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Question 7 of 9

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SAT Subject Test

Each of the following questions consists of two statements, I in the left-hand column and II in the right-hand column. For each question, determine whether statement I is true or false and whether statement II is true or false. Select the appropriate answer combination from the choices below. Choices with a filled CE oval denote that statement II is a correct explanation of the true statement I.

A molecule of silicon tetrachloride, text SiCl end text subscript 4 end subscript, is nonpolar
BECAUSE
the four bonds in text SiCl end text subscript 4 end subscript are identical and the molecule has a tetrahedral structure.

Select an Answer

The figure shows a sample answer grid for question number one hundred one. Option (A) shows the sample answer grid that has a true and a false bubble option for the Roman numeral I statement, a true and false bubble option for the Roman numeral II statement, and a single bubble option for C E. For the Roman numeral I statement the true bubble is filled in, for the Roman numeral II statement the true bubble is filled in, and the C E bubble is filled in.

Correct Answer: 
Yes

The figure shows a sample answer grid for question number one hundred one. Option (B) shows the sample answer grid that has a true and false bubble option for the Roman numeral I statement, a true and false bubble option for the Roman numeral II statement, and a single bubble option for C E. For the Roman numeral I statement the true bubble is filled in, for the Roman numeral II statement the true bubble is filled in, and the C E bubble is NOT filled in.

Correct Answer: 
No

The figure shows a sample answer grid for question number one hundred one. Option (C) shows the sample answer grid that has a true and false bubble option for the Roman numeral I statement, a true and false bubble option for the Roman numeral II statement, and a single bubble option for C E. For the Roman numeral I statement the true bubble is filled in, for the Roman numeral II statement the false bubble is filled in, and the C E bubble is NOT filled in.

Correct Answer: 
No

The figure shows a sample answer grid for question number one hundred one. Option (D) shows the sample answer grid that has a true and false bubble option for the Roman numeral I statement, a true and false bubble option for the Roman numeral II statement, and a single bubble option for C E. For the Roman numeral I statement the false bubble is filled in, for the Roman numeral II statement the true bubble is filled in, and the C E bubble is NOT filled in.

Correct Answer: 
No

The figure shows a sample answer grid for question number one hundred one. Option (E) shows the sample answer grid that has a true and false bubble option for the Roman numeral I statement, a true and false bubble option for the Roman numeral II statement, and a single bubble option for C E. For the Roman numeral I statement the false bubble is filled in, for the Roman numeral II statement the false bubble is filled in, and the C E bubble is NOT filled in.

Correct Answer: 
No

The correct answer is T, T, CE.

Silicon has four valence electrons. In text SiCl end text subscript 4 end subscript, the four chlorine atoms are arranged around the central silicon atom. The four bonds are polar, since text Si end text and text Cl end text have different electronegativities, but they are identical. The arrangement of electron pairs that best minimizes the repulsion is a tetrahedral arrangement. There are four dipoles in the molecule but, because of the molecule's symmetry, they cancel each other and the molecule is therefore nonpolar. Both statement text I end text and statement text II end text are true. Because the bonds are identical and the molecule is tetrahedral, the molecule is nonpolar (i.e., statement text II end text is a correct explanation of statement text I end text).

Question Difficulty: 
hard