A) a stable electron configuration B) vaporization C) an exchange of energy D) an exchange of energy
A) an even number of electrons B) more electrons than either protons or neutrons. C) an outermost energy level that is full of electrons D) an equal number of protons and electrons.
A) the nucleus. B) the nucleus and all non-valence electrons. C) the nucleus and all electrons. D) the nucleus and valence electrons
A) sharing of electrons. B) transfer of electrons. C) transfer of neutrons. D) transfer of protons.
A) four valence electrons. B) four different cations C) two inner energy levels. D) no protons in its nucleus.
A) electric currents. B) nuclear forces. C) physical bonds. D) chemical bonds.
A) one atom’s nucleus and another atom’s electrons. B) atoms with neutral charges C) ions with opposite charges D) the electrons of two different atoms
A) there are two magnesium ions for each ion of chlorine B) there are two chloride ions for each magnesium ion. C) the chloride ion is twice the size of the magnesium ion. D) magnesium and chlorine form a double covalent bond.
A) two atoms of chlorine B) one atom of oxygen. C) two atoms of oxygen. D) one atom of chlorine.
A) contain charged ions that are locked tightly together B) are positively charged. C) contain metallic elements D) are made of elements that are solid at room temperature.
A) SO3 B) NN C) OO D) O3
A) alkaline earth metals B) halogens. C) alkali metals. D) transition metals.
A) fluorine lithide B) lithium fluoride C) lithium fluorine D) fluorine lithium
A) iron ions with a negative charge. B) iron ions with an 11+ charge. C) two types of iron ions. D) iron ions with a 2+ charge.
A) atomic number B) period C) atomic mass D) group number
A) BeCl2 B) 2BeCl C) Be2Cl D) Be2Cl2
A) two oxygen atoms B) two carbon atoms C) an ionic bond D) a polyatomic ion
A) electrons are transferred between atoms B) the lattice that forms contains anions and cations C) there is an attraction between positively charged and negatively charged particles D) electrons are shared between atoms
A) NaOH and HCl B) NaOH and H2O C) NaCl and H2O D) HCl and NaCl
A) 2Na + Br2 NaBr B) 2Na + Br2 2NaBr C) Na + Br2 2NaBr D) Na + Br2 NaBr
A) CH4 + O2 H2O + CO2 B) CH4 + 4O 2H2O + CO2 C) CH4 + O H2O + CO2 D) CH4 + 2O2 2H2O + CO2
A) Electrons are gained only B) Electrons are both gained and lost C) Electrons are lost only D) Electrons are neither gained nor lost
A) It lost electrons and was reduced. B) It lost electrons and was oxidized. C) It gained electrons and was oxidized D) It gained electrons and was reduced.
A) movement of the electrons. B) nuclei of the atoms. C) unbonded electrons. D) bonds.
A) Bonds of the reactants are formed, and bonds of the products are broken. B) The bonds of both the reactants and the products are broken. C) Bonds of the reactants are broken, and bonds of the products are formed. D) The bonds of both the reactants and the products are formed.
A) both endothermic and exothermic B) exothermic C) neither endothermic nor exothermic D) endothermic
A) reactant is greater than the chemical energy of the products. B) reactant and the chemical energy of the products are equal C) products is greater than the chemical energy of the reactant. D) reaction is conserved. |