Remedial Test Flashcards
An atom of the most common isotope of gold 197Au, has ___ protons, ___ neutrons, and ___ electrons.
79, 118, 79
There are ___ electrons, ___ protons, and ___ neutrons in an atom of 123/54 Xe.
132, 132, 54
Which pair of atoms constitutes a pair of isotopes of the same element?
14/6 x 12/6 x
All atoms of a given element have the same ___.
Number of protons.
The ground state electron configuration of Ga is ___
1s22s22p64s23d10,4p1.
The ground state electron configuration of the element ___ is [Kr] 5s1,4d5
Cr
The ground state electron configuration of the element [Ar] 4s1,3d5
Fe
Which of the following elements has ground state electron configuration different from the predicted one?
Xe
There are ___ orbitals in the second shell.
4
Which of the following has eight valence electrons?
All of the above (Kr, Ti, Cl, Na)
Of the molecules below, the bond in ___ is the most polar.
All of the above (Hbr, HI, HCl, HF)
The Lewis structure of N2H2 shows ___
Each nitrogen has two nonbonding electronic pairs.
The type of bonding where electrons are transferred to another element and ions are formed.
Ionic bonding.
There are ___ paired and ___ unpaired electrons in the Lewis symbol for a fluorine atom.
4, 1
The basis of the VSEPR model of molecular bonding is ___.
Electron domains in the valence shell of an atom will arrange themselves so as to minimize repulsion.
What is the bond angle of NH4+
109.5 dg
Which of the following molecules has 120 dg as its bonding angle?
NH2-
What is the molecular shape of H20?
Bent
For a molecule with the formula AB2, the molecular shape is ___
Trigonal planar
The molecular geometry of the PF3 molecule is ___ and this molecule is ___.
Trigonal planar, polar
The Cl-Si-Cl bond angle in the SiClF2 molecule is approximately ___
109.5 dg
Which species has London dispersion forces as the only intermolecular force?
CH3CH3
When the KBr dissolves in water, aqueous K= and Br- ions result. The force of attraction that exists between K+ and H2O is called ___ interaction
Ion- dipole
Hydrogen bonding is a special case of ?
London Dispersion forces
An unsaturated solution is one that ___.
Has a concentration lower than the solubility limit.
Molarity is defined as the ___.
mol solute/liters solution
A solution contains 11% by mass of sodium chloride. This means that ___.
100 mL of the solution contains 11g of sodium chloride.
According to the Arrhenius concept, an acid is a substance that ___.
Is capable of donating one or more H+.
An aqueous solution of a particular compound has pH 8.16. The compound is ___
a salt.
What is the conjugate acid of NH2-?
NH3
The conjugate acid of HPO4 2- is?
H2PO4
Of the reactions involved in the photodecomposition of ozone shown below which are photochemical?
1, 3
Why are chlorofluorocarbons so damaging to the ozone layer when they are such stable molecules?
The radiation in the stratosphere dissociates them producing chlorine atoms that catalytically destroy ozone.
