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Definitions

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Total cards: 24•Content version: v4•Public deck•Updated: 8/1/2026

Card preview (24)

#1
Front (Question)

Define relative atomic mass

Back (Answer)

the weighted mean mass of an atom of an element relative to 1/12 of the mass of an atom of 12C

#2
Front (Question)

Define relative isotopic mass

Back (Answer)

the mass of an atom of an isotope compared to 1/12 the mass of an atom of 12C

#3
Front (Question)

Define 1st ionisation energy

Back (Answer)

the energy required to remove 1 electron from each atom in 1 mole of a gaseous element to form 1 mole of gaseous 1+ ions

#4
Front (Question)

Define nuclear attraction

Back (Answer)

the attractive force that the outer shell of electrons experiences from the nucleus

#5
Front (Question)

Define shielding

Back (Answer)

the repulsion between electrons in inner shells

#6
Front (Question)

Define an orbital

Back (Answer)

a region within an atom that can hold up to 2 electrons with opposite spin

#7
Front (Question)

Define a subshell

Back (Answer)

a group of the same type of atomic orbitals within a shell

#8
Front (Question)

Define electronegativity

Back (Answer)

the ability of an atom to attract the bonding pair of electrons in a covalent bond

#9
Front (Question)

Define a hydrogen bond

Back (Answer)

the attraction between the d+ H atom on 1 molecule and the lone pair of electrons on the d- Fluorine, Nitrogen or Oxygen on a different molecule

#10
Front (Question)

What is the equation for finding the number of particles in a substance?

Back (Answer)

number of particles = ( mass (g) / molar mass (g/mol) ) x 6.02x10^23 (number of particles = moles x 6.02x10^23)

#11
Front (Question)

What is the equation for atom economy?

Back (Answer)

atom economy = ( sum of molar masses of desired products / sum of molar masses of all products ) x 100

#12
Front (Question)

What is the equation for percentage yield?

Back (Answer)

percentage yield = (actual yield / theoretical yield ) x100

#13
Front (Question)

What is the ideal gas equation? What are the units?

Back (Answer)

pV = nRT pressure(Pa) x volume(m^3) = number of moles x gas constant x temperature(K)

#14
Front (Question)

What is the gas constant?

Back (Answer)

8.314 J/mol/K

#15
Front (Question)

How do you convert celsius to kelvin?

Back (Answer)

add 273 degrees

#16
Front (Question)

What is Avagadro’s constant?

Back (Answer)

6.02 x10^23

#17
Front (Question)

Define molecular formula

Back (Answer)

the exact number of atoms of each element present in a molecule

#18
Front (Question)

Define empirical formula

Back (Answer)

the simplest whole number ratio of atoms in a molecule

#19
Front (Question)

Define homologous series

Back (Answer)

a series of compounds with the same functional group, with each successive member differing by a CH2 group, and having the same general formula

#20
Front (Question)

Define homolytic fission

Back (Answer)

when a covalent bond breaks and one electron from the bonding pair is given to each atom previously involved in the bond to create 2 free radicals

#21
Front (Question)

Define a radical

Back (Answer)

an atom with a single unpaired electron that is very reactive

#22
Front (Question)

Define heterolytic fission

Back (Answer)

when a covalent bond breaks and one atom takes both of the bonding pair of electrons to become a negative ion, leaving the other atom as a positive ion

#23
Front (Question)

Define a sigma bond

Back (Answer)

the overlapping of 2 orbitals directly in the plane of the 2 atoms

#24
Front (Question)

Define hydrolysis

Back (Answer)

using water to break chemical bonds opposite of condensation