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level: Level 1

Questions and Answers List

level questions: Level 1

Atoms with the same number of protons but different numbers of neutrons are called __________.isotopes
What isotope of chlorine has the same number of neutrons as Argon-38? A) 17 Cl, B) 35 Cl, C) 36 Cl, D)37 Cl, E) 38 ClD
Which of the following elements does this electronic configuration represent? 1s2 2s2 2p5 F C N Al OF
How many unpaired electrons are present in the isolated carbon atom (atomic number = 6)? none, one, two, three, fourtwo
Which of the following is the electronic configuration of the element Fe?1s2 2s2 2p6 3s2 3p6 4s2 3d6
Ar, K+, Cl- are isoelectronic elements (elements with the same number of electrons). What orbital does the last electron occupy?3p orbital
The atomic number of boron is 5. The correct electronic configuration of boron is:1s2 2s2 2p1
Which of the following statements correctly describes the third electron shell that surrounds the nucleus of an atom?The maximum number of electrons that can occupy the third shell is 18.
Which of the following describes a hydride ion?a negatively charged hydrogen ion containing a pair of electrons
Rank the following atoms in increasing electronegativity. N, Na, Si, O , CNa, Si, C, N, O
Using the symbol δ+ and δ-, indicate the direction of the polarity in the indicated bond.down below δ- δ+ .. CH3O--H ..
Covalent bonds may be polar or nonpolar. What property of the atoms forming a given bond determines this?electronegativity
The compound methylamine, H3C-NH2, contains a C-N bond. In this bond, which of the following best describes the charge on the nitrogen atom?slightly negative
Which of the compounds below bond predominantly via ionic bonding?KCl
What type of bonding is most important in CH3CH2CH2CH2CH2CH3?covalent
Which of the following contain(s) polar covalent bonds?NH3
What is the name given for a species that contains a positively charged carbon atom?carbocation
Which of the following is the most likely (i.e. most stable) electronic structure for C2H2?here
Which of the following structures, including formal charges, is correct for diazomethane, H2CN2?here on first N + Second N -
What are the formal charges on nitrogen and the starred oxygen atom in the following molecule?N= +1, O = 0
The formal charge on nitrogen in the compound below is __________.+1
Draw condensed structures for the four compounds with formula C3H9N.CH3CH2CH2NH2 CH3CH2NHCH3 (CH3)2CHNH2 (CH3)3N
How many distinct p orbitals exist in the second electron shell?3
Both sigma (σ) and pi (π) bonds can be formed by overlapping p orbitals. Describe the difference.Sigma bonds are formed from the overlap of atomic orbitals along a circular axis of symmetrical nature, i.e., head-on overlap. All single bonds are sigma bonds. Pi bonds are formed from the overlap of atomic orbitals along a non-symmetrical (parallel) axis, i.e., side-to-side overlap. Double and triple bonds are pi bonds.
Choose the correct hybridization for the atom indicated in the molecule below. CH3CH2CH2CH3sp3
What orbitals are used to form the covalent bonds in butane (CH3CH2CH2CH3)?The carbon-carbon σ bonds are formed by the overlap of two carbon sp3 hybrid atomic orbitals. The carbon-hydrogen σ bonds are formed by the overlap of a carbon sp3 hybrid atomic orbital and a hydrogen s orbital.
Which of the following is a nonpolar molecule?H2
Which of the following is a correct formula for a compound?CH3CH(CH3)CH2CH3
How many electrons are involved in a carbon-carbon double bond?4
Which of the following describes a triple bond?one sigma bond and two pi bonds
Which carbon(s) in the following molecule is (are) sp hybridized?carbon 4, 5
What is the predicted shape, bond angle, and hybridization for +CH3?trigonal planar, 120°, sp2
What orbitals overlap to create the H-C bond in CH3+?s-sp2
The lone-pair electrons of the methyl anion occupy a __________ orbitalsp3
Explain why the water molecule has a bent shape and a bond angle less than 109.5°.The electron replusion between the two lone pairs of electrons on the oxygen of water causes the O-H bonds to squeeze close together.
Which of the following is closest to the C-O-C bond angle in CH3-O-CH3?109.5°
triethylamine [(CH3CH2)3N] is a molecule in which the nitrogen atom is __________ hybridized and the CNC bond angle is __________.sp3; <109.5°
The N-H bond in the ammonium ion, NH4+, is formed by the overlap of what two orbitals?sp3-s
Among the hydrogen halides, the strongest bond is found in __________ and the longest bond is found in __________.HF; HI
The carbon- carbon double bond in ethene is __________ and __________ than the carbon-carbon triple bond in ethyne.weaker; longer
Draw the structure of a molecule which contains only carbon and hydrogen atoms (only three of which are carbon) and in which two of the carbons are sp2 hybridized and the other is sp hybridized.H2CCCH2
Why is the C H bond in ethene (H2CCH2) shorter and stronger than the C H bond in ethane(H3C-CH3)?The length and strength of a C H bond depends on the hybridization of the carbon atom. The more s character in the hybrid orbital used by carbon to form the bond, the shorter and stronger the bond. This is because an s orbital is closer to the nucleus than is a p orbital. Ethene uses carbon sp2 hybridized orbitals (1/3 s character) to make its carbon-hydrogen bonds while ethane uses carbon sp3 (1/4 s character) orbitals.