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Key Words

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Total cards: 22•Content version: v4•Public deck•Updated: 8/1/2026

Card preview (22)

#1
Front (Question)

Activation Energy

Back (Answer)

Minimum energy (1) required before a reaction can occur or go or start (1)

#2
Front (Question)

Atomic number

Back (Answer)

Number of protons in one atom or nucleus (1)

#3
Front (Question)

Catalyst

Back (Answer)

A substance that speeds up the reaction / alters the rate but is chemically unchanged at the end / not used up

#4
Front (Question)

Dynamic equilibrium

Back (Answer)

Rate of forward reaction = rate backward reaction (1) concentration remains constant (1)

#5
Front (Question)

Electronegativity

Back (Answer)

Tendency or strength or ability or power of an atom/element/nucleus to attract/withdraw electrons / e– density / bonding pair / shared pair 1 In a covalent bond (tied to M1 – unless silly slip in M1)

#6
Front (Question)

Empirical formula

Back (Answer)

Tendency or strength or ability or power of an atom/element/nucleus to attract/withdraw electrons / e– density / bonding pair / shared pair 1 In a covalent bond (tied to M1 – unless silly slip in M1)

#7
Front (Question)

Enthalpy change

Back (Answer)

Heat energy change (1) Not energy on its own measured at constant pressure (1)

#8
Front (Question)

First ionisation energy

Back (Answer)

Energy required to remove one mol of electrons from one mole of gaseous atoms to form one mole of + 1 ions also in their gaseous state

#9
Front (Question)

Hess’s law

Back (Answer)

Enthalpy change is independent of route taken

#10
Front (Question)

Isotope

Back (Answer)

Atoms with the same number of protons / proton number (1) NOT same atomic number with different numbers of neutrons (1)

#11
Front (Question)

Le Chatelier’s Principle

Back (Answer)

Equilibrium opposes a change;

#12
Front (Question)

Mean Bond Enthalpy

Back (Answer)

Energy required) to break a given covalent bond (1) averaged over a range of compounds (1)

#13
Front (Question)

Oxidation

Back (Answer)

Loss of electrons

#14
Front (Question)

Oxidising agent

Back (Answer)

Species that Gains electrons (or removes electrons) 1

#15
Front (Question)

Periodicity

Back (Answer)

Pattern in the change in the properties of a row of elements (1) Repeated in the next row (1)

#16
Front (Question)

Rate of reaction

Back (Answer)

(Measured) change in concentration (of a substance) in unit time / given time

#17
Front (Question)

Reducing agent

Back (Answer)

A reducing agent loses (donates) electrons (1)

#18
Front (Question)

Reduction

Back (Answer)

Reduction involves gain of electrons

#19
Front (Question)

Real active atomic mass

Back (Answer)

Average/mean mass of (1) atom(s) (of an element) 1 1/12 mass of one atom of 12C 1

#20
Front (Question)

Real active molecular mas

Back (Answer)

Mean /average mass of a molecule/entity/formula 1 1/12th mass of atom of 12C

#21
Front (Question)

Standard Enthalpy of Combustion

Back (Answer)

Enthalpy change when 1 mol of a substance (or compound) (QL mark) 1 is (completely) burned in oxygen (or reacted in excess oxygen) 1 at 298 K and 100 kPa (or under standard conditions) 1

#22
Front (Question)

Standard enthalpy change of formation

Back (Answer)

Enthalpy change) when 1 mol (1) of a compound is formed from its constituent elements (1) in their standard states (1)