Title: Exam 4-Fall 2016
Course: DOL Grant Introduction to Chemistry

Q: A hydrogen bond is ________.
- an attractive force between molecules where partially positive hydrogen atoms are attracted to partially negative atoms of F,O, or N
- a covalent bond between H and O
- an ionic bond between H and another atom
- a bond that is stronger than a covalent bond
- the polar O<img align="middle" height="17" width="11" src="ppg/pearson/tm/ichem12t/u57348.gif"/>H bond in water
A: an attractive force between molecules where partially positive hydrogen atoms are attracted to partially negative atoms of F,O, or N

Q: The O-H bond in water is polar because ________.
- it is an ionic bond
- oxygen is much more electronegative than hydrogen
- oxygen occupies more space than hydrogen
- hydrogen is much more electronegative than oxygen
- it is a hydrogen bond
A: oxygen is much more electronegative than hydrogen

Q: Which of the following molecules can form hydrogen bonds?
- CH<sub>4</sub>
- NaH
- NH<sub>3</sub>
- BH<sub>3</sub>
- HI
A: NH<sub>3</sub>

Q: 0.400 mole of sucrose, C<sub>12</sub>H<sub>22</sub>O<sub>11</sub>, contains ________ C atoms.
- 12
- 6.02 × 10<sup>23</sup>
- 5.02 × 10<sup>22</sup>
- 2.89 × 10<sup>24</sup>
- 4.80
A: 2.89 × 10<sup>24</sup>

Q: A chemical equation is balanced when ________.
- the total number of molecules is the same in reactants and products
- the total number of ions is the same in reactants and products
- the sum of the coefficients of the reactants is equal to the sum of the coefficients of the products
- the number of atoms of each element is the same in reactants and products
- the charge on each atom is the same in reactants and products
A: the number of atoms of each element is the same in reactants and products

Q: 4.00 moles of sodium have a mass of ________.
- 4.60 g
- 11.0 g
- 23.0 g
- 44.0 g
- 92.0 g
A: 92.0 g

Q: Avogadro's number is the number of grams in a mole.
- True
- False
A: False

Q: Calculate the molar mass of magnesium chloride, MgCl<sub>2</sub>.
- 24.31 g/mole
- 95.21 g/mole
- 125.9 g/mole
- 59.76 g/mole
- 70.90 g/mole
A: 95.21 g/mole

Q: For the following reaction, what is the correct coefficient for the H<sub>2</sub>?<br/><img align="bottom" src="ppg/pearson/tm/ichem12t/f24g1q38g1.gif"/>
- 1
- 2
- 3
- 4
- 5
A: 3

Q: Given the following equation, what is the correct form of the conversion factor needed to convert the number of moles of O<sub>2</sub> to the number of moles of Fe<sub>2</sub>O<sub>3</sub> produced?<br/><br/><img align="bottom" src="ppg/pearson/tm/ichem12t/f24g1q50g1.gif"/><br/>
- <img align="middle" src="ppg/pearson/tm/ichem12t/f24g1q50g2.gif"/><br/>
- <img align="middle" src="ppg/pearson/tm/ichem12t/f24g1q50g3.gif"/><br/>
- <img align="middle" src="ppg/pearson/tm/ichem12t/f24g1q50g4.gif"/><br/>
- <img align="middle" src="ppg/pearson/tm/ichem12t/f24g1q50g5.gif"/><br/>
- <img align="middle" src="ppg/pearson/tm/ichem12t/f24g1q50g6.gif"/><br/>
A: <img align="middle" src="ppg/pearson/tm/ichem12t/f24g1q50g6.gif"/><br/>

Q: How many grams of Fe<sub>2</sub>O<sub>3</sub> are there in 0.500 mole of Fe<sub>2</sub>O<sub>3</sub>?
- 79.9 g
- 35.9 g
- 63.8 g
- 51.9 g
- 160. g
A: 79.9 g

Q: How many grams of glucose (C<sub>6</sub>H<sub>12</sub>O<sub>6</sub>) are in 3.55 moles of glucose?
- 180. g
- 640. g
- 103 g
- 426 g
- 50.7 g
A: 640. g

Q: In a ________ reaction, two or more elements or compounds form one product.
- decomposition
- single replacement
- combustion
- double replacement
- combination
A: combination

