StraighterLine CHEM101 Final Exam Complete Study
Guide, Practice Questions & Comprehensive Exam
Prep 2026–2027
Mass Number - correct answers -total number of neutrons and protons in an atom; # protons + #
electrons
p - correct answers -Most nonmetallic elements are found in which block of the periodic table?
Positive matter is concentrated in the central core - correct answers -Ernest Rutherford disproved J.J.
Thomson's plum-pudding model of the atom by showing that...
Potassium - correct answers -Plants use up copious amounts of which alkali metal, preventing most of it
from being washed out to sea?
2:1:1:2 - correct answers -What is the ratio of reactants and products in the chemical equation?
__NaOH + __H2SO4 --> __Na2SO4 + __H2O
the number of ATOMS in 12g of Carbon-12
1 g = 6.022 × 1023 amu - correct answers -What is Avogadro's number?
Mg - correct answers -What is the reducing agent in the following equation?
Mg(s) + 2HCl(aq) -> MgCl2(aq) + H2(g)
1
,(s) < (l) < (g) - correct answers -Which arrangement accurately describes the standard entropy values at
different phases?
2, 8, 20, 50, 82 or 126 protons - correct answers -What are the most stable isotopes?
S = oxidized
N = reduced - correct answers -What element has been oxidized and what element has been reduced?
3CuS + 8HNO3 --> 3CuSO4 + 8NO + 4H2O
multiply the atomic mass (grams) by the number of moles - correct answers -How do you convert from
moles to grams?
Divide the total number of grams by the atomic mass (grams) of 1 mole - correct answers -How do you
convert from grams to moles?
Mass - correct answers -measure of the amount of matter
Compound - correct answers -made from atoms of 2+ elements that are chemically bonded; cannot be
separated into simpler substances by any physical process; can be separated by a chemical reaction
Solid - correct answers -Definite shape and volume
Doesn't conform to shape of container
Particles are very close together in orderly fashion with little freedom of motion
2
,Liquid - correct answers -Definite volume, indefinite shape
Conforms to shape of the part of the container it fills
Particles are close together but not rigidly in position with freedom to move past each other
Gas - correct answers -No definite shape or volume
Conforms to shape and volume of container
Particles separated by distances very large compared to size of particles
Physical Property - correct answers -Color, melting point, boiling point
Observed and measured without changing identity of substance
Chemical Property - correct answers -Observed by performing a chemical change
Mixture - correct answers -Combination of 2+ elements, each retains its identity and properties
Can be separated by physical means into pure components without changing identity of compounds
Pure Substance - correct answers -fixed composition and differs from a mixture (every sample has same
properties and composition)
Polyatomic Ion - correct answers -molecule with a charge
contain more than 1 atom chemically bonded together
3
, ions - correct answers -atoms with charge formed by loss or gain of an electron
Cation - correct answers -positive ion, may have roman numeral
Anion - correct answers -negative ion, element ends in -ide
isotope - correct answers -atom of an element that has a different mass because of a different number
of neutrons, but same atomic number
Atomic Number - correct answers -total number of protons in an atom; also indicates number of
electrons
Catalyst - correct answers -additional reactant that increases the rate of a reaction with a lower
activation energy
Surface area
Concentration
Temperature
Catalyst - correct answers -What 4 factors impact the rate of a reaction?
exothermic reaction - correct answers -A reaction that RELEASES energy in the form of heat
endothermic reaction - correct answers -A reaction that ABSORBS energy in the form of heat
4
Guide, Practice Questions & Comprehensive Exam
Prep 2026–2027
Mass Number - correct answers -total number of neutrons and protons in an atom; # protons + #
electrons
p - correct answers -Most nonmetallic elements are found in which block of the periodic table?
Positive matter is concentrated in the central core - correct answers -Ernest Rutherford disproved J.J.
Thomson's plum-pudding model of the atom by showing that...
Potassium - correct answers -Plants use up copious amounts of which alkali metal, preventing most of it
from being washed out to sea?
2:1:1:2 - correct answers -What is the ratio of reactants and products in the chemical equation?
__NaOH + __H2SO4 --> __Na2SO4 + __H2O
the number of ATOMS in 12g of Carbon-12
1 g = 6.022 × 1023 amu - correct answers -What is Avogadro's number?
Mg - correct answers -What is the reducing agent in the following equation?
Mg(s) + 2HCl(aq) -> MgCl2(aq) + H2(g)
1
,(s) < (l) < (g) - correct answers -Which arrangement accurately describes the standard entropy values at
different phases?
2, 8, 20, 50, 82 or 126 protons - correct answers -What are the most stable isotopes?
S = oxidized
N = reduced - correct answers -What element has been oxidized and what element has been reduced?
3CuS + 8HNO3 --> 3CuSO4 + 8NO + 4H2O
multiply the atomic mass (grams) by the number of moles - correct answers -How do you convert from
moles to grams?
Divide the total number of grams by the atomic mass (grams) of 1 mole - correct answers -How do you
convert from grams to moles?
Mass - correct answers -measure of the amount of matter
Compound - correct answers -made from atoms of 2+ elements that are chemically bonded; cannot be
separated into simpler substances by any physical process; can be separated by a chemical reaction
Solid - correct answers -Definite shape and volume
Doesn't conform to shape of container
Particles are very close together in orderly fashion with little freedom of motion
2
,Liquid - correct answers -Definite volume, indefinite shape
Conforms to shape of the part of the container it fills
Particles are close together but not rigidly in position with freedom to move past each other
Gas - correct answers -No definite shape or volume
Conforms to shape and volume of container
Particles separated by distances very large compared to size of particles
Physical Property - correct answers -Color, melting point, boiling point
Observed and measured without changing identity of substance
Chemical Property - correct answers -Observed by performing a chemical change
Mixture - correct answers -Combination of 2+ elements, each retains its identity and properties
Can be separated by physical means into pure components without changing identity of compounds
Pure Substance - correct answers -fixed composition and differs from a mixture (every sample has same
properties and composition)
Polyatomic Ion - correct answers -molecule with a charge
contain more than 1 atom chemically bonded together
3
, ions - correct answers -atoms with charge formed by loss or gain of an electron
Cation - correct answers -positive ion, may have roman numeral
Anion - correct answers -negative ion, element ends in -ide
isotope - correct answers -atom of an element that has a different mass because of a different number
of neutrons, but same atomic number
Atomic Number - correct answers -total number of protons in an atom; also indicates number of
electrons
Catalyst - correct answers -additional reactant that increases the rate of a reaction with a lower
activation energy
Surface area
Concentration
Temperature
Catalyst - correct answers -What 4 factors impact the rate of a reaction?
exothermic reaction - correct answers -A reaction that RELEASES energy in the form of heat
endothermic reaction - correct answers -A reaction that ABSORBS energy in the form of heat
4
