CHEM 175 - General Chemistry | Atomic Theory
Qs & Complete Ans | Ultimate Study Guide for
Yr. 2026/2027 | Cumulative Exam.
Which scientist’s law about the ratios of masses of elements in a compound did John Dalton’s work on the
atomic structure help to explain?
Democritus
J. J. Thomson
Ernest Rutherford
Joseph Proust
The diagrams show gases that are stored in two separate but similar containers.
If both gases are at the same temperature, which one has the greater pressure?
gas 1 because the particles are moving much faster
gas 1 because it has fewer particles that are close together
gas 2 because it has more particles that are colliding
gas 2 because the particles have more space between them
The following balanced equation shows the formation of sulfur dioxide.
S + O2 SO2
How many moles of sulfur are needed to produce 15.0 mol of sulfur dioxide?
7.50 mol
10.5 mol
15.0 mol
30.0 mol
Rachel is performing an acid-base titration. She hopes to determine the concentration of an unknown acid
solution to two decimal places.
Which is the best tool to find the volume of the base that she needs to neutralize the acid?
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, beaker
Erlenmeyer flask
graduated cylinder
buret
Anita is comparing the accepted value for a physical property to the value she measured in the laboratory.
Which characteristic of her measured value is Anita most likely trying to evaluate?
accuracy
mean
precision
range
An electron in a hydrogen atom moves from level 3 to level 1. In a second hydrogen atom, an electron
drops from level 2 to level 1. Which statement describes the most likely result?
The first atom emits light with more energy.
The second atom emits light with more energy.
The first and second atoms absorb energy without emitting light.
The first and second atoms emit light with the same amount of energy.
Sodium combines with water to produce sodium hydroxide and hydrogen gas. Which word equation
represents this violent reaction?
sodium hydroxide + water sodium + hydrogen
sodium + water sodium hydroxide + hydrogen
sodium + hydrogen sodium hydroxide + water
sodium + sodium hydroxide water + hydrogen
Which of the following observations would indicate that a material is a pure substance?
It does not dissolve in water.
It changes color after heating.
It cannot be physically broken down into different types of atoms.
It can be physically broken down into different types of molecules.
Which commercial technology commonly uses plasmas?
a radio a
race car
a television a
microwave oven
What is the empirical formula for propene (C3H6)?
C2H4
C4H8
C3H6
CH2
Which action do researchers take to make advances in science?
They guard their findings against the scrutiny of outside sources.
They share their experimental results with other researchers.
They reduce their participation in working with other scientists.
They announce their findings in newspapers to avoid peer review.
To explain the photoelectric effect, Albert Einstein linked the photoelectric effect to an idea from which
scientist?
2 of 5 15/12/2025, 15
Qs & Complete Ans | Ultimate Study Guide for
Yr. 2026/2027 | Cumulative Exam.
Which scientist’s law about the ratios of masses of elements in a compound did John Dalton’s work on the
atomic structure help to explain?
Democritus
J. J. Thomson
Ernest Rutherford
Joseph Proust
The diagrams show gases that are stored in two separate but similar containers.
If both gases are at the same temperature, which one has the greater pressure?
gas 1 because the particles are moving much faster
gas 1 because it has fewer particles that are close together
gas 2 because it has more particles that are colliding
gas 2 because the particles have more space between them
The following balanced equation shows the formation of sulfur dioxide.
S + O2 SO2
How many moles of sulfur are needed to produce 15.0 mol of sulfur dioxide?
7.50 mol
10.5 mol
15.0 mol
30.0 mol
Rachel is performing an acid-base titration. She hopes to determine the concentration of an unknown acid
solution to two decimal places.
Which is the best tool to find the volume of the base that she needs to neutralize the acid?
1 of 5 15/12/2025, 15
, beaker
Erlenmeyer flask
graduated cylinder
buret
Anita is comparing the accepted value for a physical property to the value she measured in the laboratory.
Which characteristic of her measured value is Anita most likely trying to evaluate?
accuracy
mean
precision
range
An electron in a hydrogen atom moves from level 3 to level 1. In a second hydrogen atom, an electron
drops from level 2 to level 1. Which statement describes the most likely result?
The first atom emits light with more energy.
The second atom emits light with more energy.
The first and second atoms absorb energy without emitting light.
The first and second atoms emit light with the same amount of energy.
Sodium combines with water to produce sodium hydroxide and hydrogen gas. Which word equation
represents this violent reaction?
sodium hydroxide + water sodium + hydrogen
sodium + water sodium hydroxide + hydrogen
sodium + hydrogen sodium hydroxide + water
sodium + sodium hydroxide water + hydrogen
Which of the following observations would indicate that a material is a pure substance?
It does not dissolve in water.
It changes color after heating.
It cannot be physically broken down into different types of atoms.
It can be physically broken down into different types of molecules.
Which commercial technology commonly uses plasmas?
a radio a
race car
a television a
microwave oven
What is the empirical formula for propene (C3H6)?
C2H4
C4H8
C3H6
CH2
Which action do researchers take to make advances in science?
They guard their findings against the scrutiny of outside sources.
They share their experimental results with other researchers.
They reduce their participation in working with other scientists.
They announce their findings in newspapers to avoid peer review.
To explain the photoelectric effect, Albert Einstein linked the photoelectric effect to an idea from which
scientist?
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