Q: In an oxidation-reduction reaction, the substance oxidized always ________.
- takes on oxygen atoms
- loses electrons
- gives up hydrogen atoms
- gains electrons
- becomes a charged species
A: loses electrons

Q: In any balanced chemical equation, the number of each type of atom on both sides of the equation is ________.
- doubled
- the same
- decreased by one
- increased by one
- dependent on the temperature
A: the same

Q: In the following reaction Al is oxidized.<br/>2Al + 3Br<sub>2</sub> <img align="middle" height="17" width="13" src="ppg/pearson/tm/ichem12t/u8594.gif"/> 2AlBr<sub>3</sub>
- True
- False
A: True

Q: In the following reaction C is reduced.<br/>2C + O<sub>2</sub> <img align="middle" height="17" width="13" src="ppg/pearson/tm/ichem12t/u8594.gif"/> 2CO
- True
- False
A: False

Q: In the following reaction, what is the correct coefficient for aluminum chloride?<br/><br/><img align="bottom" src="ppg/pearson/tm/ichem12t/f24g1q37g1.gif"/><br/>
- 1
- 2
- 3
- 4
- 5
A: 2

Q: In the reaction of hydrogen gas with oxygen gas to produce water, 1 mole of oxygen gas can produce 2 moles of water, given sufficient hydrogen available.
- True
- False
A: True

Q: In the reaction of nitrogen gas, N<sub>2</sub>, with hydrogen gas, H<sub>2</sub>, to form ammonia gas, NH<sub>3</sub>, how many moles of hydrogen are needed to react with two moles of nitrogen?<br/><br/><img align="bottom" src="ppg/pearson/tm/ichem12t/f24g1q56g1.gif"/> <br/>
- 2 moles
- 4 moles
- 6 moles
- 8 moles
- 5.710 moles
A: 6 moles

Q: One mole of copper(II) sulfate, CuSO<sub>4</sub>, contains ________ O atoms.
- 4
- 6.02 × 10<sup>23</sup>
- 1.51 × 10<sup>23</sup>
- 2.41 × 10<sup>23</sup>
- 2.41 × 10<sup>24</sup>
A: 2.41 × 10<sup>24</sup>

Q: <i>Pentane (<i>C</i><sub><i>5</i></sub><i>H</i><sub><i>12</i></sub>) reacts with oxygen (<i>O</i><sub><i>2</i></sub>) to form carbon dioxide (<i>CO</i><sub><i>2</i></sub>) and water (<i>H</i><sub><i>2</i></sub>O) according to the following reaction. Answer the following question(s) about this reaction.</i><br/><br/><img align="bottom" src="ppg/pearson/tm/ichem12t/f24g1q32g1.gif"/><br/><br/><br/>What is the coefficient for oxygen in the balanced equation?
- 2
- 4
- 5
- 6
- 8
A: 8

Q: The following is a double replacement reaction.<br/>2C<sub>2</sub>H<sub>2</sub> + 5O<sub>2</sub> <img align="middle" height="17" width="13" src="ppg/pearson/tm/ichem12t/u8594.gif"/> 4CO<sub>2</sub> + 2H<sub>2</sub>O
- True
- False
A: False

Q: The following is a decomposition reaction.<br/>2KClO<sub>3</sub> <img align="middle" height="17" width="13" src="ppg/pearson/tm/ichem12t/u8594.gif"/> 2KCl + 3O<sub>2</sub>
- True
- False
A: True

Q: The following reaction is correctly balanced.<br/>2C<sub>2</sub>H<sub>2</sub> + 5O<sub>2</sub> <img align="middle" height="17" width="13" src="ppg/pearson/tm/ichem12t/u8594.gif"/> 4CO<sub>2</sub> + 2H<sub>2</sub>O
- True
- False
A: True

Q: The following reaction is an example of a ________ reaction.<br/><br/><img align="bottom" src="ppg/pearson/tm/ichem12t/f24g1q41g1.gif"/><br/>
- combination
- single replacement
- combustion
- decomposition
- double replacement
A: combustion

