Straighterline CHEM101 Final Questions and
Correct Answers
Mass Number
✓ ~~~ total number of neutrons and protons in an atom; # protons + # electrons
p
✓ ~~~ Most nonmetallic elements are found in which block of the periodic table?
Positive matter is concentrated in the central core
✓ ~~~ Ernest Rutherford disproved J.J. Thomson's plum-pudding model of the atom
by showing that...
Potassium
✓ ~~~ Plants use up copious amounts of which alkali metal, preventing most of it from
being washed out to sea?
2:1:1:2
✓ ~~~ 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
, ✓ ~~~ What is Avogadro's number?
Mg
✓ ~~~ What is the reducing agent in the following equation?
Mg(s) + 2HCl(aq) -> MgCl2(aq) + H2(g)
(s) < (l) < (g)
✓ ~~~ Which arrangement accurately describes the standard entropy values at
different phases?
2, 8, 20, 50, 82 or 126 protons
✓ ~~~ What are the most stable isotopes?
S = oxidized
N = reduced
✓ ~~~ 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
✓ ~~~ How do you convert from moles to grams?
,Divide the total number of grams by the atomic mass (grams) of 1 mole
✓ ~~~ How do you convert from grams to moles?
Mass
✓ ~~~ measure of the amount of matter
Compound
✓ ~~~ 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
✓ ~~~ Definite shape and volume
Doesn't conform to shape of container
Particles are very close together in orderly fashion with little freedom of motion
Liquid
✓ ~~~ 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
, ✓ ~~~ 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
✓ ~~~ Color, melting point, boiling point
Observed and measured without changing identity of substance
Chemical Property
✓ ~~~ Observed by performing a chemical change
Mixture
✓ ~~~ 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
✓ ~~~ fixed composition and differs from a mixture (every sample has same properties
and composition)
Polyatomic Ion
✓ ~~~ molecule with a charge
contain more than 1 atom chemically bonded together
Correct Answers
Mass Number
✓ ~~~ total number of neutrons and protons in an atom; # protons + # electrons
p
✓ ~~~ Most nonmetallic elements are found in which block of the periodic table?
Positive matter is concentrated in the central core
✓ ~~~ Ernest Rutherford disproved J.J. Thomson's plum-pudding model of the atom
by showing that...
Potassium
✓ ~~~ Plants use up copious amounts of which alkali metal, preventing most of it from
being washed out to sea?
2:1:1:2
✓ ~~~ 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
, ✓ ~~~ What is Avogadro's number?
Mg
✓ ~~~ What is the reducing agent in the following equation?
Mg(s) + 2HCl(aq) -> MgCl2(aq) + H2(g)
(s) < (l) < (g)
✓ ~~~ Which arrangement accurately describes the standard entropy values at
different phases?
2, 8, 20, 50, 82 or 126 protons
✓ ~~~ What are the most stable isotopes?
S = oxidized
N = reduced
✓ ~~~ 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
✓ ~~~ How do you convert from moles to grams?
,Divide the total number of grams by the atomic mass (grams) of 1 mole
✓ ~~~ How do you convert from grams to moles?
Mass
✓ ~~~ measure of the amount of matter
Compound
✓ ~~~ 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
✓ ~~~ Definite shape and volume
Doesn't conform to shape of container
Particles are very close together in orderly fashion with little freedom of motion
Liquid
✓ ~~~ 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
, ✓ ~~~ 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
✓ ~~~ Color, melting point, boiling point
Observed and measured without changing identity of substance
Chemical Property
✓ ~~~ Observed by performing a chemical change
Mixture
✓ ~~~ 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
✓ ~~~ fixed composition and differs from a mixture (every sample has same properties
and composition)
Polyatomic Ion
✓ ~~~ molecule with a charge
contain more than 1 atom chemically bonded together
