BTEC Unit 5 - Chemistry Exam Questions
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Terms in this set (67)
The enthalpy change that occurs when one
Enthalpy of
mole of a substance is burnt completely in
combustion (∆Hc)
oxygen under standard conditions
The enthalpy change that occurs when one
Enthalpy of mole of a substance is formed from its
Formation (∆Hf) elements in their standard states under
standard conditions
The thermal energy stored in a chemical
system. It is defined by:
Enthalpy Enthalpy = Internal energy of the system +
(pressure x volume)
H = U + pV
The enthalpy change is independent of the
What is Hess' Law?
route taken
The enthalpy change that occurs when one
Enthalpy of hydration mole of gaseous ions is dissolved in water to
(ΔHhyd) make an infinitely dilute solution under
standard conditions
, What factors affect Size of the ion
the enthalpy of Charge of the ion
hydration?
Define the term, Can act as an acid and a base
amphoteric
a compound that contains one or more
Acid hydrogen atoms and produces hydrogen
ions when dissolved in water
A compound that reacts to form a salt and
Base
water
A base that dissolves in water forming OH-
Alkali
ions
Aluminium oxide Aluminium chloride and water
reacts with hot
hydrochloric acid to
produce...
Aluminium oxide Aluminates
reacts with bases
such as sodium
hydroxide to form...
Why is the oxide ion Because it has a very small size and a high
strongly basic? (2-) charge
What forms when Calcium hydroxide (lime) which can be used
calcium oxide by farmers to raise the pH of acidic soil
(quicklime) reacts
with water?
What can magnesium A desiccant. This is useful when preserving
oxide be used as? books in a library.
With 100% Correct Answers
Save
Terms in this set (67)
The enthalpy change that occurs when one
Enthalpy of
mole of a substance is burnt completely in
combustion (∆Hc)
oxygen under standard conditions
The enthalpy change that occurs when one
Enthalpy of mole of a substance is formed from its
Formation (∆Hf) elements in their standard states under
standard conditions
The thermal energy stored in a chemical
system. It is defined by:
Enthalpy Enthalpy = Internal energy of the system +
(pressure x volume)
H = U + pV
The enthalpy change is independent of the
What is Hess' Law?
route taken
The enthalpy change that occurs when one
Enthalpy of hydration mole of gaseous ions is dissolved in water to
(ΔHhyd) make an infinitely dilute solution under
standard conditions
, What factors affect Size of the ion
the enthalpy of Charge of the ion
hydration?
Define the term, Can act as an acid and a base
amphoteric
a compound that contains one or more
Acid hydrogen atoms and produces hydrogen
ions when dissolved in water
A compound that reacts to form a salt and
Base
water
A base that dissolves in water forming OH-
Alkali
ions
Aluminium oxide Aluminium chloride and water
reacts with hot
hydrochloric acid to
produce...
Aluminium oxide Aluminates
reacts with bases
such as sodium
hydroxide to form...
Why is the oxide ion Because it has a very small size and a high
strongly basic? (2-) charge
What forms when Calcium hydroxide (lime) which can be used
calcium oxide by farmers to raise the pH of acidic soil
(quicklime) reacts
with water?
What can magnesium A desiccant. This is useful when preserving
oxide be used as? books in a library.
