Compounds and Stoichiometry Flashcards
(18 cards)
pure substances composed of two or more elements in a fixed proportion
compounds
Which of the following types of reactions generally have the same number of reactants and products?
I. Double-displacement Reaction
II. Single-displacement Reactions
III. Combination reactions
A. I only
B. II only
C. I and II only
D. II and III only
C
Which of the following would make the strongest electrolytic solution?
A. a non-polar covalent compound with significant solubility
B. an ionic compound composed of one cation with +3 charge and three anions with -1 charge
C. A polar covalent compound with a small dissociation constant
D. An ionic compound composed of two cations with a +1 charge and one anion with -2 charge
B
a combination of two or more atoms held together by covalent bonds
molecule
represents the empirical formula of a compound
formula unit
weighted average of the masses of the naturally occurring isotopes of an element
atomic weights
the sum of atomic weights of all the atoms in a molecule and its units are atomic mass units (amu) per molecule
molecular weights
adding of the atomic weights of the constituent ions according to its empirical formula
formula weight
Avogadro’s Number
6.022e23/mol
molar mass
g/mol
molecular weight
amu/molecule
moles
[mass of sample (g)] / [molar mass (g/mol)]
gram equivalent weight
(molar mass) / (n)
equivalents
[mass of compound (g)] / [gram equivalent weight (g)]
measure of concentration, given in the units [(equivalents)/L]
most commonly used for hydrogen ion concentration
normality (N)
molarity
(Normality) / (n)
What is the Gram equivalent weight (GEW) of sulfuric acid?
49.05g/mol H+
