Chemistry (H): Ch.7 Test Review
How many atoms are present in each of these formula units? Fe(ClO2)3
10
How many moles of each element are present in a 10.0 mol sample of Ca(NO3)2?
10 moles of ca 20 moles of nitrogen 60 moles of oxygen
How many atoms are present in each of these formula units Ca(HCO3)2
11
The explosive TNT has the molecular formula C7H5(NO2)3 a. How many elements make up this compound? b. How many oxygen atoms are present in one molecule of C7H5(NO2)3? c. How many atoms in total are present in one molecule of C7H5(NO2)3?
4 elements 6 oxygen atoms 21 total atoms
How many atoms are present in each of these formula units? C12H22O11
45
How many atoms are present in each of these formula units? Fe(ClO3)2
9
empirical formula C6H12
CH2
empirical formula C2h6O4
CH3O2
What is the formula for sulfuric acid?
H2SO4
empirical formula Hg2C12
HgCl
What is the formula for the compound dinitrogen pentoxide?
N2O5
empirical formula N2O5
N2O5
Changing a subscript in a correctly written chemical formula
changes formula no longer represents compound
Samples of equal numbers of moles of two different chemicals must have equal masses as well. (T/F)
false
Derive a generalization for determining whether an acid name will end in the suffix -ic or -ous.
ic = anion name ends in -ate -ous= anion name ends in -ite
What is the Stock system name for the compound FeO?
iron (II) oxide
Derive a generalization for determining whether an acid name will begin with the prefix hydro- or not.
never used for ending -ate or -ite
What is the name for the acid H3PO4?
phosphoric acid
In a Stock system name such as iron (III) sulfate, the Roman numeral tells us
the charge on each Fe ion
Binary ionic compounds are composed of metals and nonmetals, typically from opposite sides of the periodic table. (T/F)
true
Covalently bonded binary molecular compounds are typically composed of nonmetals. (T/F)
true
If the formula mass of one molecule is x u, the molar mass is x g/mol. (T/F)
true
Samples of equal numbers of moles of two different molecular compounds must have equal numbers of molecules as well. (T/F)
true
