SDSU CHEMISTRY PLACEMENT TEST WITH
COMPLETE SOLUTIONS 100% 2023/2024
proton - correct answer -heavy -positively charged -nucleon neutron - correct answer -heavy -neutral -nucleon electron - correct answer -very small (1/1800 of proton) -negative -outside of nucleus properties of nucleus - correct answer -# of protons determines the element -held together by nuclear force -# of protons is extremely stable unlike # of electrons atomic number - correct answer equal to the # of protons atomic mass - correct answer # of protons + # of neutrons averaged across all of the element on earth isotopes - correct answer -when elements have different masses but the same chemical properties -ex. silver-107 and silver-109 lewis dot - correct answer -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 1 / 2
physical properties of compounds and molecules - correct answer -melting point -boiling point -solubility -electrical conductivity molecular mass - correct answer # of atoms(atomic mass)=molecular mass type (n)one of naming inorganic compounds - correct answer -metal and nonmetal -cation anion-ide
-ex. NaCl: Sodium Chloride
type(II) of naming inorganic compounds - correct answer -cation( ) anion-ide
-ex. CuO: Copper(II) Oxide
type tri of naming inorganic compounds - correct answer -cation prefix anion-ide
-ex. CO: Carbon Monoxide
balancing equations - correct answer -need an equal number of atoms on each side -ex. C12H22O11 + O2 --> CO2 + H2O C12H22O11 + 12O2 --> 12CO2 + 11H2O stoichiometry - correct answer -measuring the chemicals that go into and come out of any given reaction -allows us to count atoms by weighing them AMU - correct answer atomic mass unit mole - correct answer - 6.022 x 10^23 -a mole of any element contains 6.022 x 10^23 atoms of that element no matter what
- / 2