Q: The molar mass of C<sub>3</sub>H<sub>8</sub>O<sub>2</sub> is ________.
- 76.09 g/mole
- 60.09 g/mole
- 29.02 g/mole
- 69.02 g/mole
- 52.01 g/mole
A: 76.09 g/mole

Q: The molar mass of copper(II) chloride is 134.5 g/mole.
- True
- False
A: True

Q: In this reaction, what is the correct coefficient for hydrogen gas?<br/><br/><img align="bottom" src="ppg/pearson/tm/ichem12t/f25g1q1g1.gif"/><br/>
- 1
- 2
- 3
- 4
- 5
A: 2

Q: <i>Answer the question(s) below about the following reaction.</i><br/><br/><img align="bottom" src="ppg/pearson/tm/ichem12t/f25g1q5g1.gif"/><br/><br/><br/>This is an example of a ________ reaction.
- combustion
- combination
- decomposition
- single replacement
- double replacement
A: decomposition

Q: 0.100 mole of lithium has a mass of ________.
- 3.00 g
- 0.300 g
- 6.94 g
- 0.694 g
- 0.700 g
A: 0.694 g

Q: <i>For the following question(s), consider the following balanced equation.<br/></i><br/><img align="bottom" src="ppg/pearson/tm/ichem12t/f24g1q53g1.gif"/><br/> <br/><br/>What is the correct form of the conversion factor needed to convert the number of moles of H<sub>2</sub>O to the number of moles of NH<sub>3</sub> produced?
- <img align="middle" src="ppg/pearson/tm/ichem12t/f24g1q53g2.gif"/><br/>
- <img align="middle" src="ppg/pearson/tm/ichem12t/f24g1q53g3.gif"/><br/>
- <img align="middle" src="ppg/pearson/tm/ichem12t/f24g1q53g4.gif"/><br/>
- <img align="middle" src="ppg/pearson/tm/ichem12t/f24g1q53g5.gif"/><br/>
- <img align="middle" src="ppg/pearson/tm/ichem12t/f24g1q53g6.gif"/> <br/>
A: <img align="middle" src="ppg/pearson/tm/ichem12t/f24g1q53g2.gif"/><br/>

Q: The strongest attractive forces between molecules of HBr are dipole-dipole attractions.
- True
- False
A: True

Q: The strongest attractive forces between molecules of NH<sub>3</sub> are hydrogen bonds.
- True
- False
A: True

Q: Chlorine is more electronegative than bromine.
- True
- False
A: True

Q: Double and triple bonds form because ________.
- the atoms involved have high electronegativities
- single covalent bonds do not give all of the atoms in the molecule eight valence electrons
- one of the atoms in the molecule has more than 8 valence electrons
- the ions involved have charges larger than one
- there is at least one hydrogen atom involved in the bond
A: single covalent bonds do not give all of the atoms in the molecule eight valence electrons

Q: Methane, (CH<sub>4</sub>), is a polar molecule.
- True
- False
A: False

Q: The molecule CO<sub>2</sub> is linear.
- True
- False
A: True

Q: The main type of attractive forces between molecules of hydrogen (H<sub>2</sub>) are ________.
- ionic bonds
- hydrogen bonds
- polar covalent
- dipole-dipole attractions
- dispersion forces
A: dispersion forces

Q: The molecule SCl<sub>2</sub> is linear.
- True
- False
A: False

Q: The shape of the water molecule (H<sub>2</sub>O) is ________.
- linear
- tetrahedral
- trigonal pyramidal
- bent
- trigonal planar
A: bent

Q: Which of the following substances contains a nonpolar covalent bond?
- H<sub>2</sub>O
- NaCl
- NH<sub>3</sub>
- MgF<sub>2</sub>
- N<sub>2</sub>
A: N<sub>2</sub>

Q: Which of the following elements does not exist as a diatomic molecule?
- hydrogen
- nitrogen
- chlorine
- oxygen
- carbon
A: carbon

Q: Find the mass of AlCl<sub>3</sub> that is produced when 25.0 grams of Al<sub>2</sub>O<sub>3</sub> reacts with HCl according to the following equation.<br/><br/><img align="bottom" src="ppg/pearson/tm/ichem12t/f24g1q63g1.gif"/><br/>
- 155 g
- 72.9 g
- 65.3 g
- 32.6 g
- 16.3 g
A: 65.3 g