SDSU CHEMISTRY PLACEMENT TEST WITH
COMPLETE SOLUTIONS 100% 2023/2024
proton
-heavy
-positively charged
-nucleon
neutron
-heavy
-neutral
-nucleon
electron
-very small (1/1800 of proton)
-negative
-outside of nucleus
properties of nucleus
-# of protons determines the element
-held together by nuclear force
-# of protons is extremely stable unlike # of electrons
atomic number
equal to the # of protons
atomic mass
# of protons + # of neutrons averaged across all of the element on earth
isotopes
-when elements have different masses but the same chemical properties
-ex. silver-107 and silver-109
lewis dot
-a 2-D model that represents covalent bonds as straight lines, ionic bonds as spaces, and unbonded
valence electrons as dots
-can have single, double, or triple bonds
physical properties of compounds and molecules
-melting point
-boiling point
-solubility
-electrical conductivity
molecular mass
# of atoms(atomic mass)=molecular mass
, type (n)one of naming inorganic compounds
-metal and nonmetal
-cation anion-ide
-ex. NaCl: Sodium Chloride
type(II) of naming inorganic compounds
-cation( ) anion-ide
-ex. CuO: Copper(II) Oxide
type tri of naming inorganic compounds
-cation prefix anion-ide
-ex. CO: Carbon Monoxide
balancing equations
-need an equal number of atoms on each side
-ex. C12H22O11 + O2 --> CO2 + H2O
C12H22O11 + 12O2 --> 12CO2 + 11H2O
stoichiometry
-measuring the chemicals that go into and come out of any given reaction
-allows us to count atoms by weighing them
AMU
atomic mass unit
mole
- 6.022 x 10^23
-a mole of any element contains 6.022 x 10^23 atoms of that element no matter what
-mass of a mole depends on the average mass of the element
enthalpy
-only interested in how much heat is going to change
- H=E+PV
-E: internal energy; P: pressure; V: volume
entropy
a measure of molecular randomness or disorder
elctrostatic force
-like charges repel
-different charges attract
bond length
the distance between 2 nuclei at the point of minimum energy
electronegativity
COMPLETE SOLUTIONS 100% 2023/2024
proton
-heavy
-positively charged
-nucleon
neutron
-heavy
-neutral
-nucleon
electron
-very small (1/1800 of proton)
-negative
-outside of nucleus
properties of nucleus
-# of protons determines the element
-held together by nuclear force
-# of protons is extremely stable unlike # of electrons
atomic number
equal to the # of protons
atomic mass
# of protons + # of neutrons averaged across all of the element on earth
isotopes
-when elements have different masses but the same chemical properties
-ex. silver-107 and silver-109
lewis dot
-a 2-D model that represents covalent bonds as straight lines, ionic bonds as spaces, and unbonded
valence electrons as dots
-can have single, double, or triple bonds
physical properties of compounds and molecules
-melting point
-boiling point
-solubility
-electrical conductivity
molecular mass
# of atoms(atomic mass)=molecular mass
, type (n)one of naming inorganic compounds
-metal and nonmetal
-cation anion-ide
-ex. NaCl: Sodium Chloride
type(II) of naming inorganic compounds
-cation( ) anion-ide
-ex. CuO: Copper(II) Oxide
type tri of naming inorganic compounds
-cation prefix anion-ide
-ex. CO: Carbon Monoxide
balancing equations
-need an equal number of atoms on each side
-ex. C12H22O11 + O2 --> CO2 + H2O
C12H22O11 + 12O2 --> 12CO2 + 11H2O
stoichiometry
-measuring the chemicals that go into and come out of any given reaction
-allows us to count atoms by weighing them
AMU
atomic mass unit
mole
- 6.022 x 10^23
-a mole of any element contains 6.022 x 10^23 atoms of that element no matter what
-mass of a mole depends on the average mass of the element
enthalpy
-only interested in how much heat is going to change
- H=E+PV
-E: internal energy; P: pressure; V: volume
entropy
a measure of molecular randomness or disorder
elctrostatic force
-like charges repel
-different charges attract
bond length
the distance between 2 nuclei at the point of minimum energy
electronegativity
