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Physical Science > Polarity > Flashcards

Polarity Flashcards

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1
Q

Which of the following terms refer to the ability of an atom in a molecule to attract shared electrons?

A

Electronegativity

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2
Q

Which is TRUE about polar bonds?

A

They may result in nonpolar covalent compounds depending on molecular geometry.

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3
Q

What type of chemical bond holds the atoms of water molecule together?

A

Polar covalent bond

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4
Q

Which of the following molecule is nonpolar?
a. NaCl
b. HCl
c. CO2
d. NH3

A

c. CO2

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5
Q

Which of the two pairs has the lowest electronegativity difference value?
a. C-O
b. H-N
c. S-F
d. Na-Cl

A

d. Na-Cl

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6
Q

What is the type of chemical bond present in a hypothetical molecule which has an electronegativity difference of 0.5?

A

Polar covalent

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7
Q

What is the molecular shape of BeF3?

A

Trigonal

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8
Q

A molecule can have a polar bond and still be nonpolar overall. The statement is?

A

a. True

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9
Q

A polar covalent bond would form in which of the following pairs of atoms?

A

c. N-H

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10
Q

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.

A

The first and second statements are true

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11
Q

The general trend of electronegativity as you move from top to bottom
of the periodic table is increasing.

A

False

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12
Q

Fluorine has the greatest electronegativity while cesium and francium have the least electronegativity value.

A

False

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13
Q

Water, with a bent molecular shape, is classified as a polar molecule

A

True

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14
Q

Water, with a bent molecular shape, is classified as a polar molecule

A

True

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15
Q

Hydrogen cyanide (HCN) exhibits a linear geometry

A

True

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16
Q

polar covalent bond

A

is formed when electrons are shared unequally
by two atoms in a compound.

17
Q

electric dipole

A

bonded pair of atoms
Dipole means “two poles” which means that a molecule
has one positive end and one negative end.

18
Q

nonpolar covalent bond

A

develops if both atoms equally share a pair of electrons between them.

19
Q

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

A

c. II and III only

20
Q

Which of the following intermolecular forces of attraction (IMFA) is arranged from strongest to weakest?

A

a. H- bonding – dipole-dipole – London forces

21
Q

Which among the choices refers to the resistance of a liquid to flow?

A

viscosity

22
Q

What term refers to the temperature at which the liquid starts to boil

A

boiling point

23
Q

The pressure exerted by a substance when in its gaseous state is known as what?

A

vapor pressure

24
Q

What is the ability of a substance to be dissolved in another substance to form a solution?

A

solubility

25
Q

Viscosity is defined as the resistance of a substance to flow. Which following
is NOT an example of a viscous substance?

A

vinegar

26
Q

Which of the following is NOT TRUE about water? It _____

A

a. becomes denser when freezes

27
Q

Miscibility is the ability of a substance to mix with another substance. Which of the following substances will most likely be miscible in water?

A

ethyl alcohol (C2H6O)

28
Q

Which of the following will dissolve in polar solvents?

A

a. ionic compounds and polar covalent compounds

29
Q

The floating of ice on liquid water is an indication that ice has higher density than liquid water.

A

False

30
Q

The volatility of a substance depends on its vapor pressure.

A

True

31
Q

Alcohol is less volatile than vinegar.

A

False

32
Q

Between water (H2O) and carbon tetrachloride (CCl4), water has higher boiling point.

A

True

Physical Science (4 decks)

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