NATURAL SCIENCE (PRACTICE
QUESTIONS) EXAM GUIDE WITH
CORRECT ANSWERS
What type of compound is formed by the combination of two or more non-metallic
elements with one another?
(a) organic
(b) ionic
(c) covalent
(d) chemical - ANSWER-(c) covalent
Which of the following descriptions of Lewis dot structure is NOT correct?
(a) they show the bonding between atoms of a molecule
(b) they they show all the electrons of each atom of a molecule
(c) the total number of electrons is equal to the sum of the number of valance electrons
on each atom
(d) they show any lone pairs of electrons that may exist in a molecule that are not
bonded to another atom - ANSWER-(b) they they show all the electrons of each atom of
a molecule
Which of the following does NOT describe a carboxyl group correctly?
(a) a carbon atom attached to an oxygen atom by a double bond and to a hydroxyl
group by a single bond.
(b) a carbonyl group bonded to a hydroxyl group.
(c) a set of four atoms bonded together and abbreviated as C02H.
(d) a carbon atom attached to a hydrogen atom by a double bond and to an oxygen
atom by a double bond. - ANSWER-(d) a carbon atom attached to a hydrogen atom by
a double bond and to an oxygen atom by a double bond.
A gas is held in a closed container and held at constant temperature. What is the effect
of increasing the volume of the container by 3 times?
(a) the pressure is tripled
(b) the pressure increases to one third
(c) the pressure decreases to one third
(d) the pressure remains constant - ANSWER-(c) the pressure decreases to one third
Use the following information to answer question.
, Four identical liquid samples inside of identical sealed containers initially at room
temperature were placed in four isolated environments, each with its own maintained
temperature. After each liquid sample is allowed sufficient time to assume the
temperature of its environment, the samples changed as follows: In sample A, the liquid
vaporizes and is now a gas. In sample B, the liquid is boiling. In sample C, the liquid is
now a solid. In sample D, the liquid remains as a liquid.
Which sample's container has the greatest pressure?
(a) sample A
(b) sample B
(c) sample C
(d) sample D - ANSWER-(a) sample A
Use the following information to answer question.
Four identical liquid samples inside of identical sealed containers initially at room
temperature were placed in four isolated environments, each with its own maintained
temperature. After each liquid sample is allowed sufficient time to assume the
temperature of its environment, the samples changed as follows: In sample A, the liquid
vaporizes and is now a gas. In sample B, the liquid is boiling. In sample C, the liquid is
now a solid. In sample D, the liquid remains as a liquid.
If the temperature in each environment were increased by 10 degrees Celsius and each
sample were allowed time to assume the new temperature, which of the following
events is MOST likely to occur?
(a) sample A would become a liquid
(b) sample B would become a gas
(c) sample D would begin to boil
(d) None of these are likely to occur - ANSWER-(b) sample B would become a gas
Which statement best describes the molecular arrangement of a liquid crystal?
(a) the molecular arrangement is random in some directions and regular in others.
(b) the molecular arrangement is a regularly, repeating pattern in all directions.
(c) the molecular arrangement is random in all directions.
(d) the molecular arrangement is reduced to one layer with a random pattern. -
ANSWER-(a) the molecular arrangement is random in some directions and regular in
others.
Which of the following is not true of a chemical reaction?
(a) matter is never gained or lost
(b) heat may be absorbed or released
(c) the rate of the reaction increases with temperature
QUESTIONS) EXAM GUIDE WITH
CORRECT ANSWERS
What type of compound is formed by the combination of two or more non-metallic
elements with one another?
(a) organic
(b) ionic
(c) covalent
(d) chemical - ANSWER-(c) covalent
Which of the following descriptions of Lewis dot structure is NOT correct?
(a) they show the bonding between atoms of a molecule
(b) they they show all the electrons of each atom of a molecule
(c) the total number of electrons is equal to the sum of the number of valance electrons
on each atom
(d) they show any lone pairs of electrons that may exist in a molecule that are not
bonded to another atom - ANSWER-(b) they they show all the electrons of each atom of
a molecule
Which of the following does NOT describe a carboxyl group correctly?
(a) a carbon atom attached to an oxygen atom by a double bond and to a hydroxyl
group by a single bond.
(b) a carbonyl group bonded to a hydroxyl group.
(c) a set of four atoms bonded together and abbreviated as C02H.
(d) a carbon atom attached to a hydrogen atom by a double bond and to an oxygen
atom by a double bond. - ANSWER-(d) a carbon atom attached to a hydrogen atom by
a double bond and to an oxygen atom by a double bond.
A gas is held in a closed container and held at constant temperature. What is the effect
of increasing the volume of the container by 3 times?
(a) the pressure is tripled
(b) the pressure increases to one third
(c) the pressure decreases to one third
(d) the pressure remains constant - ANSWER-(c) the pressure decreases to one third
Use the following information to answer question.
, Four identical liquid samples inside of identical sealed containers initially at room
temperature were placed in four isolated environments, each with its own maintained
temperature. After each liquid sample is allowed sufficient time to assume the
temperature of its environment, the samples changed as follows: In sample A, the liquid
vaporizes and is now a gas. In sample B, the liquid is boiling. In sample C, the liquid is
now a solid. In sample D, the liquid remains as a liquid.
Which sample's container has the greatest pressure?
(a) sample A
(b) sample B
(c) sample C
(d) sample D - ANSWER-(a) sample A
Use the following information to answer question.
Four identical liquid samples inside of identical sealed containers initially at room
temperature were placed in four isolated environments, each with its own maintained
temperature. After each liquid sample is allowed sufficient time to assume the
temperature of its environment, the samples changed as follows: In sample A, the liquid
vaporizes and is now a gas. In sample B, the liquid is boiling. In sample C, the liquid is
now a solid. In sample D, the liquid remains as a liquid.
If the temperature in each environment were increased by 10 degrees Celsius and each
sample were allowed time to assume the new temperature, which of the following
events is MOST likely to occur?
(a) sample A would become a liquid
(b) sample B would become a gas
(c) sample D would begin to boil
(d) None of these are likely to occur - ANSWER-(b) sample B would become a gas
Which statement best describes the molecular arrangement of a liquid crystal?
(a) the molecular arrangement is random in some directions and regular in others.
(b) the molecular arrangement is a regularly, repeating pattern in all directions.
(c) the molecular arrangement is random in all directions.
(d) the molecular arrangement is reduced to one layer with a random pattern. -
ANSWER-(a) the molecular arrangement is random in some directions and regular in
others.
Which of the following is not true of a chemical reaction?
(a) matter is never gained or lost
(b) heat may be absorbed or released
(c) the rate of the reaction increases with temperature
