Chemistry Diagnostic Exam: Quiz! Trivia

What is the number of electrons in an atom that has 3 protons and 4 neutrons? 

• 1

• 7

• 3

• 4

As a result of the gold foil experiment, it was concluded that an atom.

• Contains protons, neutrons, and electrons

• Contains a small, dense nucleus

• Has positrons and orbitals

• Is a hard, indivisible sphere

Which statement describes the distribution of charge in an atom? 

• A neutral nucleus is surrounded by one or more negatively charged electrons.

• A neutral nucleus is surrounded by one or more positively charged electrons.

• A positively charged nucleus is surrounded by one or more negatively charged electrons.

• A positively charged nucleus is surrounded by one or more positively charged electrons.

Which atom in the ground state has an outermost electron with the most energy? 

• Cs

• K

• Li

• Na

Which particle has the least mass?

• Alpha particle

• Beta particle

• Neutron

• Proton

The elements in Group 2 are classified as    

• Metals

• Metalloids

• Nonmetals

• Noble gases

Which list includes elements with the most similar chemical properties? 

• Br, Ga, Hg

• Cr, Pb, Xe

• O, S, Se

• N, O, F

• Mass number, only

• Atomic number, only

• Both mass number and atomic number

• Neither mass number nor atomic number

Which pair represents two forms of an element in the same phase at STP but with different structures and different properties? 

• I2(s) and I2(g)

• O2(g) and O3(g)

• H2(g) and Hg(g)

• H2O(s) and H2O(l)

The elements on the Periodic Table are arranged in order of increasing 

• Atomic mass

• Atomic number

• Molar mass

• Oxidation number

What is the IUPAC name for the compound ZnO? 

• Zinc oxide

• Zinc oxalate

• Zinc peroxide

• Zinc hydroxide

Which atom attains a stable valence electron configuration by bonding with another atom? 

• Neon

• Radon

• Hydrogen

• Helium

An ionic bond can be formed when one or more electrons are 

• Equally shared by two atoms

• Unequally shared by two atoms

• Transferred from the nucleus of one atom to the nucleus of another atom

• Transferred from the valence shell of one atom to the valence shell of another atom

Which sample of CO2 has a definite shape and a definite volume? 

• CO2 (aq)

• CO2 (g)

• CO2 (l)

• CO2 (s)

What occurs in order to break the bond in a Cl2 molecule? 

• Energy is absorbed.

• Energy is released.

• The molecule creates energy.

• The molecule destroys energy.

A sealed, rigid 1.0-liter cylinder contains He gas at STP. An identical sealed cylinder contains Ne gas at STP. These two cylinders contain the same number of 

• Atoms

• Electrons

• Ions

• Protons

Which statement describes a chemical change?    

• Alcohol evaporates.

• Water vapor forms snowflakes.

• Table salt (NaCl) is crushed into powder.

• Glucose (C6H12O6) and oxygen produce CO2 and H2O.

Which statement describes the particles of an ideal gas according to the kinetic molecular theory? 

• The gas particles are arranged in a regular geometric pattern.

• The gas particles are in random, constant, straight-line motion.

• The gas particles are separated by very small distances, relative to their sizes.

• The gas particles are strongly attracted to each other.

Which sample of matter is classified as a substance? 

• Air

• Ammonia

• Milk

• Seawater

Which element has the lowest electronegativity value? 

• F

• Fr

• Cl

• Cr

At standard pressure, CH4 boils at 112 K and H2O boils at 373 K. What accounts for the higher boiling point of H2O at standard pressure? 

• Covalent bonding

• Ionic bonding

• Hydrogen bonding

• Metallic bonding

A mixture of sand and table salt can be separated by filtration because the substances in the mixture differ in 

• Solubility in water

• Freezing point

• Density at STP

• Boiling point

Systems in nature tend to undergo changes toward 

• Lower energy and lower entropy

• Lower energy and higher entropy

• Higher energy and lower entropy

• Higher entropy and higher entropy

In the wave-mechanical model of the atom, an orbital is the most probable location of 

• A proton

• A positron

• A neutron

• An electron

Functional groups are used to classify    

• Organic compounds

• Inorganic compounds

• Heterogeneous mixtures

• Homogeneous mixtures

Which class of compounds contains at least one element from Group 17 of the Periodic Table?

• Aldehyde

• Amine

• Ester

• Halide

In a propanal molecule, an oxygen atom is bonded with a carbon atom.  What is the total number of pairs of electrons shared between these atoms?

