Polarity Flashcards
Which of the following terms refer to the ability of an atom in a molecule to attract shared electrons?
Electronegativity
Which is TRUE about polar bonds?
They may result in nonpolar covalent compounds depending on molecular geometry.
What type of chemical bond holds the atoms of water molecule together?
Polar covalent bond
Which of the following molecule is nonpolar?
a. NaCl
b. HCl
c. CO2
d. NH3
c. CO2
Which of the two pairs has the lowest electronegativity difference value?
a. C-O
b. H-N
c. S-F
d. Na-Cl
d. Na-Cl
What is the type of chemical bond present in a hypothetical molecule which has an electronegativity difference of 0.5?
Polar covalent
What is the molecular shape of BeF3?
Trigonal
A molecule can have a polar bond and still be nonpolar overall. The statement is?
a. True
A polar covalent bond would form in which of the following pairs of atoms?
c. N-H
A molecule shape is a three-dimensional arrangement of atoms or bonding
groups around a central atom. The molecular shape is governed by the valence shell electron repulsion (VSEPR) theory.
The first and second statements are true
The general trend of electronegativity as you move from top to bottom
of the periodic table is increasing.
False
Fluorine has the greatest electronegativity while cesium and francium have the least electronegativity value.
False
Water, with a bent molecular shape, is classified as a polar molecule
True
Water, with a bent molecular shape, is classified as a polar molecule
True
Hydrogen cyanide (HCN) exhibits a linear geometry
True
polar covalent bond
is formed when electrons are shared unequally
by two atoms in a compound.
electric dipole
bonded pair of atoms
Dipole means “two poles” which means that a molecule
has one positive end and one negative end.
nonpolar covalent bond
develops if both atoms equally share a pair of electrons between them.
Which of the following is TRUE of polar molecules?
i. Have high boiling point iii. low surface tension
ii. Have high melting point iv. High vapor pressure
c. II and III only
Which of the following intermolecular forces of attraction (IMFA) is arranged from strongest to weakest?
a. H- bonding – dipole-dipole – London forces
Which among the choices refers to the resistance of a liquid to flow?
viscosity
What term refers to the temperature at which the liquid starts to boil
boiling point
The pressure exerted by a substance when in its gaseous state is known as what?
vapor pressure
What is the ability of a substance to be dissolved in another substance to form a solution?
solubility
Viscosity is defined as the resistance of a substance to flow. Which following
is NOT an example of a viscous substance?
vinegar
Which of the following is NOT TRUE about water? It _____
a. becomes denser when freezes
Miscibility is the ability of a substance to mix with another substance. Which of the following substances will most likely be miscible in water?
ethyl alcohol (C2H6O)
Which of the following will dissolve in polar solvents?
a. ionic compounds and polar covalent compounds
The floating of ice on liquid water is an indication that ice has higher density than liquid water.
False
The volatility of a substance depends on its vapor pressure.
True
Alcohol is less volatile than vinegar.
False
Between water (H2O) and carbon tetrachloride (CCl4), water has higher boiling point.
True
