CHM 142 ACS FINAL EXAM CORRECT
100%
positive - ANSWER proton has a ___ charge
neutral - ANSWER neutron has a ____ charge
one unit of a negative charge - ANSWER beta particle has ____ charge
two units of positive charge - ANSWER alpha particle has ____ charge
neutron - ANSWER Which particle, if lost from the nucleus, will NOT result in a change
in the atom number?
-proton
-alpha particle
-beta particle
-neutron
protons & neutrons - ANSWER the nucleus contain
- ANSWER An atom of the element of atomic number 84 and mass number 199 emits
an alpha particle. The residual atom after this change has an atomic number of ___ and
a mass number of ___.
do not affect either - ANSWER how do gamma rays affect mass and atomic number?
for each one emitted (aka lost)
-atomic number decreases by 2
-mass number decreases by 4 - ANSWER when an alpha particle is emitted:
what happens to atomic number?
what happens to mass of atom?
for each one emitted (aka lost)
-atomic number increases by 1
-beta particles have no effect on mass - ANSWER when an beta particle is emitted:
what happens to atomic number?
what happens to mass of atom?
b) overcome the force of repulsion of the nucleus - ANSWER In effecting nuclear
changes by bombarding target nuclei with positively charged alpha particles, it is
necessary to accelerate these particles to high speed because it is necessary to
a) drive the positive particles through the electron cloud
b) overcome the force of repulsion of the nucleus
c) focus the bombarding particle more accurately
, d) strip electrons from the atom
d) conducts current when dissolved in water - ANSWER A simple method of showing
experimentally that a solid substance may be ionic is to show that it
a) has a high melting point
b) is soluble in polar solvents
c) depresses the freezing point of water
d) conducts current when dissolved in water
N, O, or F - ANSWER hydrogen bonds are H bonded to
- ANSWER intermolecular forces from
both - ANSWER polar solvents are able to dissolve polar covalent or ionic compounds?
covalent - ANSWER ionic compounds have high melting points, but so can ____
compounds
any nonvolatile solute - ANSWER ionic compounds depress the freezing point of water,
but so does..
ionic - ANSWER only ____ SOLID compounds conduct current when dissolved in water
the complete transfer of valence electron(s) between atoms
-a type of chemical bond that generates two oppositely charged ions
-the metal loses electrons to become a positively charged cation, whereas the nonmetal
accepts those electrons to become a negatively charged anion - ANSWER ionic
bonding
-form crystals/crystal lattices
-have high melting points and also high boiling points
-conduct electricity but only when they are dissolved in water
-water soluble - ANSWER properties of ionic compounds
hydrogen bonding - ANSWER The high boiling point of water can be explained by
ion-dipole, hydrogen bonding, dipole-dipole, dipole-induced dipole, dispersion -
ANSWER intermolecular forces from strongest to weakest
6, to prevent sodium from touching another sodium, it must be surrounded by a chlorine
on top of it, left of it, right of it, under it, in front of it, and behind it, totaling 6 Cl⁻ ions -
ANSWER Sodium chloride, NaCl, crystallizes in a face-centered cubic lattice of chloride
ions, with the smaller sodium ions occupying holes between the chloride ions. How
many Cl- ions are in contact with any single Na+ ion?
100%
positive - ANSWER proton has a ___ charge
neutral - ANSWER neutron has a ____ charge
one unit of a negative charge - ANSWER beta particle has ____ charge
two units of positive charge - ANSWER alpha particle has ____ charge
neutron - ANSWER Which particle, if lost from the nucleus, will NOT result in a change
in the atom number?
-proton
-alpha particle
-beta particle
-neutron
protons & neutrons - ANSWER the nucleus contain
- ANSWER An atom of the element of atomic number 84 and mass number 199 emits
an alpha particle. The residual atom after this change has an atomic number of ___ and
a mass number of ___.
do not affect either - ANSWER how do gamma rays affect mass and atomic number?
for each one emitted (aka lost)
-atomic number decreases by 2
-mass number decreases by 4 - ANSWER when an alpha particle is emitted:
what happens to atomic number?
what happens to mass of atom?
for each one emitted (aka lost)
-atomic number increases by 1
-beta particles have no effect on mass - ANSWER when an beta particle is emitted:
what happens to atomic number?
what happens to mass of atom?
b) overcome the force of repulsion of the nucleus - ANSWER In effecting nuclear
changes by bombarding target nuclei with positively charged alpha particles, it is
necessary to accelerate these particles to high speed because it is necessary to
a) drive the positive particles through the electron cloud
b) overcome the force of repulsion of the nucleus
c) focus the bombarding particle more accurately
, d) strip electrons from the atom
d) conducts current when dissolved in water - ANSWER A simple method of showing
experimentally that a solid substance may be ionic is to show that it
a) has a high melting point
b) is soluble in polar solvents
c) depresses the freezing point of water
d) conducts current when dissolved in water
N, O, or F - ANSWER hydrogen bonds are H bonded to
- ANSWER intermolecular forces from
both - ANSWER polar solvents are able to dissolve polar covalent or ionic compounds?
covalent - ANSWER ionic compounds have high melting points, but so can ____
compounds
any nonvolatile solute - ANSWER ionic compounds depress the freezing point of water,
but so does..
ionic - ANSWER only ____ SOLID compounds conduct current when dissolved in water
the complete transfer of valence electron(s) between atoms
-a type of chemical bond that generates two oppositely charged ions
-the metal loses electrons to become a positively charged cation, whereas the nonmetal
accepts those electrons to become a negatively charged anion - ANSWER ionic
bonding
-form crystals/crystal lattices
-have high melting points and also high boiling points
-conduct electricity but only when they are dissolved in water
-water soluble - ANSWER properties of ionic compounds
hydrogen bonding - ANSWER The high boiling point of water can be explained by
ion-dipole, hydrogen bonding, dipole-dipole, dipole-induced dipole, dispersion -
ANSWER intermolecular forces from strongest to weakest
6, to prevent sodium from touching another sodium, it must be surrounded by a chlorine
on top of it, left of it, right of it, under it, in front of it, and behind it, totaling 6 Cl⁻ ions -
ANSWER Sodium chloride, NaCl, crystallizes in a face-centered cubic lattice of chloride
ions, with the smaller sodium ions occupying holes between the chloride ions. How
many Cl- ions are in contact with any single Na+ ion?
