1-5
The results of the gold foil experiment led to the conclusion that an atom is
(1) mostly empty space and has a small, negatively charged nucleus
(2) mostly empty space and has a small, positively charged nucleus
(3) a hard sphere and has a large, negatively charged nucleus
(4) a hard sphere and has a large, positively
charged nucleus
(2) mostly empty space and has a small, positively charged nucleus
The elements on the Periodic Table of the
Elements are arranged in order of increasing
(1) atomic number
(2) mass number
(3) number of neutrons
(4) number of valence electrons
(1) atomic number
Which term represents the sum of the atomic
masses of the atoms in a molecule?
(1) atomic number
(2) mass number
(3) formula mass
(4) percent composition by mass
(3) formula mass
Which form of energy is transferred when an ice cube at 0°C is placed in a beaker of water at 50°C?
(1) chemical
(2) electrical
(3) nuclear
(4) thermal
(4) thermal
Atoms are neutral because the number of
(1) protons equals the number of neutrons
(2) protons equals the number of electrons
(3) neutrons is greater than the number of
protons
(4) neutrons is greater than the number of
electrons
(2) protons equals the number of electrons
Which element is malleable at STP?
(1) chlorine
(2) copper
(3) helium
(4) sulfur
(2) copper
Which equation represents energy being
absorbed as a bond is broken?
(1) H + H → H2 + energy
(2) H + H + energy → H2
(3) H2 → H + H + energy
(4) H2 + energy → H + H
(4) H2 + energy → H + H
The average kinetic energy of the particles in a sample of matter is expressed as
(1) density
(2) volume
(3) pressure
(4) temperature
(4) temperature
In the ground state, valence electrons of a krypton atom are found in
(1) the first shell
(2) the outermost shell
(3) both the nucleus and the first shell
(4) both the first shell and the outermost shell
(2) the outermost shell
At 298 K and 1 atm, which noble gas has the lowest density?
(1) Ne
(2) Kr
(3) Xe
(4) Rn
(1) Ne
Which term is used to describe the attraction
that an oxygen atom has for the electrons in a
chemical bond?
(1) alkalinity
(2) electronegativity
(3) electron configuration
(4) first ionization energy
(2) electronegativity
At STP, which gas sample has the same number
of molecules as 2.0 liters of CH4(g) at STP?
(1) 1.0 liter of C2H6(g)
(2) 2.0 liters of O2(g)
(3) 5.0 liters of N2(g)
(4) 6.0 liters of CO2(g)
(2) 2.0 liters of O2(g)
According to the wave-mechanical model of the atom, electrons are located in
(1) orbitals
(2) circular paths
(3) a small, dense nucleus
(4) a hard, indivisible sphere
(1) orbitals
Which two terms represent types of chemical formulas?
(1) empirical and molecular
(2) polar and nonpolar
(3) synthesis and decomposition
(4) saturated and concentrated
(1) empirical and molecular
Which substance can not be decomposed by
chemical means?
(1) C
(3) CO2
(2) CO
(4) C3O2
(1) C
Given the equation:
I2(s) → I2(g)
Which phrase describes this change?
(1) endothermic chemical change
(2) endothermic physical change
(3) exothermic chemical change
(4) exothermic physical change
(2) endothermic physical change
Which electron configuration represents the electrons in an atom of sodium in the ground state at STP?
(1) 2-8-1
(2) 2-7-2
(3) 2-8-6
(4) 2-7-7
(1) 2-8-1
Which quantities are conserved in all chemical
reactions?
(1) charge, pressure, and energy
(2) charge, mass, and energy
(3) volume, pressure, and energy
(4) volume, mass, and pressure
(2) charge, mass, and energy
A beaker contains a dilute NaCl solution at 1 atm. What happens to the
number of solute particles in the solution and
the boiling point of the solution, as more sodium
chloride is dissolved?
(1) The number of solute particles increases,
and the boiling point increases.
(2) The number of solute particles increases,
and the boiling point decreases.
(3) The number of solute particles decreases,
and the boiling point increases.
(4) The number of solute particles decreases,
and the boiling point decreases.
(1) The number of solute particles increases, and the boiling point increases.
Which term identifies a factor that will shift a chemical equilibrium?
(1) atomic radius
(2) catalyst
(3) decay mode
(4) temperature
(4) temperature