Questions and answers for the Graduate Level
Exam in Chemistry, with detailed explanations
1. Beryllium Sulfate is less soluble in water due to
(1) high flammable energy,
(2) low dissociation energy,
(3) low flammable energy, and
(4) lonic band.
Definition;
BeSO4 (beryllium sulfate) is a white crystalline substance.
Jons Jakob Berzelius discovered it for the first time in 1815.
Beryllium sulfate can be made by treating an aqueous solution of any
beryllium salt with sulfuric acid, followed by evaporation and
crystallization of the solution. Heat the hydrated product to 400°C to
convert it to anhydrous salt. Because of its high flammable energy,
beryllium sulfate is less soluble in water.
2. What is the name of the system that employs radiation to determine
the age of prehistoric materials?
(1) Dating with radium
(2) Uranium based dating
(3) The carbon dating method
(4) Deuterium dating
Definition;
Radiocarbon dating (also known as carbon dating) is a radiometric
dating method that employs the naturally occurring radioisotope
carbon-14 ( 14C) to estimate the age of carbon-bearing materials up to
approximately 58,000 to 62,000 years.
, 3. Cement is hardened by
(1) dehydration
(2) hydration and water dissociation
(3) water dissociation
(4) polymerisation
Definition;
( Cements (for example, Portland cement) harden owing to hydration,
which happens regardless of the amount of water in the mixture; they
can harden even when submerged or regularly exposed to damp
conditions. When anhydrous cement powder is mixed with water, a
chemical process takes place that results in the formation of hydrates
that are not water soluble.
4. What occurs when a chemical bond forms?
(1) energy is always absorbed;
(2) energy is always released;
(3) more energy is released than absorbed; and (4) energy is neither
released nor absorbed.
Definition;
Energy is released when a link is broken, and energy must be received
when a bond is formed.
As these occur, a shift in the system's chemical energy happens. Each
molecule's bond contains a quantity of energy that has been scientifically
calculated and is released into the chemical system when the link is
broken. The energy contained inside these bonds is stored,' and can be
thought of as potential energy. When these bonds are broken, energy is
released, resulting in useful energy.
5, Which of the following is NOT a carbohydrate?
(1) Nylon;
(2) Cane-sugar;
(3) Turpentine; and
(4) Hydrogen peroxide.
Exam in Chemistry, with detailed explanations
1. Beryllium Sulfate is less soluble in water due to
(1) high flammable energy,
(2) low dissociation energy,
(3) low flammable energy, and
(4) lonic band.
Definition;
BeSO4 (beryllium sulfate) is a white crystalline substance.
Jons Jakob Berzelius discovered it for the first time in 1815.
Beryllium sulfate can be made by treating an aqueous solution of any
beryllium salt with sulfuric acid, followed by evaporation and
crystallization of the solution. Heat the hydrated product to 400°C to
convert it to anhydrous salt. Because of its high flammable energy,
beryllium sulfate is less soluble in water.
2. What is the name of the system that employs radiation to determine
the age of prehistoric materials?
(1) Dating with radium
(2) Uranium based dating
(3) The carbon dating method
(4) Deuterium dating
Definition;
Radiocarbon dating (also known as carbon dating) is a radiometric
dating method that employs the naturally occurring radioisotope
carbon-14 ( 14C) to estimate the age of carbon-bearing materials up to
approximately 58,000 to 62,000 years.
, 3. Cement is hardened by
(1) dehydration
(2) hydration and water dissociation
(3) water dissociation
(4) polymerisation
Definition;
( Cements (for example, Portland cement) harden owing to hydration,
which happens regardless of the amount of water in the mixture; they
can harden even when submerged or regularly exposed to damp
conditions. When anhydrous cement powder is mixed with water, a
chemical process takes place that results in the formation of hydrates
that are not water soluble.
4. What occurs when a chemical bond forms?
(1) energy is always absorbed;
(2) energy is always released;
(3) more energy is released than absorbed; and (4) energy is neither
released nor absorbed.
Definition;
Energy is released when a link is broken, and energy must be received
when a bond is formed.
As these occur, a shift in the system's chemical energy happens. Each
molecule's bond contains a quantity of energy that has been scientifically
calculated and is released into the chemical system when the link is
broken. The energy contained inside these bonds is stored,' and can be
thought of as potential energy. When these bonds are broken, energy is
released, resulting in useful energy.
5, Which of the following is NOT a carbohydrate?
(1) Nylon;
(2) Cane-sugar;
(3) Turpentine; and
(4) Hydrogen peroxide.
