PHYSICAL SCIENCE END SEMESTER FINAL EXAM
REVISION QUESTIONS FOR 2024. ALL EXAM REVISION
QUESTIONS AND CORRECT ANSWERS (ALREADY GRADED
A+) (2024 UPDATE)
A sample of a solid nonmetal is compared to a sample of a solid metal. Both samples have the
same volume. What is the most likely difference between the two samples? - ANSWER- C.
The metal has more mass.
Which is an example of a chemical change? - ANSWER- A.
frying an egg
Rounded to the nearest whole number, what is the atomic mass of platinum? - ANSWER- C.
195
During a camping trip, Sierra collected dry branches and broke them into smaller pieces. She then
placed the sticks in a fire pit and used a match to light the sticks on fire. Next, she propped a metal
pan of water over the fire and heated it until the water boiled.
Which list correctly describes physical and chemical changes that occurred in this scenario? -
ANSWER- D.
physical changes: breaking sticks, boiling water
chemical change: lighting the fire
,Work can ____ energy between objects and can cause a change in the form of energy. - ANSWER-
transfer
Which best describes what all of the observations have in common? - ANSWER- D.
They involve changes in energy.
The sun emits electromagnetic waves at many frequencies, but mostly in the infrared, visible, and
ultraviolet spectrums. What kind of energy is this? - ANSWER- B.
radiant
______ energy is the energy an object has because of its motion. - ANSWER- Kinetic
What kind of energy involves the flow of positive charges? - ANSWER- C.
electrical
When a spring is compressed, the energy changes from kinetic to potential. Which best describes
what is causing this change? - ANSWER- A.
work
Which statement best describes the work and energy in these examples?
Example 1: Running a car requires gas.
Example 2: Humans require food to live. - ANSWER- A.
The gas and food are examples of energy.
What are two forms of mechanical energy? - ANSWER- NOT A.
,electrical and kinetic
Which statement best defines the relationship between work and energy? - ANSWER- not d.
Work can transfer energy between objects and cause a change in the amount of total energy.
The amount of kinetic energy an object has depends on its ___. - ANSWER- motion
An object has a velocity of 8 m/s and a kinetic energy of 480 J. What is the mass of the object? -
ANSWER- B.
15 kg
Which statement correctly describes whether a compound is a pure substance? - ANSWER- B.
A compound is a pure substance because its molecule cannot be broken down into simpler particles
by physical means.
Which statements describe how chemical formulas, such as H2O, represent compounds? Check
all that apply. - ANSWER- They show the elements that make up a compound.
They show the types of atoms that make up a molecule.
They show the number of each type of atom in a molecule.
What does the 4 mean in the formula 4Na2SO3? - ANSWER- C.
There are four molecules of sodium sulfite.
How many atoms of each element are in 4Na3PO4? - ANSWER- D.
12 sodium, 4 phosphorus, 16 oxygen
, In what way is Model A better than Model B? - ANSWER- C.
Model A shows the three-dimensional shape of the molecule, but Model B does not.
What is the chemical formula for the molecule modeled? - ANSWER- C.
C6H12O2
What does the chemical formula CaCl2 show about the compound it represents? - ANSWER-
B.
It is made up of two elements.
How many atoms of nitrogen are in the chemical formula Ni(NO3)2? - ANSWER- A.
2
Elena makes the table below to determine the number of atoms of each element in the chemical
formula 3(NH4)2SO4.
What mistake did Elena make? - ANSWER- A.
She should not have multiplied the sulfur atoms by the subscript 4.
The compound magnesium phosphate has the chemical formula Mg3(PO4)2. In this compound,
phosphorous and oxygen act together as one charged particle, which is connected to magnesium,
the other charged particle.
What does the 2 mean in the formula 5Mg3(PO4)2? - ANSWER- D.
There are two phosphate ions in a molecule of magnesium phosphate.
REVISION QUESTIONS FOR 2024. ALL EXAM REVISION
QUESTIONS AND CORRECT ANSWERS (ALREADY GRADED
A+) (2024 UPDATE)
A sample of a solid nonmetal is compared to a sample of a solid metal. Both samples have the
same volume. What is the most likely difference between the two samples? - ANSWER- C.
The metal has more mass.
Which is an example of a chemical change? - ANSWER- A.
frying an egg
Rounded to the nearest whole number, what is the atomic mass of platinum? - ANSWER- C.
195
During a camping trip, Sierra collected dry branches and broke them into smaller pieces. She then
placed the sticks in a fire pit and used a match to light the sticks on fire. Next, she propped a metal
pan of water over the fire and heated it until the water boiled.
Which list correctly describes physical and chemical changes that occurred in this scenario? -
ANSWER- D.
physical changes: breaking sticks, boiling water
chemical change: lighting the fire
,Work can ____ energy between objects and can cause a change in the form of energy. - ANSWER-
transfer
Which best describes what all of the observations have in common? - ANSWER- D.
They involve changes in energy.
The sun emits electromagnetic waves at many frequencies, but mostly in the infrared, visible, and
ultraviolet spectrums. What kind of energy is this? - ANSWER- B.
radiant
______ energy is the energy an object has because of its motion. - ANSWER- Kinetic
What kind of energy involves the flow of positive charges? - ANSWER- C.
electrical
When a spring is compressed, the energy changes from kinetic to potential. Which best describes
what is causing this change? - ANSWER- A.
work
Which statement best describes the work and energy in these examples?
Example 1: Running a car requires gas.
Example 2: Humans require food to live. - ANSWER- A.
The gas and food are examples of energy.
What are two forms of mechanical energy? - ANSWER- NOT A.
,electrical and kinetic
Which statement best defines the relationship between work and energy? - ANSWER- not d.
Work can transfer energy between objects and cause a change in the amount of total energy.
The amount of kinetic energy an object has depends on its ___. - ANSWER- motion
An object has a velocity of 8 m/s and a kinetic energy of 480 J. What is the mass of the object? -
ANSWER- B.
15 kg
Which statement correctly describes whether a compound is a pure substance? - ANSWER- B.
A compound is a pure substance because its molecule cannot be broken down into simpler particles
by physical means.
Which statements describe how chemical formulas, such as H2O, represent compounds? Check
all that apply. - ANSWER- They show the elements that make up a compound.
They show the types of atoms that make up a molecule.
They show the number of each type of atom in a molecule.
What does the 4 mean in the formula 4Na2SO3? - ANSWER- C.
There are four molecules of sodium sulfite.
How many atoms of each element are in 4Na3PO4? - ANSWER- D.
12 sodium, 4 phosphorus, 16 oxygen
, In what way is Model A better than Model B? - ANSWER- C.
Model A shows the three-dimensional shape of the molecule, but Model B does not.
What is the chemical formula for the molecule modeled? - ANSWER- C.
C6H12O2
What does the chemical formula CaCl2 show about the compound it represents? - ANSWER-
B.
It is made up of two elements.
How many atoms of nitrogen are in the chemical formula Ni(NO3)2? - ANSWER- A.
2
Elena makes the table below to determine the number of atoms of each element in the chemical
formula 3(NH4)2SO4.
What mistake did Elena make? - ANSWER- A.
She should not have multiplied the sulfur atoms by the subscript 4.
The compound magnesium phosphate has the chemical formula Mg3(PO4)2. In this compound,
phosphorous and oxygen act together as one charged particle, which is connected to magnesium,
the other charged particle.
What does the 2 mean in the formula 5Mg3(PO4)2? - ANSWER- D.
There are two phosphate ions in a molecule of magnesium phosphate.
