Unit 4 Chemical Formulas
Explain why sulfur aluminide is not the correct name for a compound formed between sulfur and aluminum.
Aluminum is the cation (positively charged ion), and it must be first. Sulfur is the anion (negatively charged ion), and it must be second. You should change the ending of sulfur to -ide, so the correct name would be aluminum sulfide.
Write the formula for this molecular compound: carbon tetrachloride
CCl4
Write the formula for this ionic compound: calcium carbonate
CaCO3
Write the formula for this molecular compound: dichlorine heptoxide
Cl2O7
Write the formula composed of this pair of ions: K+, Cl-
KCl
Write the formula composed of this pair of ions: Mg2+, N3-
Mg3N2
Write the formula for this ionic compound: magnesium sulfide
MgS
Write the formula for this ionic compound: manganese (II) nitrate
Mn(NO3)2
Write the formula for this molecular compound: dinitrogen pentabromide
N2Br5
Write the formula for this ionic compound: ammonium nitrite
NH4NO2
Write the formula composed of this pair of ions: Na+1, O2-
Na2O
Write the formula for this molecular compound: trisilicon tetranitride
Si3N4
Name this ionic compound: NH4NO3
ammonium nitrate
anion
any negatively charged ion (gains valence electrons to attain a noble gas configuration)
cation
any positively charged ion (loses valence electrons to attain a noble gas configuration)
ion
atom or group of atoms that have a positive or negative charge
Name this ionic compound: Ca(NO3)2
calcium nitrate
Name this molecular compound: CO2
carbon dioxide
Name this molecular compound: CCl4
carbon tetrachloride
How is a formula for ionic compounds written?
cation is always written first, followed by the anion
when naming ionic compounds, what do you do to the anion?
change the ending to -ide, unless it is a polyatomic ion
Name this ionic compound using roman numerals: CuOH
copper (I) hydroxide
polyatomic ion
ion made up of more than one atom; acts as an individual ion in a compound and its charge applies for the entire group of atoms
Name this ionic compound using roman numerals: FeI2
iron (II) iodide
Name this ionic compound using roman numerals: Pb(NO2)2
lead (II) nitrite
Name this molecular compound: N2O
nitrogen dioxide
ionic compounds have _______ net charge
no; positive and negative charges must equal 0
Name this molecular compound: PI3
phosphorus triiodide
Name this ionic compound: KClO3
potassium chlorate
superscripts
represent the charge of each element
subscripts
represent the number of ions of each element in an ionic compound
Name this ionic compound: Na3PO4
sodium phosphate
chemical bond
the force that holds two atoms together
roman numerals are used
to show the charge of a transition metal; put in parentheses between the two names
Name this ionic compound using roman numerals: ZnF2
zinc (II) fluoride
