Chemistry A Level Definitions (Edexcel)
questions and answers
Mass number - correct answersTotal number of protons and neutrons in the
nucleus
Atomic number - correct answersNumber of protons in the nucleus
Isotope - correct answersAtoms which have the same number of protons but
different number of neutrons
Relative Atomic Mass (Ar) - correct answersThe weighted mean mass of an atom
of an element compared to 1/12th of the mass of an atom of carbon-12
Relative isotopic mass - correct answersThe mass of an atom of an isotope
compared with 1/12th of the mass of an atom of carbon-12
Relative molecular mass - correct answersThe average mass of a molecule
compared to 1/12th of the mass of an atom of carbon-12
Shape of s-orbitals - correct answersspherical
,Chemistry A Level Definitions (Edexcel)
questions and answers
Shape of p-orbitals - correct answers3 dumbbells
Electromagnetic radiation - correct answersEnergy that is transmitted as waves
with a spectrum of different frequencies
First ionisation energy - correct answersThe energy required to remove 1 electron
from each atom in 1 mole of gaseous atoms to form 1 mole of gaseous 1+ ions
Second ionisation energy - correct answersThe energy required to remove 1
electron form each ion in 1 mole of gaseous 1+ ions to form 1 mole of gaseous 2+
ions
Equation for nth ionisation energy - correct answersX(n-1)+ ---> Xn+ + e-
Dmitri Mendeleev - correct answersThe person who put the elements in a
meaningful order in 1869
Element - correct answersA group of atoms which all have the same number of
protons
, Chemistry A Level Definitions (Edexcel)
questions and answers
Ion - correct answersAn atom which has different numbers of protons and
electrons and hence has a positive or negative charge
Orbital - correct answersA region within an atom that can hold up to 2 electrons
with opposite spins
Relative Formula Mass - correct answersThe mass of a formula unit of a giant
structure relative to 1/12th of the mass of an atom of carbon-12
Molecular Formula - correct answersActual number of atoms of each element in
the molecule
Empirical Formula - correct answersSimplest whole number ratio of atoms of
each element in the compound
Disproportionation - correct answersOccurs when an element is simultaneously
oxidised and reduced to form two different products
Oxidising Agent - correct answersA compound which oxidises another compound
by gaining electrons and hence itself is reduced
questions and answers
Mass number - correct answersTotal number of protons and neutrons in the
nucleus
Atomic number - correct answersNumber of protons in the nucleus
Isotope - correct answersAtoms which have the same number of protons but
different number of neutrons
Relative Atomic Mass (Ar) - correct answersThe weighted mean mass of an atom
of an element compared to 1/12th of the mass of an atom of carbon-12
Relative isotopic mass - correct answersThe mass of an atom of an isotope
compared with 1/12th of the mass of an atom of carbon-12
Relative molecular mass - correct answersThe average mass of a molecule
compared to 1/12th of the mass of an atom of carbon-12
Shape of s-orbitals - correct answersspherical
,Chemistry A Level Definitions (Edexcel)
questions and answers
Shape of p-orbitals - correct answers3 dumbbells
Electromagnetic radiation - correct answersEnergy that is transmitted as waves
with a spectrum of different frequencies
First ionisation energy - correct answersThe energy required to remove 1 electron
from each atom in 1 mole of gaseous atoms to form 1 mole of gaseous 1+ ions
Second ionisation energy - correct answersThe energy required to remove 1
electron form each ion in 1 mole of gaseous 1+ ions to form 1 mole of gaseous 2+
ions
Equation for nth ionisation energy - correct answersX(n-1)+ ---> Xn+ + e-
Dmitri Mendeleev - correct answersThe person who put the elements in a
meaningful order in 1869
Element - correct answersA group of atoms which all have the same number of
protons
, Chemistry A Level Definitions (Edexcel)
questions and answers
Ion - correct answersAn atom which has different numbers of protons and
electrons and hence has a positive or negative charge
Orbital - correct answersA region within an atom that can hold up to 2 electrons
with opposite spins
Relative Formula Mass - correct answersThe mass of a formula unit of a giant
structure relative to 1/12th of the mass of an atom of carbon-12
Molecular Formula - correct answersActual number of atoms of each element in
the molecule
Empirical Formula - correct answersSimplest whole number ratio of atoms of
each element in the compound
Disproportionation - correct answersOccurs when an element is simultaneously
oxidised and reduced to form two different products
Oxidising Agent - correct answersA compound which oxidises another compound
by gaining electrons and hence itself is reduced
