Chemistry: Study Guide

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* Question 1
10 out of 10 points
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 | According to VSEPR theory, which one of the following molecules should have a bent  shape?Answer| | | |
| Selected Answer:|   Cl2O|
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* Question 2
10 out of 10 points
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 | According to the VSEPR theory, the molecular shape of SiCl4 isAnswer| | | | | Selected Answer:|   tetrahedral.|
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* Question 3
10 out of 10 points
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 | According to the VSEPR theory, the shape of the SO3 molecule isAnswer| | | | | Selected Answer:| trigonal planar.  |
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* Question 4
10 out of 10 points
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 | Balance the following equation using the smallest set of whole numbers, then add together the coefficients. Don't forget to count coefficients of one.

___ Al + ___ H2SO4 → ___ Al2(SO4)3 + ___ H2

The sum of the coefficients isAnswer| | | |
| Selected Answer:|   9.|
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* Question 5
10 out of 10 points
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 | Consider the species Cl2+, Cl2, and Cl2−. Which of these species will be paramagnetic?Answer| | | | | Selected Answer:|   Cl2+ and Cl2−|
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* Question 6
10 out of 10 points
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 | How many O atoms are there in 51.4 g CaSO4?Answer| | | | | Selected Answer:|   9.09 × 1023|
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* Question 7
10 out of 10 points
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 | How many covalent bonds will a nitrogen atom usually form?Answer| | | | | Selected Answer:|   3|
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* Question 8
10 out of 10 points
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 | How many grams of Cl2 can be prepared from the reaction of 16.0 g of MnO2 and 30.0 g of HCl according to the following chemical equation?

MnO2 + 4HCl → MnCl2 + Cl2 + 2H2OAnswer| | | |
| Selected Answer:|   13.0G|
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* Question 9
10 out of 10 points
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 | How many grams of sodium are there in 10. g of sodium sulfate, Na2SO4?Answer| | | | | Selected Answer:| 3.2|
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* Question 10
10 out of 10 points
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 | In which of the following would the bonding be weakened with the addition of an electron to form the negative molecular ion?Answer| | | | | Selected Answer:|   N2|
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* Question 11
0 out of 10 points
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 | In which of these pairs of atoms would the bond have the greatest percent ionic character (i.e., most polar)?Answer| | | | | Selected Answer:| c-o  s-o f--f|
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* Question 12
10 out of 10 points
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 | Indicate the type of hybrid orbitals used by the central atom in PCl3.Answer| | | | | Selected Answer:|   sp3|
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uestion 13
10 out of 10 points
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 | The F−S−F bond angles in SF6 areAnswer| | | | | Selected Answer:|   90° and 180°.|
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* Question 14
10 out of 10 points
| |
 | The Lewis dot symbol for the a lead atom isAnswer| | | | | Selected Answer:|   |
Not A| | | |
* Question 15
10 out of 10 points
| |
 | The Lewis structure for CS2 is:Answer| | | |
| Selected Answer:|   |
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* Question 16
10 out of 10 points
| |
 | The number of pi bonds in the molecule below is
      Answer| | | |
| Selected Answer:|   3|
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* Question 17
10 out of 10 points
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 | The number of resonance structures for the nitrate ion that satisfies the octet rule isAnswer| | | | | Selected Answer:| 3|
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Question 18 Question 18
10 out of 10 points
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 | The shape of the CS2 molecule is best described asAnswer| | | | | Selected Answer:|   linear.|
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* Question 19
0 out of 10 points
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 | What is the formal charge on sulfur in the best Lewis structure for the SCN− (thiocyanate) ion?Answer| | | | | Selected Answer:|   −1 +2 -2+1|
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* Question 20
10 out of 10 points
| |
 | What type of chemical bond holds the atoms together within a water molecule?Answer| | | | | Selected...
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