Title: Exam 2-Fall 2016
Course: DOL Grant Introduction to Chemistry

Q: A cheeseburger from a fast food restaurant contains 19 g of fat, 20 g of carbohydrate, and 28 g of protein. How many kcal of energy does the cheeseburger contain? (The caloric values are: 4 kcal/g for carbohydrate, 9 kcal/g for fat, and 4 kcal/g for protein.) Give the answer to 2 significant figures.
- 70. kcal
- 360 kcal
- 17 kcal
- 630 kcal
- 280 kcal
A: 360 kcal

Q: A patient has a temperature of 38.5 °C. What is the temperature in degrees Fahrenheit?
- 70.5 °F
- 311 °F
- 126.9 °F
- 101.3 °F
- 11.7 °F
A: 101.3 °F

Q: Air is a heterogeneous mixture.
- True
- False
A: False

Q: An example of kinetic energy is ________.
- a coiled spring
- running water
- a tree
- natural gas
- food
A: running water

Q: As a solid melts, its temperature does not change.
- True
- False
A: True

Q: A sodium atom with a mass number of 23 has 23 neutrons.
- True
- False
A: False

Q: How many protons are in an isotope of sodium with a mass number of 25?
- 11
- 14
- 15
- 25
- 32
A: 11

Q: How many calories are required to raise the temperature of a 35.0 g sample of iron from 25 °C to 35 °C? Iron has a specific heat of 0.108 cal/g °C.
- 38 cal
- 1.1 cal
- 3.8 cal
- 93 cal
- 130 cal
A: 38 cal

Q: Ice melting is a chemical change.
- True
- False
A: False

Q: How many valence electrons are in the electron-dot symbols for the elements in group 3A (13)?
- 1
- 2
- 3
- 4
- 6
A: 3

Q: Identify the noble gas in the following list.
- helium
- nitrogen
- oxygen
- gold
- chlorine
A: helium

Q: Identify the metalloid in the following list.
- sulfur
- fluorine
- silver
- copper
- germanium
A: germanium

Q: If the heat of fusion for water is 80. cal/g, how many calories are needed to melt 45.0 g of ice at 0 °C?
- 3.6 cal
- 3.6 × 10<sup>3</sup> cal
- 1.8 cal
- 80. cal
- 0.56 cal
A: 3.6 × 10<sup>3</sup> cal

Q: If the temperature is -55 °F, what is the corresponding temperature on the Kelvin scale?
- 225 K
- 218 K
- 55 K
- 273 K
- 328 K
A: 225 K

Q: In a gas, the distance between the particles is ________.
- very close relative to the size of the molecules
- close relative to the size of the molecules
- fixed relative to the size of the molecules
- small relative to the size of the molecules
- very large relative to the size of the molecules
A: very large relative to the size of the molecules

Q: Ionization energy increases going down a group.
- True
- False
A: False

Q: Iron rusting is a chemical change.
- True
- False
A: True

Q: On a heating curve a plateau corresponds to ________.
- a change in temperature of a liquid
- a change in temperature of a solid
- a change in temperature of a gas
- a change of state
- the solid being broken into smaller pieces
A: a change of state

Q: Raising the temperature of 10.0 g of water from 10.0 °C to 20.0 °C requires 100.0 cal of energy, while raising the temperature of 10.0 g of aluminum from 10.0 °C to 20.0 °C requires 22.0 cal. More calories are required to heat the water because ________.
- water is a liquid and aluminum is a solid at 10.0 °C
- ten grams of water occupies a larger volume than 10.0 g of aluminum
- water has a greater potential energy than aluminum
- water has a larger specific heat than aluminum
- 10.0 °C is closer to the melting point of water than to the melting point of aluminum
A: water has a larger specific heat than aluminum

