CHM101 Exam 1 (NEW 2025/ 2026 Update)
Introduction to General, Organic, and
Biochemistry Questions & Answers {Grade
A} 100% Correct (Verified Solutions)- GCU
Dalton's Atomic Theory - correct answer 1) Each element is composed of tiny,
indestructible particles called atoms
2) All stoms of a given element have the same mass and other properties that
distinguish them from the atoms of other elements
3) Atoms combine in simple, whole-number ratios to form compounds
4) Atoms of one element cannot change into atoms of another element. In a chemical
reaction, atoms only change the way that they are bound together with other atoms
Precision - correct answer How reproducible; how close the measurements are to
each other
Accuracy - correct answer How close the measurements are to the true value
Multiplication and Division with Sig Figs - correct answer Always use the amount of
sig figs that are in the number with the lowest amount of sig figs
Ex. 4.56cm x 1.4cm = 6.4cm squared (2 sig figs from 1.4cm)
Addition and Subtraction with Sig Figs - correct answer Always use the same amount
of sig figs as the number with the smallest amount of decimal places
Ex. 12.11cm + 18.0cm + 1.013cm = 31.1cm (1 decimal place from 18.0cm)
,CHM101 Exam 1 (NEW 2025/ 2026 Update)
Introduction to General, Organic, and
Biochemistry Questions & Answers {Grade
A} 100% Correct (Verified Solutions)- GCU
Marie Curie - correct answer Discovered radioactivity (the emission of small energetic
particles from the core of certain unstable atoms) at the end of the 19th century.
Provided evidence of subatomic particles.
J.J Thomson - correct answer Constructed a glass tube called a cathode ray that was
partially evacuated and then applied a high electrical voltage between two electrodes
at either end of the tube. Thomson found that a beam of particles, called cathode
rays, traveled from the neg side to the pos side. J.J. Thomson measured the charge-
to-mass ratio of the cathode ray particlesy by deflecting them using electric and
magnetic fields. J.J. Thomson had discovered the electron.
Milliken's Oil Drop Experiment - correct answer Determined the charge of the
electron and used it to figure out the weight of an electron using J.J. Thomson's
charge-to-mass ratio. Sprayed neg charged oil into small droplets into a evacuated
container. As the droplets came across the positive plate and went down the hole in
the center of the plate they would be held still between the pos and neg plates.
Rutherford's Gold Foil Experiment - correct answer Indicated that particles of atoms
are mostly empty space (why most of them went through) but also that the nucleus
(of the gold) was small and positively charged (deflected some particles).
, CHM101 Exam 1 (NEW 2025/ 2026 Update)
Introduction to General, Organic, and
Biochemistry Questions & Answers {Grade
A} 100% Correct (Verified Solutions)- GCU
Average Atomic Mass - correct answer Average of the natural occuring isotopes
found in nature. Problems will be given with a variety of isotopes and their mass in
amu and percent of natural abundance. Convert the percent of natural abundacne
into decimal form by dividing by 100. Multiply that number by the amu given and
add all of the isotopes together.
Ions and the Periodic Table - correct answer A main-group metal tends to lose
electrons, forming a cation with the same number of electrons as the nearest noble
gas.
-Charge -1: He⁻, F⁻, Cl⁻, Br⁻, I⁻
-Charge -2: O²⁻, S²⁻, Se²⁻, Te²⁻
-Charge -3: N³⁻
A main-group nonmetal tends to gain electrons, forming an anion with the same
number of electrons as the nearest noble gas
-Charge +1: H⁺, Li⁺, Na⁺, K⁺, Rb⁺, Cs⁺
-Charge +2: Mg²⁺, Ca²⁺, Sr²⁺, Ba²⁺
Avogadro's Number - correct answer 1 mole = 6.02214 x 10²³ of anything
Molecular to Empirical Formula - correct answer Divide the subscripts by the greatest
common factor
Introduction to General, Organic, and
Biochemistry Questions & Answers {Grade
A} 100% Correct (Verified Solutions)- GCU
Dalton's Atomic Theory - correct answer 1) Each element is composed of tiny,
indestructible particles called atoms
2) All stoms of a given element have the same mass and other properties that
distinguish them from the atoms of other elements
3) Atoms combine in simple, whole-number ratios to form compounds
4) Atoms of one element cannot change into atoms of another element. In a chemical
reaction, atoms only change the way that they are bound together with other atoms
Precision - correct answer How reproducible; how close the measurements are to
each other
Accuracy - correct answer How close the measurements are to the true value
Multiplication and Division with Sig Figs - correct answer Always use the amount of
sig figs that are in the number with the lowest amount of sig figs
Ex. 4.56cm x 1.4cm = 6.4cm squared (2 sig figs from 1.4cm)
Addition and Subtraction with Sig Figs - correct answer Always use the same amount
of sig figs as the number with the smallest amount of decimal places
Ex. 12.11cm + 18.0cm + 1.013cm = 31.1cm (1 decimal place from 18.0cm)
,CHM101 Exam 1 (NEW 2025/ 2026 Update)
Introduction to General, Organic, and
Biochemistry Questions & Answers {Grade
A} 100% Correct (Verified Solutions)- GCU
Marie Curie - correct answer Discovered radioactivity (the emission of small energetic
particles from the core of certain unstable atoms) at the end of the 19th century.
Provided evidence of subatomic particles.
J.J Thomson - correct answer Constructed a glass tube called a cathode ray that was
partially evacuated and then applied a high electrical voltage between two electrodes
at either end of the tube. Thomson found that a beam of particles, called cathode
rays, traveled from the neg side to the pos side. J.J. Thomson measured the charge-
to-mass ratio of the cathode ray particlesy by deflecting them using electric and
magnetic fields. J.J. Thomson had discovered the electron.
Milliken's Oil Drop Experiment - correct answer Determined the charge of the
electron and used it to figure out the weight of an electron using J.J. Thomson's
charge-to-mass ratio. Sprayed neg charged oil into small droplets into a evacuated
container. As the droplets came across the positive plate and went down the hole in
the center of the plate they would be held still between the pos and neg plates.
Rutherford's Gold Foil Experiment - correct answer Indicated that particles of atoms
are mostly empty space (why most of them went through) but also that the nucleus
(of the gold) was small and positively charged (deflected some particles).
, CHM101 Exam 1 (NEW 2025/ 2026 Update)
Introduction to General, Organic, and
Biochemistry Questions & Answers {Grade
A} 100% Correct (Verified Solutions)- GCU
Average Atomic Mass - correct answer Average of the natural occuring isotopes
found in nature. Problems will be given with a variety of isotopes and their mass in
amu and percent of natural abundance. Convert the percent of natural abundacne
into decimal form by dividing by 100. Multiply that number by the amu given and
add all of the isotopes together.
Ions and the Periodic Table - correct answer A main-group metal tends to lose
electrons, forming a cation with the same number of electrons as the nearest noble
gas.
-Charge -1: He⁻, F⁻, Cl⁻, Br⁻, I⁻
-Charge -2: O²⁻, S²⁻, Se²⁻, Te²⁻
-Charge -3: N³⁻
A main-group nonmetal tends to gain electrons, forming an anion with the same
number of electrons as the nearest noble gas
-Charge +1: H⁺, Li⁺, Na⁺, K⁺, Rb⁺, Cs⁺
-Charge +2: Mg²⁺, Ca²⁺, Sr²⁺, Ba²⁺
Avogadro's Number - correct answer 1 mole = 6.02214 x 10²³ of anything
Molecular to Empirical Formula - correct answer Divide the subscripts by the greatest
common factor