• 1

• 2

• 3

• 4

When a voltaic cell operates, ions move through the 

• Anode

• Cathode

• Salt bridge

• External circuit

When dissolved in water, an Arrhenius base yields

• Hydrogen ions

• Hydronium ions

• Hydroxide ions

• Oxide ions

What is the total number of valence electrons in a germanium atom in the ground state? 

• 22

• 2

• 32

• 4

Which element is paired with an excited-state electron configuration for an atom of the element? 

• Ca: 2-8-8-2

• Na: 2-8-2

• K: 2-6-8-3

• F: 2-8

Given the balanced equations representing two chemical reactions:      Cl2 + 2NaBr → 2NaCl + Br2      2NaCl → 2Na + Cl2 Which types of chemical reactions are represented by these equations? 

• Single replacement and decomposition

• Single replacement and double replacement

• Synthesis and decomposition

• Synthesis and double replacement

An ion that consists of 7 protons, 6 neutrons, and 10 electrons has a net charge of 

• 4−

• 3−

• 3+

• 4+

Which Lewis electron-dot diagram represents a molecule having a nonpolar covalent bond? 

Which quantity is equal to 50 kilojoules?    

• 0.05 J

• 5000 J

• 500 J

• 50 000 J

Which compound is formed from its elements by an exothermic reaction at 298 K and 101.3 kPa? 

• C2H4 (g)

• HI (g)

• H2O (g)

• NO2 (g)

At which temperature is the vapor pressure of ethanol equal to 80. kPa? 

• 48°C

• 73°C

• 80.°C

• 101°C

At 25°C, gas in a rigid cylinder with a movable piston has a volume of 145 mL and a pressure of 125 kPa. Then the gas is compressed to a volume of 80. mL. What is the new pressure of the gas if the temperature is held at 25°C? 

• 69 kPa

• 93 kPa

• 160 kPa

• 230 kPa

A 2400.-gram sample of an aqueous solution contains 0.012 gram of NH3. What is the concentration of NH3 in the solution, expressed as parts per million? 

• 5.0 ppm

• 15 ppm

• 20. ppm

• 50. ppm

Which equation represents a change that results in an increase in disorder? 

• I2 (s) → I2 (g)

• CO2 (g) → CO2 (s)

• 2Na (s) + Cl2 (g) → 2NaCl (s)

• 2H2 (g) + O2 (g) → 2H2O (l)

A solution consists of 0.50 mole of CaCl2 dissolved in 100. grams of H2O at 25°C. Compared to the boiling point and freezing point of 100. grams of H2O at standard pressure, the solution at standard pressure has 

• A lower boiling point and a lower freezing point

• A lower boiling point and a higher freezing point

• A higher boiling point and a lower freezing point

• A higher boiling point and a higher freezing point

Given the balanced ionic equation representing a reaction:  Which half-reaction represents the reduction that occurs? 

Given the equation and potential energy diagram representing a reaction:  If each interval on the axis labeled “Potential Energy (kJ/mol)” represents 10. kJ/mol, what is the heat of reaction? 

• +60. kJ/mol

• +20. kJ/mol

• +30. kJ/mol

• +40. kJ/mol

Some solid KNO3 remains at the bottom of a stoppered flask containing a saturated KNO3(aq) solution at 22°C. Which statement explains why the contents of the flask are at equilibrium? 

• The rate of dissolving is equal to the rate of crystallization.

• The rate of dissolving is greater than the rate of crystallization.

• The concentration of the solid is equal to the concentration of the solution.

• The concentration of the solid is greater than the concentration of the solution.

Which formula represents the product of the addition reaction between ethene and chlorine, Cl2? 

Based on Reference Table J, which two reactants react spontaneously? 

• Mg(s) + ZnCl2(aq)

• Cu(s) + FeSO4(aq)

• Pb(s) + ZnCl2(aq)

• Co(s) + NaCl(aq)

When the pH value of a solution is changed from 2 to 1, the concentration of hydronium ions 

• Decreases by a factor of 2

• Increases by a factor of 2

• Decreases by a factor of 10

• Increases by a factor of 10

Given the balanced equation representing a nuclear reaction:  Which phrase identifies and describes this reaction? 

• Fission, mass converted to energy

• Fission, energy converted to mass

• Fusion, mass converted to energy

• Fusion, energy converted to mass