Worksheet –Molecular Substances 2
Work sheet (2) Chapter (5,9) Section (5.2,9.1)
Subject
Name
Date
Grade
10 Core
Chemistry
Cluster
I-Choose the best answer.
1- When electrons are shared unequally, chemists characterize these types of bonds as ______________.
A.
B.
C.
D.
polar covalent
unbalanced
ionic
pure covalent
2A.
B.
C.
D.
Atoms with greatly differing electronegativity values are expected to form
nonpolar covalent bonds
no bonds
ionic bonds
polar covalent bonds
3- Metals typically have ______________ electronegativity values.
A. high
B. no
C. negative
D. low
4. Nonmetal elements typically have ______________ electronegativities.
A. low
B. neutral
C. high
D. strong
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5. Carbon dioxide has ______________ bonds.
A.
B.
C.
D.
ionic
magnetic
polar covalent
covalent
6. Which of the following compounds contains an ionic bond?
A. NaCl
B. O2
C. CCl4
D. SO2
7. In the hydrogen chloride molecule, the atoms are held together by a(n)
A. polar covalent bond
B. double bond
C. nonpolar bond
D. ionic bond
8. Which of the following elements has the lowest electronegativity?
A. Cl
B. Rb
C. Ca
D. Na
9. If atom X forms a diatomic molecule with itself, the bond is
A. ionic
B. nonpolar covalent
C. polar covalent
D. polar coordinate covalent
10. One of the most important characteristics of the water molecule is its ______________, which allows it
to surround and attract both positive and negative ions.
A. fluidity
B. polarity
C. stability
D. strength
11. A bond formed between two atoms with an electronegativity difference of 0.7 is likely to be :
A. Polar covalent bond
B. Nonpolar covalent bond
C. Ionic bond
D. Covalent bond
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12. Hydrocarbons are most commonly used as
A. Acids
B. Bases
C. Fuels
D. Explosives
II- Answer the following questions:
The line in below represents the range of differences in electronegativity ∆EN that are possible
between any two elements in the periodic table. The smallest difference is represented by the
left end of the line, and the greatest difference by the right end of the line. In the space provided,
write the letter of the labeled parts from this line that corresponds to the descriptions. Some of
the letters may be used more than once.
Description
Corresponding letter(s)
The lowest possible value of ∆EN
The bond of greatest possible ionic
character
A pure nonpolar covalent bond
A polar covalent bond
An ionic bond that would form between
calcium and oxygen
The bond in a diatomic molecule of an
element
A bond that is classified as nonpolar but
that has a slight polarity
The division between nonpolar covalent
and polar covalent bonds
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