Q: Sulfur has 16 valence electrons.
- True
- False
A: False

Q: The atomic number of sodium is 23.
- True
- False
A: False

Q: The correct symbol for the isotope of potassium with 22 neutrons is ________.
- <img align="middle" src="ppg/pearson/tm/ichem12t/f12g1q43g1.gif"/>K
- <img align="middle" src="ppg/pearson/tm/ichem12t/f12g1q43g2.gif"/>K
- <img align="middle" src="ppg/pearson/tm/ichem12t/f12g1q43g3.gif"/>P
- <img align="middle" src="ppg/pearson/tm/ichem12t/f12g1q43g4.gif"/>P
- <img align="middle" src="ppg/pearson/tm/ichem12t/f12g1q43g5.gif"/>K
A: <img align="middle" src="ppg/pearson/tm/ichem12t/f12g1q43g1.gif"/>K

Q: The elements lithium, sodium, and potassium ________.
- are isotopes of each other
- are in the same period of elements
- have the same number of neutrons
- are in the same group
- have the same mass number
A: are in the same group

Q: The maximum number of electrons that may occupy the third electron energy level is ________.
- 2
- 8
- 10
- 18
- 32
A: 18

Q: The phrase "ability to do work" is a definition of ________.
- specific heat
- energy
- calorie
- heating
- cooling
A: energy

Q: The proton is 2000 times the mass of the neutron.
- True
- False
A: False

Q: The temperature at which water melts and freezes is the same.
- True
- False
A: True

Q: What element has the electron arrangement 2,8,4?
- carbon
- oxygen
- sulfur
- iron
- silicon
A: silicon

Q: What elements are in hydroxyapatite, Ca<sub>5</sub>(PO<sub>4</sub>)<sub>3</sub>OH, a major compound in human bones and teeth?
- carbon, potassium, oxygen, hydrogen
- calcium, phosphorous, oxygen, hydrogen
- carbon, phosphorous, oxygen, helium
- calcium, phosphorous, oxygen, helium
- carbon, potassium, oxygen, helium
A: calcium, phosphorous, oxygen, hydrogen

Q: What is the symbol of the element in Group 4A (14) and Period 2?
- Be
- Mg
- Ca
- C
- Si
A: C

Q: When a solid is converted directly to a gas, the change of state is called ________.
- freezing
- melting
- boiling
- condensation
- sublimation
A: sublimation

Q: Which element would have physical and chemical properties similar to chlorine?
- Ar
- Br
- S
- O
- P
A: Br

Q: Which of the following elements is a noble gas?
- oxygen
- chlorine
- bromine
- argon
- nitrogen
A: argon

Q: Which of the following is a characteristic of nonmetals?
- shiny
- malleable
- good conductors of heat
- low melting points
- good conductors of electricity
A: low melting points

Q: Which of the following is a characteristic of the modern periodic table?
- A group is a horizontal row on the periodic table.
- A period is a column on the periodic table.
- The elements in each group have similar chemical properties.
- The B groups contain the representative elements.
- The A groups contain the transition elements.
A: The elements in each group have similar chemical properties.

Q: Which of the following is a chemical change?
- burning natural gas
- melting ice
- hammering gold into foil
- cutting a tomato
- cutting paper
A: burning natural gas

Q: Which of the following is an example of a physical change?
- grinding coffee beans
- baking a cake
- converting water to hydrogen and oxygen
- digesting a cheeseburger
- burning coal
A: grinding coffee beans

Q: Which of the following is not true for the atoms<sup> 13</sup>N, <sup>14</sup>N, and <sup>15</sup>N?
- They all have the same mass number.
- They are isotopes.
- They all have the same atomic number.
- They all have 7 protons.
- They all have 7 electrons.
A: They all have the same mass number.

Q: A sample of chlorine has two naturally occurring isotopes. The isotope Cl-35 makes up 75.8% of the sample, and the isotope Cl-37 makes up 24.3% of the sample. Which of the following statements is true?
- The atomic mass of chlorine will be less than 35.
- The atomic mass of chlorine will be more than 37.
- You cannot tell what the atomic mass will be.
- The atomic mass will be between 35 and 37.
- The atomic mass will be 24.3.
A: The atomic mass will be between 35 and 37.

Q: What is the element with the electron arrangement 2,8,7?
- Be
- Cl
- F
- S
- Ar
A: Cl