StraighterLine CHEM101 Final Exam Questions and
Correct Answers| Latest Update
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
ions
atoms with charge formed by loss or gain of an electron
Correct Answers| Latest Update
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
ions
atoms with charge formed by loss or gain of an electron
