Question 1

Which is the electron dot structure for nitrogen,N₂?

Accepted Answer

A)    
B)    
C)    
D)    
A)    
B)    
C)    
D)

Question 2

The formula of sodium chromate is

Accepted Answer

A) NaCrO₄. 
B) Na₂Cr. 
C) Na₂CrO₄. 
D) Na₃(CrO₄)₂. 
A) NaCrO₄. 
B) Na₂Cr. 
C) Na₂CrO₄. 
D) Na₃(CrO₄)₂.

Question 3

Which of the following is a polyatomic ion?

Accepted Answer

A) HCN 
B) Na⁺ 
C) H₂ 
D) SO₄²⁻ 
A) HCN 
B) Na⁺ 
C) H₂ 
D) SO₄²⁻

Question 4

Which of the following statements about molecules is correct?

Accepted Answer

A) A compound that contains only nonpolar bonds can be polar. 
B) A compound that contains only polar bonds can be nonpolar. 
C) A compound that contains only polar bonds must be polar. 
D) A compound that contains both polar and nonpolar bonds must be nonpolar. 
A) A compound that contains only nonpolar bonds can be polar. 
B) A compound that contains only polar bonds can be nonpolar. 
C) A compound that contains only polar bonds must be polar. 
D) A compound that contains both polar and nonpolar bonds must be nonpolar.

Question 5

In a molecule of nitrogen,N₂,the nitrogen atoms are bonded to each other by

Accepted Answer

A) an ionic bond. 
B) a single covalent bond. 
C) a double covalent bond. 
D) a triple covalent bond. 
A) an ionic bond. 
B) a single covalent bond. 
C) a double covalent bond. 
D) a triple covalent bond.

Question 6

Which pair of atoms would form an ionic bond?

Accepted Answer

A) Na and Mg 
B) Ca and S 
C) Cl and Br 
D) N and N 
A) Na and Mg 
B) Ca and S 
C) Cl and Br 
D) N and N

Question 7

Which substance has polar covalent bonds?

Accepted Answer

A) Rn 
B) NH₃ 
C) F₂ 
D) Ca₂C 
A) Rn 
B) NH₃ 
C) F₂ 
D) Ca₂C

Question 8

The electron dot formula for carbon monoxide,CO,is

Accepted Answer

A)    
B)    
C)    
D)    
A)    
B)    
C)    
D)

Question 9

The common name of the compound with the formula NH₃ is

Accepted Answer

A) ammonia. 
B) vinegar. 
C) methane. 
D) alcohol. 
A) ammonia. 
B) vinegar. 
C) methane. 
D) alcohol.

Question 10

Which one of the following compounds does NOT obey the "octet rule"?

Accepted Answer

A) H₂O 
B) CBr₄ 
C) LiF 
D) BF₃ 
A) H₂O 
B) CBr₄ 
C) LiF 
D) BF₃

Question 11

Write the electron dot symbol for selenium.

Accepted Answer

The electron dot symbol, also known as t

Question 12

In the formula for ammonium nitrate,the number of nitrogen atoms is

Accepted Answer

A) one. 
B) two. 
C) three. 
D) four. 
A) one. 
B) two. 
C) three. 
D) four.

Question 13

The number of protons in a chloride ion,Cl⁻,is

Accepted Answer

A) 16. 
B) 17. 
C) 18. 
D) 35. 
A) 16. 
B) 17. 
C) 18. 
D) 35.

Question 14

The best description of the shape of an ammonia molecule is

Accepted Answer

A) linear. 
B) bent. 
C) trigonal pyramidal. 
D) tetrahedral. 
A) linear. 
B) bent. 
C) trigonal pyramidal. 
D) tetrahedral.

Question 15

Which of the following elements can form four bonds with other atoms?

Accepted Answer

A) S 
B) Br 
C) Si 
D) P 
A) S 
B) Br 
C) Si 
D) P

Question 16

When sodium and chlorine react to form sodium chloride,sodium and chlorine ________ are changed into sodium and chloride ________.

Accepted Answer

The answer of When sodium and chlorine react to form...

Question 17

Which is the electron dot structure of sulfur?

Accepted Answer

A)    
B)    
C)    
D) 2   
A)    
B)    
C)    
D) 2

Question 18

The number of protons in a cation must always be ________ the number of electrons.

Accepted Answer

The answer of The number of protons in a cation...

Question 19

The formula of aluminum oxide is

Accepted Answer

A) AlO. 
B) AlO₂. 
C) AlO₃. 
D) Al₂O₃. 
A) AlO. 
B) AlO₂. 
C) AlO₃. 
D) Al₂O₃.

Question 20

Which of the following molecules is NOT likely to exist?

Accepted Answer

A) CO₂ 
B) HCl 
C) CCl₄ 
D) RnH 
A) CO₂ 
B) HCl 
C) CCl₄ 
D) RnH

Exam 4: Chemical Bonds

Which is the electron dot structure for nitrogen,N₂?

The formula of sodium chromate is

Which of the following is a polyatomic ion?

Which of the following statements about molecules is correct?

In a molecule of nitrogen,N₂,the nitrogen atoms are bonded to each other by

Which pair of atoms would form an ionic bond?

Which substance has polar covalent bonds?

The electron dot formula for carbon monoxide,CO,is

The common name of the compound with the formula NH₃ is

Which one of the following compounds does NOT obey the "octet rule"?

Write the electron dot symbol for selenium.

In the formula for ammonium nitrate,the number of nitrogen atoms is

The number of protons in a chloride ion,Cl⁻,is

The best description of the shape of an ammonia molecule is

Which of the following elements can form four bonds with other atoms?

When sodium and chlorine react to form sodium chloride,sodium and chlorine ________ are changed into sodium and chloride ________.

Which is the electron dot structure of sulfur?

The number of protons in a cation must always be ________ the number of electrons.

The formula of aluminum oxide is

Which of the following molecules is NOT likely to exist?

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When sodium and chlorine react to form sodium chloride,sodium and chlorine are changed into sodium and chloride .