Studied by 0 people
Looks like no one added any tags here yet for you.
Which phrase describes the nucleus of any atom?
has an overall positive charge
Which two particles each have a mass of approximately one atomic mass unit?
a neutron and a proton
The wave-mechanical model of the atom describes the location of electrons
in orbitals outside the nucleus
When a ground state electron in an atom moves to an excited state, the electron
absorbs energy as it moves to a higher energy state
Which statement describes a chemical property of iron?
Iron reacts with nitric acid.
Diamond and graphite are two forms of solid carbon. These two forms of carbon have
different crystal structures and different properties
Which substance can be broken down by a chemical change?
ethane
At STP, which property can be used to differentiate a 10.-gram sample of NaCl(s) from a 10.-gram sample of NaNO3(s)?
solubility in water
What is the number of electrons shared between the two atoms in an O2 molecule?
4
Which changes in both charge and radius occur when an atom loses an electron?
A positive ion is formed with a smaller radius than the atom
Which statement describes what occurs when two iodine atoms react to produce an iodine molecule?
A bond breaks and energy is absorbed.
Which process can be used to separate a mixture of two liquids having different boiling points?
distillation
Which statement describes a solution of sodium chloride in water?
The mixture is homogeneous, the solute is NaCl and the solvent is H2O.
At STP, which property would be the same for 1.0 liter of helium and 1.0 liter of argon?
number of atoms
The melting of an ice cube is an example of an
endothermic, physical change
Which statement explains the low boiling point of hydrogen, H2, at standard pressure?
Hydrogen has weak intermolecular forces.
In chemical reactions, which term is defined as the difference between the potential energy of the products and the potential energy of the reactants?
heat of reaction
Which phrase describes what happens to the reaction pathway and activation energy of a reaction to which a catalyst is added?
a different pathway with a lower activation energy
An atom of which element is bonded to the carbon atom in the amide functional group?
nitrogen
Which statement describes the two isomers of butane?
They have the same molecular formula but different structural formulas.
Which term represents an organic reaction that produces soap?
saponification
In which part of an electrochemical cell does reduction occur?
cathode
Which energy change occurs in an operating voltaic cell?
chemical energy to electrical energy
Which substance is an Arrhenius base?
LiOH
Which statement represents neutralization?
An Arrhenius acid and an Arrhenius base react to produce water and a salt.
A tenfold increase in hydronium ion concentration is represented by
a decrease of one unit of pH
Based on Table N, which particle is emitted by the radioactive decay of francium-220?
an alpha particle
Which type of reaction releases the greatest amount of energy per kilogram of reactant?
fission reaction
Which risk is related to the radioactive isotopes used to generate electricity?
exposure to nuclear emmisions
