Chemistry Test 2

A vertical column in the modern periodic table is called a
A) group
B) valence
C) branch
D) period

Elements in the same group have
A) the same number of valence electrons
B) the same number of electrons
C) the same number of neutrons
D) the same atomic number

Which element is a nonmetal?
A) chlorine
B) calcium
C) chromium
D) magnesium

Which element is in the same period as neon?
A) Na
B) Br
C) F
D) Ar

Which element is an alkaline earth metal?
A) Ar
B) F
C) Ba
D) Rb

Which element is a halogen?
A) F
B) Xe
C) Li
D) Ba

In which group do all atoms have one valence electron in the ground state?
A) alkali metals
B) alkaline earth metals
C) halogens
D) noble gases

In which group do all atoms have eight valence electrons in the ground state?
A) alkali metals
B) alkaline earth metals
C) halogens
D) noble gases

A metalloid
A) has properties intermediate between metals and nonmetals
B) is located on the left side of the periodic table
C) is in the center of the periodic table
D) is the same as a metal

Elements in the same group generally have
A) similar number of neutrons
B) different properties
C) similar properties
D) similar chemical symbols

The inertness of the noble gases is due to
A) the bonds they form with other elements
B) the outermost shell has six electrons
C) the number of protons and neutrons
D) the outermost shell has an octet of electrons, except for helium which has two electrons

A chloride ion, Cl- has the same electron configuration as a(n)
A) sodium atom
B) chlorine atom
C) argon atom
D) neon atom

The number of electrons in a sodium ion, Na+, is
A) 11
B) 10
C) 12
D) 23

When barium reacts with iodine, barium ions, Ba2+, and iodide ions, I-, are formed. In this reaction, iodine atoms
A) gain electrons
B) gain protons
C) lose electrons
D) loser protons

All of the following species are isoelectronic to Mg2+ EXCEPT
A) O2-
B) Li+
C) Ne
D) Na+

From the periodic table, the number of valence electrons for most of the main group elements may be determined directly from the
A) period number
B) group number
C) nucleon number
D) atomic number

Which is the electron dot structure of sulfur?
A) 4 dots on all sides of S
B) 2 dots on both sides of S as well as a 2 on the left
C) 2 dots on both sides of S as well as 1 dot below
D) 2 dots on both sides of S as well as 1 dot above and below

The attraction between positive and negative ions is known as a(n)
A) ionic bond
B) molecular bond
C) covalent bond
D) crystal bond

Which pair of atoms would form an ionic bond?
A) N and N
B) Ca and S
C) Cl and Br
D) Na and Mg

A iodide ion is
A) I2-
B) I2+
C) I+
D) I-

Potassium reacts with iodine to form
A) K2I3
B) KI
C) K2I
D) KI2

When calcium reacts with chlorine, the reaction involves a
A) transfer of electrons from Cl to Ca
B) sharing of electrons between Ca and Cl
C) creation of electrons
D) transfer of electrons from Ca to Cl

In reactions to form ionic compounds, nonmetals generally
A) become metals
B) lose electrons
C) gain electrons
D) do not react

The formula of aluminum oxide is
A) AlO2
B) Al2O3
C) AlO
D) AlO3

A covalent bond is formed when a pair of electrons is
A) destroyed
B) split
C) shared
D) transferred

Covalent bonds generally form between
A) metals and nonmetals
B) nonmetals
C) ions
D) metals

What is the name of the compound with the formula CF4?
A) carbon(IV) fluoride
B) fluorine carbonide
C) carbon tetrafluoride
D) carbon fluoride

_____________ is the measure of the tendency of an atom in a molecule to attract a shared pair of electrons to itself.
A) Precipitation
B) Electronegativity
C) Polarity
D) Ionization

What substance has polar covalent bonds?
A) F2
B) N2
C) BaO
D) SO2

In a polar covalent bond, electrons are
A) shared unequally
B) transferred
C) uncharged
D) shared equally

Sodium hydroxide is commonly known as lye. The formula of sodium hydroxide is
A) NaOH
B) Na2OH
C) SOH
D) Na(OH)2

The electron dot formula for carbon dioxide, CO2, is
A) C double bonds with each O containing 4 dots
B) C single bonds with 2 dots and each O containing 6 dots
C) C single bonds with 2 dots and each O containing 4 dots
D) C triple bonds with each O containing 2 dots

