CHEM1020 Final Exam 2025/2026 Exam
Questions and Answers | A+ Score
Assured
A substance that can be broken down into two or more simpler substances
by chemical methods is called a(n) - 🧠 ANSWER ✔✔compound
Which diagram(s) best represent(s) only molecules? - 🧠 ANSWER ✔✔I and
II only
How many bromide ions can combine with one ion of aluminum to form an
ionic compound? - 🧠 ANSWER ✔✔3
Which is not a pure substance? - 🧠 ANSWER ✔✔Air
Which country is the world's leading producer of rare earth elements? - 🧠
ANSWER ✔✔China
,The majority of new smartphones being released have displays that are at
least 5 inches in size. What is this size in centimeters? (There are 2.54 cm
in one inch.) - 🧠 ANSWER ✔✔12.7 cm
The most numerous of the elements are the - 🧠 ANSWER ✔✔metals
How many protons are in an atom of carbon? - 🧠 ANSWER ✔✔6
Oxidation and reduction of atoms involves a change in the number of
___________ in the atom. - 🧠 ANSWER ✔✔electrons
The numbers 1 through 4 are used to identify four different elements on the
periodic table. Which element is expected to have 2+ charge when it forms
an ion? - 🧠 ANSWER ✔✔1
Which is not a mixture? - 🧠 ANSWER ✔✔sodium chloride
Which diagram(s) best represent(s) only individual atoms? - 🧠 ANSWER
✔✔III only
Choose the proper coefficients for each substance to balance this equation.
____ C2H4(g) + ____ O2(g) → ____ CO2(g) + ____ H2O(g) - 🧠 ANSWER
✔✔1, 3, 2, 2
, Currently, the primary source of sulfur dioxide emissions into the
atmosphere is - 🧠 ANSWER ✔✔coal burning power plants
Choose the proper coefficients for each substance to yield a balanced
equation - 🧠 ANSWER ✔✔2, 1, 2
Which of the following would be described as "fine particles"? - 🧠 ANSWER
✔✔2.5 µmeter diameter soot
What is the chemical formula for carbon disulfide? - 🧠 ANSWER ✔✔CS2
The name of the compound formed by combining carbon atoms with
oxygen atoms to form (O)(C)(O) is - 🧠 ANSWER ✔✔carbon dioxide
In metropolitan areas, the concentration of ozone in the atmosphere drops
at night. Why? - 🧠 ANSWER ✔✔the formation of ozone requires sunlight
The burning of coal produces sulfur dioxide, SO2, a pollutant that slowly
reacts in air to form SO3. Sulfur trioxide dissolves into airborne water
droplets to form a very corrosive solution of sulfuric acid. Which is a
product of burning coal that hastens the transformation of sulfur dioxide into
sulfur trioxide? - 🧠 ANSWER ✔✔particles of ash
COPYRIGHT©NINJANERD 2025/2026. YEAR PUBLISHED 2025. COMPANY REGISTRATION NUMBER: 619652435. TERMS OF USE. PRIVACY
STATEMENT. ALL RIGHTS RESERVED
3
Questions and Answers | A+ Score
Assured
A substance that can be broken down into two or more simpler substances
by chemical methods is called a(n) - 🧠 ANSWER ✔✔compound
Which diagram(s) best represent(s) only molecules? - 🧠 ANSWER ✔✔I and
II only
How many bromide ions can combine with one ion of aluminum to form an
ionic compound? - 🧠 ANSWER ✔✔3
Which is not a pure substance? - 🧠 ANSWER ✔✔Air
Which country is the world's leading producer of rare earth elements? - 🧠
ANSWER ✔✔China
,The majority of new smartphones being released have displays that are at
least 5 inches in size. What is this size in centimeters? (There are 2.54 cm
in one inch.) - 🧠 ANSWER ✔✔12.7 cm
The most numerous of the elements are the - 🧠 ANSWER ✔✔metals
How many protons are in an atom of carbon? - 🧠 ANSWER ✔✔6
Oxidation and reduction of atoms involves a change in the number of
___________ in the atom. - 🧠 ANSWER ✔✔electrons
The numbers 1 through 4 are used to identify four different elements on the
periodic table. Which element is expected to have 2+ charge when it forms
an ion? - 🧠 ANSWER ✔✔1
Which is not a mixture? - 🧠 ANSWER ✔✔sodium chloride
Which diagram(s) best represent(s) only individual atoms? - 🧠 ANSWER
✔✔III only
Choose the proper coefficients for each substance to balance this equation.
____ C2H4(g) + ____ O2(g) → ____ CO2(g) + ____ H2O(g) - 🧠 ANSWER
✔✔1, 3, 2, 2
, Currently, the primary source of sulfur dioxide emissions into the
atmosphere is - 🧠 ANSWER ✔✔coal burning power plants
Choose the proper coefficients for each substance to yield a balanced
equation - 🧠 ANSWER ✔✔2, 1, 2
Which of the following would be described as "fine particles"? - 🧠 ANSWER
✔✔2.5 µmeter diameter soot
What is the chemical formula for carbon disulfide? - 🧠 ANSWER ✔✔CS2
The name of the compound formed by combining carbon atoms with
oxygen atoms to form (O)(C)(O) is - 🧠 ANSWER ✔✔carbon dioxide
In metropolitan areas, the concentration of ozone in the atmosphere drops
at night. Why? - 🧠 ANSWER ✔✔the formation of ozone requires sunlight
The burning of coal produces sulfur dioxide, SO2, a pollutant that slowly
reacts in air to form SO3. Sulfur trioxide dissolves into airborne water
droplets to form a very corrosive solution of sulfuric acid. Which is a
product of burning coal that hastens the transformation of sulfur dioxide into
sulfur trioxide? - 🧠 ANSWER ✔✔particles of ash
COPYRIGHT©NINJANERD 2025/2026. YEAR PUBLISHED 2025. COMPANY REGISTRATION NUMBER: 619652435. TERMS OF USE. PRIVACY
STATEMENT. ALL RIGHTS RESERVED
3
