AS-level AQA Chemistry Exam Study Questions
with Complete Solutions (Verified Correct
Answers)
Latest Update 2024
What is an equation for number of moles involving mass and Mr? - ANSWER number of moles =
mass / Mr
What is an equation for number of moles involving concentration and volume? - ANSWER
number of moles = concentration x volume
What is an equation for number of particles involving number of moles and Avogadros
constant? - ANSWER number of particles = number of moles x Avogadros constant
What is the Ideal Gas Equation? - ANSWER PV = nRT
What is P in regards to the Ideal Gas Equation and what is its units? - ANSWER P = nRT / V
pressure and is measured in Pa or Pascals
What is V in regards to the Ideal Gas Equation and what is its units? - ANSWER V = nRT / P
volume and is measured in m^3
What is n in regards to the Ideal Gas Equation? - ANSWER n = PV / RT
number of moles
What is R in regards to the Ideal Gas Equation? - ANSWER R = 8.31K^-1mol^-1
gas constant
,What is T in regards to the Ideal Gas Equation? - ANSWER T = temperature and is measured in K
or kelvin ( 273 + Celsius)
How do you work out empirical formula? - ANSWER 1.mass / Mr
2.divide by the smallest number
3.ratio
How do you work out molecular formula? - ANSWER 1.find total mass
2.mass / Mr
3.multiply answer by empirical formula
What is the equation for percentage atom economy? - ANSWER atom economy % = mass
of desired product / total mass of reactants x 100
Why are high atom economy processes better? - ANSWER They produce less waste and
make more efficient use of raw materials so are less expensive.
How do you convert m^3 into dm^3? - ANSWER x1000
How do you convert dm^3 into cm^3? - ANSWER x1000
How do you convert cm^3 into dm^3? - ANSWER /1000
How do you convert dm^3 into m^3? - ANSWER /1000
What is ionic bonding? - ANSWER The electrostatic attraction between oppositely charged ions
in a lattice.
, When are ions formed? - ANSWER When one or more electrons are transferred from one
atom to another.
What is the charge on a sulfate ion (SO4)? - ANSWER 2-
What is the charge on a hydroxide ion (OH)? - ANSWER -
What is the charge on a nitrate ion (NO3)? - ANSWER -
What is the charge on a carbonate ion (CO3)? - ANSWER 2-
What is the charge on an ammonium ion (NH4)? - ANSWER +
What are ionic compounds made up of? - ANSWER A positively charged and negatively charged
part.
What is the overall charge of a compound? - ANSWER 0 (neutral)
What is covalent bonding? - ANSWER A shared pair of electrons where molecules are
held together by strong covalent bonds.
What is metallic bonding? - ANSWER The attraction between delocalised electrons and positive
ions arranged in a lattice.
What is an ionic crystal structure? - ANSWER A lattice of positive ions each surrounded in a
regular arrangement by negative ions with strong ionic bonds between them so a lot of
energy is needed to break them.
with Complete Solutions (Verified Correct
Answers)
Latest Update 2024
What is an equation for number of moles involving mass and Mr? - ANSWER number of moles =
mass / Mr
What is an equation for number of moles involving concentration and volume? - ANSWER
number of moles = concentration x volume
What is an equation for number of particles involving number of moles and Avogadros
constant? - ANSWER number of particles = number of moles x Avogadros constant
What is the Ideal Gas Equation? - ANSWER PV = nRT
What is P in regards to the Ideal Gas Equation and what is its units? - ANSWER P = nRT / V
pressure and is measured in Pa or Pascals
What is V in regards to the Ideal Gas Equation and what is its units? - ANSWER V = nRT / P
volume and is measured in m^3
What is n in regards to the Ideal Gas Equation? - ANSWER n = PV / RT
number of moles
What is R in regards to the Ideal Gas Equation? - ANSWER R = 8.31K^-1mol^-1
gas constant
,What is T in regards to the Ideal Gas Equation? - ANSWER T = temperature and is measured in K
or kelvin ( 273 + Celsius)
How do you work out empirical formula? - ANSWER 1.mass / Mr
2.divide by the smallest number
3.ratio
How do you work out molecular formula? - ANSWER 1.find total mass
2.mass / Mr
3.multiply answer by empirical formula
What is the equation for percentage atom economy? - ANSWER atom economy % = mass
of desired product / total mass of reactants x 100
Why are high atom economy processes better? - ANSWER They produce less waste and
make more efficient use of raw materials so are less expensive.
How do you convert m^3 into dm^3? - ANSWER x1000
How do you convert dm^3 into cm^3? - ANSWER x1000
How do you convert cm^3 into dm^3? - ANSWER /1000
How do you convert dm^3 into m^3? - ANSWER /1000
What is ionic bonding? - ANSWER The electrostatic attraction between oppositely charged ions
in a lattice.
, When are ions formed? - ANSWER When one or more electrons are transferred from one
atom to another.
What is the charge on a sulfate ion (SO4)? - ANSWER 2-
What is the charge on a hydroxide ion (OH)? - ANSWER -
What is the charge on a nitrate ion (NO3)? - ANSWER -
What is the charge on a carbonate ion (CO3)? - ANSWER 2-
What is the charge on an ammonium ion (NH4)? - ANSWER +
What are ionic compounds made up of? - ANSWER A positively charged and negatively charged
part.
What is the overall charge of a compound? - ANSWER 0 (neutral)
What is covalent bonding? - ANSWER A shared pair of electrons where molecules are
held together by strong covalent bonds.
What is metallic bonding? - ANSWER The attraction between delocalised electrons and positive
ions arranged in a lattice.
What is an ionic crystal structure? - ANSWER A lattice of positive ions each surrounded in a
regular arrangement by negative ions with strong ionic bonds between them so a lot of
energy is needed to break them.
