Gen Chem 1 Final Exam Questions and
Answers
Matter - correct answer-Most basic building block. Must have mass and volume
Elements - correct answer-Simplest form of matter, can't decompose any further
Molecules - correct answer-Two or more atoms "linked" together
Compounds - correct answer-Mixes of two or more elements bonded together
Sig Fig.- x & / - correct answer-As many as the least number
Sig Fig.- + & - - correct answer-As many as the least behind the decimal point
Law of Definite Composition - correct answer-Components in a compound always have
the same ratio by mass
Law of Multiple Proportions - correct answer-Ratios of elements that combine to make a
compound are always in fixed, whole number, proportions
Atom Distinguishing - correct answer-The only thing that distinguishes one atom from
another is the number of protons
Isotopes - correct answer-Sam element, different number of neutrons
Cation - correct answer-Carry the positive charge, a metal
Anion - correct answer-Carry the negative charge, non-metal
Diotonics - correct answer-O₂, H₂, N₂, F₂, Cl₂, .....
Covalent Naming - correct answer-Name both compounds with number prefix
mono, di, tri, tetra, penta
CO₂ Carbon dioxide
Ionic Naming - correct answer-Metal (Cation) + Non-metal (Anion)
KBr- Potassium Bromide
, Molecular Weight - correct answer-Sum of all the atomic masses of elements in
molecule
Avogadros Number - correct answer-6.022 x 10²³ "things"
Percent Composition - correct answer-Molecular weight- mass of compound- x100=
percent
Empirical Formula - correct answer-Simplest ratio of elements in compound
Molecular Formula - correct answer-Actual number of moles of elements in compound
P₂O₅ vs. P₄O₁₀
Law of Conservation of Mass - correct answer-# Reactants = # Products
Limiting Reagents - correct answer-One element limits the reaction because you will run
of that sooner, leaving some of the other compound left over
Aqueous Solutions - correct answer-Water solution in which a substance is dissolved
Homogeneous solution - correct answer-Two things mixed together to make one, where
ever you take a sample, the composition will be the same
Solvent - correct answer-The major component (aqueous is water)
Solute - correct answer-The minor component ( usually a salt or an acid)
Forming ions - correct answer-Ionic compounds that DO dissolve in water, form ions, or
electrolytes
Electrolytes - correct answer-ion in water, can't begin until the compound dissolves in
water.
Number of ions formed - correct answer-When looking at salts, the number of ions
formed tells how good at conduction electricity it is
Strong electrolyte - correct answer-a compound that dissolves 100% and generates
ions
Strong acid - correct answer-HCl, HNO₃, HBr, HI, H₂SO₄
Strong bases - correct answer-OH⁻ NaOH, LiOH, KOH
Weak electrolytes - correct answer-Mostly weak acids, compounds that don't dissolve
completely in water
Answers
Matter - correct answer-Most basic building block. Must have mass and volume
Elements - correct answer-Simplest form of matter, can't decompose any further
Molecules - correct answer-Two or more atoms "linked" together
Compounds - correct answer-Mixes of two or more elements bonded together
Sig Fig.- x & / - correct answer-As many as the least number
Sig Fig.- + & - - correct answer-As many as the least behind the decimal point
Law of Definite Composition - correct answer-Components in a compound always have
the same ratio by mass
Law of Multiple Proportions - correct answer-Ratios of elements that combine to make a
compound are always in fixed, whole number, proportions
Atom Distinguishing - correct answer-The only thing that distinguishes one atom from
another is the number of protons
Isotopes - correct answer-Sam element, different number of neutrons
Cation - correct answer-Carry the positive charge, a metal
Anion - correct answer-Carry the negative charge, non-metal
Diotonics - correct answer-O₂, H₂, N₂, F₂, Cl₂, .....
Covalent Naming - correct answer-Name both compounds with number prefix
mono, di, tri, tetra, penta
CO₂ Carbon dioxide
Ionic Naming - correct answer-Metal (Cation) + Non-metal (Anion)
KBr- Potassium Bromide
, Molecular Weight - correct answer-Sum of all the atomic masses of elements in
molecule
Avogadros Number - correct answer-6.022 x 10²³ "things"
Percent Composition - correct answer-Molecular weight- mass of compound- x100=
percent
Empirical Formula - correct answer-Simplest ratio of elements in compound
Molecular Formula - correct answer-Actual number of moles of elements in compound
P₂O₅ vs. P₄O₁₀
Law of Conservation of Mass - correct answer-# Reactants = # Products
Limiting Reagents - correct answer-One element limits the reaction because you will run
of that sooner, leaving some of the other compound left over
Aqueous Solutions - correct answer-Water solution in which a substance is dissolved
Homogeneous solution - correct answer-Two things mixed together to make one, where
ever you take a sample, the composition will be the same
Solvent - correct answer-The major component (aqueous is water)
Solute - correct answer-The minor component ( usually a salt or an acid)
Forming ions - correct answer-Ionic compounds that DO dissolve in water, form ions, or
electrolytes
Electrolytes - correct answer-ion in water, can't begin until the compound dissolves in
water.
Number of ions formed - correct answer-When looking at salts, the number of ions
formed tells how good at conduction electricity it is
Strong electrolyte - correct answer-a compound that dissolves 100% and generates
ions
Strong acid - correct answer-HCl, HNO₃, HBr, HI, H₂SO₄
Strong bases - correct answer-OH⁻ NaOH, LiOH, KOH
Weak electrolytes - correct answer-Mostly weak acids, compounds that don't dissolve
completely in water
