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5.2 - Energetics

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

Card preview (22)

#1
Front (Question)

Exothermic reaction

Back (Answer)

Transfers energy to surrounds so temp of surroundings increases E.g. combustion/neutralisation E.g. handwarmers

#2
Front (Question)

Endothermic reactions

Back (Answer)

Takes in energy from surrounds so temp of surrounds decreases E.g. thermal decomposition

#3
Front (Question)

Exothermic or endothermic: salt dissolving in water

Back (Answer)

Endothermic

#4
Front (Question)

Exothermic or endothermic: neutralisation

Back (Answer)

Exothermic

#5
Front (Question)

Exothermic or endothermic: displacement

Back (Answer)

Exothermic

#6
Front (Question)

Exothermic or endothermic: combustion

Back (Answer)

Exothermic

#7
Front (Question)

Heat energy change equation or enthalpy change

Back (Answer)

Q=mc🔼T Heat energy change = mass of water x SHC x change in temp of water

#8
Front (Question)

How to convert J to kJ

Back (Answer)

divide by 1000

#9
Front (Question)

Moles

Back (Answer)

Mass/RFM

#10
Front (Question)

Q/kJ divided by mol =

Back (Answer)

Enthalpy change or kJ/mol

#11
Front (Question)

Exothermic reaction energy level diagram

Back (Answer)

Reactants have more energy -> goes down

#12
Front (Question)

Endothermic reaction energy level diagram

Back (Answer)

Reactants have less energy than products -> goes up

#13
Front (Question)

Energy needed to BREAK > energy released

Back (Answer)

Endothermic

#14
Front (Question)

Energy need to BREAK < energy released

Back (Answer)

Exothermic

#15
Front (Question)

What reversible reactions occurs in a closed system/sealed container

Back (Answer)

Equilibrium in reacts - reactions occurs at exactly same rate in each directions

#16
Front (Question)

Endothermic or exothermic: activating an ice pack

Back (Answer)

Endothermic

#17
Front (Question)

Endothermic or exothermic: thermal decomposition of CaCO3

Back (Answer)

Endothermic

#18
Front (Question)

Bond energy calculations

Back (Answer)

Enthalpy change = bond breaking - bond making = kJ/mol

#19
Front (Question)

Calculating enthalpy changes experimentally

Back (Answer)

• use chemical reaction to heat known mass of water • measure temp of water before and after • Q=mcAT AH = -Q/mol

#20
Front (Question)

Errors of practical

Back (Answer)

• lots of heat lost to surroundings • incomplete combustion (yellow flame/soot) produces less energy

#21
Front (Question)

What is SHC

Back (Answer)

4.2

#22
Front (Question)

Neutralisation

Back (Answer)

Acid reacts with alkali Acid + base —> salt + H20