Atoms and molecules with odd numbers of electrons are called
A) covalent
B) odd
C) ions
D) free radicals

The best description of the shape of an ammonia molecule is
A) tetrahedral
B) linear
C) trigonal pyramidal
D) bent

Which of the following molecules is polar?
A) O2
B) CCl4
C) CO2
D) CH2Cl2

Propane (C3H8) reacts with oxygen (O2) to form carbon dioxide (CO2) and water (H2O). When the equation below is balanced, the coefficient of water is:
A) 2
B) 1
C) 4
D) 3

The label which indicates that a substance is a gas is
A) (g)
B) (l)
C) (aq)
D) (s)

Consider the following equation: 2 Na + 2 H2O –> 2 NaOH + H2. Identify the product(s) for this reaction
A) NaOH
B) Na
C) Na and H2O
D) NaOH and H2

Which of the following contains Avogadro’s number of atoms?
A) 40 g of bromine
B) 15.5 g of phosphorus
C) 39 g of potassium
D) 100 g of mercury

How many moles of sulfur atoms are present in 4.00 moles of CS2?
A) 2.00
B) 12.00
C) 8.00
D) 4.00

How many molecules are in 237 g (about a cup) of water?
A) 4267
B) 13.1
C) 7.92 x 10^24
D) 6.02 x 10^23

Nitroglycerin has a formula C3H5(NO3)3. The molar mass of nitroglycerin is
A) 65 g/mole
B) 309 g/mole
C) 227 g/mole
D) 398 g/mole

In the reaction CH4 + 2 O2 + CO2 + 2 H2O, how many moles of oxygen are required to burn 8.0 of methane?
A) 32
B) 2.0
C) 0.5
D) 1.0

What is the mass of 0.500 mol of NH3?
A) 7.50 g
B) 8.50 g
C) 34.0 g
D) 3.40 g

How many moles of (NH4)2S are there in 75 g of (NH4)2S?
A) 1.56
B) 1.50
C) 1.04
D) 1.10

A one molar solution is a solution that contains one mole of solute in
A) one kilogram of solvent
B) one liter of solution
C) one mole of solvent
D) one kilogram of solution

Molarity is a measure of
A) the volume of a solution
B) the ability of a substance to ionize
C) the concentration of a solute in a solution
D) the mass of a substance

Calculate the number of moles of sodium chloride needed to make 4.0 L of a 3.0 M solution.
A) 12 moles of sodium chloride
B) 7.0 moles of sodium chloride
C) 4.0 moles of sodium chloride
D) 3.0 moles of sodium chloride

The molarity of a solution that contains 0.50 moles of NaOH in 200.0 milliliters of water is
A) 0.5 M
B) 0.25 M
C) 1.0 M
D) 2.5 M

The molarity of a solution that contains 8.0 g of NaOH in a liter of solution is
A) 0.20 M
B) 2.0 M
C) 0.80 M
D) 0.020 M

A chemist dissolves 9 g of NaCl in 225 mL of water. Water is the
A) solvent
B) solubility
C) solution
D) solute

How many liters of a 0.2 M NaOH solution are needed in order to have 1.0 moles of NaOH?
A) 0.8 L
B) 8 L
C) 5 L
D) 0.2 L

A solution contains 20 mL of ethanol in a total volume of 100 mL. The concentration of this solution is
A) 2.0 M
B) 20% by mass
C) 20% by volume
D) 2.0% by mass

Which state of matter is characterized by having molecules close together, but moving randomly?
A) gas
B) liquid
C) solid
D) all of these

A gas
A) has no definite shape and no definite volume
B) has a definite volume but no definite shape
C) has both a definite shape and a definite volume
D) has a definite shape but no definite volume

The temperature at which a liquid becomes a gas is called the
A) decomposition point
B) melting point
C) sublimation point
D) boiling point

The process by which a liquid is converted to a gas is called
A) melting
B) vaporization
C) condensation
D) sublimation

The process by which a solid is converted to a gas is called
A) vaporization
B) liquefaction
C) sublimation
D) condensation

Which of the following is NOT a property of an ionic compound? Ionic compounds generally
A) form solutions that conduct electricity well
B) have melting points lower than those of molecular compounds
C) require more energy to change from the liquid to the gaseous state
D) dissolve in water

In a solution, the solvent is
A) always nonpolar
B) dissolved in the solute
C) always water
D) present in larger amount than the solute is