AS LEVEL AQA CHEMISTRY LATEST EXAM
(2025)QUESTIONS AND ANSWERS AREADY
GRADED A+.
What is an equation for number of particles involving number of moles and
Avogadros constant? - CorreCt Answers -number of particles = number of
moles x Avogadros constant
What is the Ideal Gas Equation? - CorreCt Answers -PV = nRT
What is P in regards to the Ideal Gas Equation and what is its units? -
CorreCt Answers -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? -
CorreCt Answers -V = nRT / P
volume and is measured in m^3
What is n in regards to the Ideal Gas Equation? - CorreCt Answers -n = PV
/ RT
number of moles
What is R in regards to the Ideal Gas Equation? - CorreCt Answers -R =
8.31K^-1mol^-1
gas constant
,What is T in regards to the Ideal Gas Equation? - CorreCt Answers -T =
temperature and is measured in K or kelvin ( 273 + Celsius)
How do you work out empirical formula? - CorreCt Answers -1.mass / Mr
2.divide by the smallest number
3.ratio
How do you work out molecular formula? - CorreCt Answers -1.find total
mass
2.mass / Mr
3.multiply answer by empirical formula
What is the equation for percentage atom economy? - CorreCt Answers -
atom economy % = mass of desired product / total mass of reactants x 100
Why are high atom economy processes better? - CorreCt Answers -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? - CorreCt Answers -x1000
How do you convert dm^3 into cm^3? - CorreCt Answers -x1000
How do you convert cm^3 into dm^3? - CorreCt Answers -/1000
How do you convert dm^3 into m^3? - CorreCt Answers -/1000
, What is ionic bonding? - CorreCt Answers -The electrostatic attraction
between oppositely charged ions in a lattice.
When are ions formed? - CorreCt Answers -When one or more electrons are
transferred from one atom to another.
What is the charge on a sulfate ion (SO4)? - CorreCt Answers -2-
What is the charge on a hydroxide ion (OH)? - CorreCt Answers --
What is the charge on a nitrate ion (NO3)? - CorreCt Answers --
What is the charge on a carbonate ion (CO3)? - CorreCt Answers -2-
What is the charge on an ammonium ion (NH4)? - CorreCt Answers -+
What are ionic compounds made up of? - CorreCt Answers -A positively
charged and negatively charged part.
What is the overall charge of a compound? - CorreCt Answers -0 (neutral)
What is covalent bonding? - CorreCt Answers -A shared pair of electrons
where molecules are held together by strong covalent bonds.
(2025)QUESTIONS AND ANSWERS AREADY
GRADED A+.
What is an equation for number of particles involving number of moles and
Avogadros constant? - CorreCt Answers -number of particles = number of
moles x Avogadros constant
What is the Ideal Gas Equation? - CorreCt Answers -PV = nRT
What is P in regards to the Ideal Gas Equation and what is its units? -
CorreCt Answers -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? -
CorreCt Answers -V = nRT / P
volume and is measured in m^3
What is n in regards to the Ideal Gas Equation? - CorreCt Answers -n = PV
/ RT
number of moles
What is R in regards to the Ideal Gas Equation? - CorreCt Answers -R =
8.31K^-1mol^-1
gas constant
,What is T in regards to the Ideal Gas Equation? - CorreCt Answers -T =
temperature and is measured in K or kelvin ( 273 + Celsius)
How do you work out empirical formula? - CorreCt Answers -1.mass / Mr
2.divide by the smallest number
3.ratio
How do you work out molecular formula? - CorreCt Answers -1.find total
mass
2.mass / Mr
3.multiply answer by empirical formula
What is the equation for percentage atom economy? - CorreCt Answers -
atom economy % = mass of desired product / total mass of reactants x 100
Why are high atom economy processes better? - CorreCt Answers -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? - CorreCt Answers -x1000
How do you convert dm^3 into cm^3? - CorreCt Answers -x1000
How do you convert cm^3 into dm^3? - CorreCt Answers -/1000
How do you convert dm^3 into m^3? - CorreCt Answers -/1000
, What is ionic bonding? - CorreCt Answers -The electrostatic attraction
between oppositely charged ions in a lattice.
When are ions formed? - CorreCt Answers -When one or more electrons are
transferred from one atom to another.
What is the charge on a sulfate ion (SO4)? - CorreCt Answers -2-
What is the charge on a hydroxide ion (OH)? - CorreCt Answers --
What is the charge on a nitrate ion (NO3)? - CorreCt Answers --
What is the charge on a carbonate ion (CO3)? - CorreCt Answers -2-
What is the charge on an ammonium ion (NH4)? - CorreCt Answers -+
What are ionic compounds made up of? - CorreCt Answers -A positively
charged and negatively charged part.
What is the overall charge of a compound? - CorreCt Answers -0 (neutral)
What is covalent bonding? - CorreCt Answers -A shared pair of electrons
where molecules are held together by strong covalent bonds.
