select the correct answer below: A. the mass of the electrons based on bond strength B. the net number of electron pairs participating in bonding interactions both A and B neither A or B
Which molecule will have a bond order of zero? Select the correct answer below: H2 He2 Li2 F2
What is the highest occupied bonding orbital for Ne2? Select the correct answer below: σ2p σ2s π2p σ3s
Which electron-pair geometries have bond angles of 90∘ ? Select the correct answer below: linear and trigonal planar tetrahedral and octahedral trigonal bipyramidal and octahedral trigonal planar and trigonal bipyramidal
Predict the molecular structure of NO3−, whose Lewis structure is shown below. Select the correct answer below: Tetrahedral Square pyramidal Trigonal planar Bent
Which is a polar molecule (has a molecular dipole moment)? Select the correct answer below: CF4 NF3 BF3 PF5
Predict the molecular structure around the carbon labeled 1 in acetone, whose Lewis structure is drawn below. Select the correct answer below: Tetrahedral Trigonal pyramidal Bent Trigonal planar
What is true about pi bonds? Select the correct answer below: The electron density lies along the internuclear bonding axis. They are stronger than sigma bonds. They are formed from side to side overlap of p orbitals They are the only bonds found in a multiple bond.
The H−X bond length is 105 pm and the H−Y bond length is 119 pm. Which of the following statements is most likely true about the bonding in H−X and H−Y assuming X and Y are in the same period on the periodic table? Select the correct answer below: There is greater orbital overlap between H and Y than between H and X. There is greater orbital overlap between H and X than between H and Y. H−Y is a stronger bond than H−X. The H−Y bond energy is greater than the H−X bond energy.
What type of molecular orbital is produced from the out-of-phase combination of side-by-side overlap of two atomic p orbitals? Select the correct answer below: σp σp∗ πp πp∗
What is the ground state electron configuration for the He2+ ion? Select the correct answer below: (σ1s)2(σ1s∗)2 (π1s)2(π1s∗)2 (π1s)2(π1s∗)1 (σ1s)2(σ1s∗)1
What is the bond order for the F2 molecule? Report your answer as a whole number without any decimal places. Provide your answer below:
A homonuclear diatomic molecule is found to have a bond order of 2. If there are 10 electrons in bonding orbitals, how many electrons are in antibonding orbitals? Report your answer as a whole number without any decimal places. Provide your answer below:
If a compound's formula mass is experimentally determined to be 40, the chemical formula could be: Select the correct answer below: MgF2 NaOH NaF KF
If a compound has a formula mass of 119, the chemical formula could be: Select the correct answer below: KBr NaI MgO CaCl2
The sum of the average atomic masses of all the atoms present in a substance's formula is known as: Select the correct answer below: the atomic mass the formula mass (molecular mass) an atomic mass unit the mass number
If compound's formula mass was experimentally determined to be 58, the chemical formula could be: Select the correct answer below: C4H8 C2H6O2 C3H8 C3H6O
If a compound's formula mass was experimentally determined to be 34, the chemical formula could be: Select the correct answer below: SiH4 H3P HCl HBr
If a compound's formula mass was experimentally determined to be 18, the chemical formula could be: Select the correct answer below: CH4 NH3 H2O PCl5
The sum of the average atomic masses of all the atoms present in a substance's formula is known as: Select the correct answer below: the atomic mass the formula mass the mass unit the compound mass
If a compound has a formula mass of 62 amu, the chemical formula could be: Select the correct answer below: Na2 O CaO KF MgO
What will be the mass of one mole of carbon atoms? Select the correct answer below: 12 g 12 amu 6.022×1023 g 6.022×1023 amu
Which of the following is equivalent to a mole of carbon atoms? Select the correct answer below: 0.6022×1023 carbon atoms 6.022×1023 carbon atoms 12 carbon atoms There is not enough information to answer this question.
If we compare a mole of carbon atoms to a mole of oxygen atoms, which sample will contain more atoms? Select the correct answer below: the carbon sample the oxygen sample they will contain the same number of atoms impossible to tell
The mass of 1 mole of CO2 is: Select the correct answer below: 44 moles 44 atomic mass units 44 kilograms 44 grams
How many moles of hydrogen gas are in 8.0 g of H2? Your answer should have two significant figures. Provide your answer below: mol
How many moles of NaNO3 are present in a 44.0 g sample? Your answer should have three significant figures. Provide your answer below: mol
How many moles of LiF are present in a 42.0 g sample? Your answer should have three significant figures. Provide your answer below: moles
How many atoms are in a 24 g sample of carbon? Select the correct answer below: 6.02×1024 6.02×1023 1.2×1023 1.2×1024
How many oxygen atoms are present in a 10.0 g sample? Use 6.022×1023 mol−1 for Avogadro's number. Select the correct answer below: 3.76×1023 3.76×1022 3.76×1024 1.60×1023
What is the mass in grams of 1.00×106 sodium atoms? Report your answer in scientific notation. Your answer should have three significant figures. Provide your answer below: ×10 g
How many lithium atoms are in a 12.0 g sample? Your answer should have three significant figures. Provide your answer below: atoms
There are molecules in 12 grams of UF6. Your answer should have two significant figures. When entering your answer in scientific notation form, use the multiplication sign, ×, not the letter x. Provide your answer below: molecules
Calculate the number of total atoms in 195 grams of Ni(OH)2. Use 6.022×1023 mol−1 for Avogadro's number. Report your answer in scientific notation using the multiplication symbol, ×, not the letter x. Your answer should have three significant figures. Provide your answer below: atoms
Penicillin G, also known as benzylpenicillin, is an antibiotic. Its chemical formula is C16H18N2O4S. What is the molecular mass of penicillin G ? Your answer should have six significant figures. Provide your answer below: amu
Calcium chloride is used as a deicer for melting ice and snow on roadways and sidewalks. Its chemical formula is CaCl2. What is the formula mass of calcium chloride? Your answer should have five significant figures. Provide your answer below: amu
The molecular mass of water (H2O) is 18.02 amu. What is the molar mass of water? Select the correct answer below: 18.02 g/mol 6.022×1023 g/mol 1.085×1025 g/mol 2.992×10−23 g/mol
How many formula units of barium fluoride (BaF2) are in 1.63 g of BaF2? When reporting your answer in scientific notation format, use the multiplication symbol, ×, not the letter x. Report your answer using three significant figures. Provide your answer below: formula units