Atomic Concepts
The mass of each proton and each neutron is approximately equal to
(1) 1 g (3) 1 u (2) 1 mL (4) 1 mol
1 u
4 The elements on the Periodic Table of the Elements are arranged in order of increasing
(1) atomic mass (2) atomic number
(3) mass number (4) oxidation state
(2) atomic number
Which type of chemical formula shows the arrangement of the atoms in a molecule? (1) empirical formula (3) molecular formula (2) general formula (4) structural formula
(4) structural formula
All matter can be classified as
(1) an element
(2) a compound
(3) a mixture or an element
(4) a mixture or a substance
(4) a mixture or a substance
he concentration of which ion is increased when LiOH is dissolved in water?
(1) hydroxide ion (3) hydronium ion
(2) hydrogen ion (4) halide ion
(1) hydroxide ion
Which particles are found in the nucleus of an argon atom?
(1) protons and electrons
(2) protons and neutrons
(3) protons and neutrons
(4) positrons and electrons
(3) protons and neutrons
Which statement explains why a xenon atom is electrically neutral?
(1) The atom has fewer neutrons than electrons.
(2) The atom has more protons than electrons.
(3) The atom has the same number of neutrons and electrons.
(4) The atom has the same number of protons and electrons.
(4) The atom has the same number of protons and electrons.
Graphite and diamond are two forms of the same element in the solid phase that differ in their
(1) atomic numbers
(2) crystal structures
(3) electronegativities
(4) empirical formulas
(2) crystal structures
Which process is a chemical change?
(1) condensation of H2O(g)
(2) synthesis of MgO(s)
(3) evaporation of C2H5OH(l)
(4) sublimation of CO2(s)
(2) synthesis of MgO(s)
Which period contains the greatest number of metals?
1) 1 3) 3
2) 2 4) 4
4) 4
How many electrons are shared in a triple bond between two atoms?
(1) 6 (2) 2 (3) 3 (4) 4
If two atoms are isotopes of the same element, the atoms must have
(1) the same number of protons and the same number of neutrons
(2) the same number of protons and a different number of neutrons
(3) a different number of protons and the same number of neutrons
(4) a different number of protons and a different number of neutrons
(2) the same number of protons and a different number of neutrons
Carbon monoxide and carbon dioxide have
(1) the same chemical properties and the same physical properties
(2) the same chemical properties and different physical properties
(3) different chemical properties and the same physical properties
(4) different chemical properties and different physical properties
(4) different chemical properties and different physical properties
Which property is determined by the structure, arrangement, and interactions of the molecules of a substance at a given temperature and pressure?
(1) atomic radius (3) formula mass
(2) half-life (4) physical state
(4) physical state
Which particle has the least mass?
(1) alpha particle (3) neutron
(2) beta particle (4) proton
(2) beta particle
Krypton atoms in the ground state tend not to bond with other atoms because their
(1) second electron shell contains eight electrons
(2) third electron shell contains eighteen electrons
(3) innermost electron shell contains two electrons
(4) outermost electron shell contains eight electrons
(4) outermost electron shell contains eight electrons
The weighted average of the atomic masses of the naturally occurring isotopes of an element is the
(1) atomic mass of the element
(2) atomic number of the element
(3) mass number of each isotope
(4) formula mass of each isotope
(1) atomic mass of the element
Which formula can represent an alkyne?
(1) C2H4 (3) C3H4
(2) C2H6 (4) C3H6
(3) C3H4
Which element must be present in an organic compound?
(1) carbon (2) sulfur (3) nitrogen (4) oxygen
(1) carbon
The energy released during a nuclear reaction is a result of
(1) breaking chemical bonds
(2) forming chemical bonds
(3) mass being converted to energy
(4) energy being converted to mass
(3) mass being converted to energy
The mass of an electron is
(1) equal to the mass of a proton
(2) equal to the mass of a neutron
(3) greater than the mass of a proton
(4) less than the mass of a neutron
(4) less than the mass of a neutron
Which statement describes a chemical property of iron?
(1) Iron oxidizes.
(2) Iron is a solid at STP.
(3) Iron melts.
(4) Iron is attracted to a magnet.
(1) Iron oxidizes.
Which equation represents an addition reaction?
(1) C3H8 + Cl2 → C3H7Cl + HCl
(2) C3H6 + Cl2 → C3H6Cl2
Which equation represents an addition reaction?
(1) C3H8 + Cl2 → C3H7Cl + HCl
(2) C3H6 + Cl2 → C3H6Cl2
(3) CaCl2 + Na2CO3 → CaCO3 + 2NaCl
(4) CaCO3 → CaO + CO2
(3) CaCl2 + Na2CO3 → CaCO3 + 2NaCl
(4) CaCO3 → CaO + CO2
(2) C3H6 + Cl2 → C3H6Cl2
Which term describes an acid according to one acid-base theory?
(1) H+ acceptor
(2) H+ donor
(3) H2 acceptor
(4) H2 donor
(2) H+ donor
What is the approximate mass of an atom that contains 26 protons, 26 electrons and 19 neutrons?
(1) 26 u (3) 52 u
(2) 45 u (4) 71 u
(2) 45 u