3.1.4 ENERGETICS, A LEVEL CHEMISTRY, AQA
QUESTIONS WITH ANSWERS.
What,is,enthalpy,change?,,,ANS,-Heat,energy,transferred,in,a,reaction,at,constant,pressure
What,are,standard,conditions,for,enthalpy,change?,,,ANS,-
100kPa,and,stated,temperature,(normally,25,degrees,celcius)
What,values,of,deltaH,do,exothermic,reactions,have?,,,ANS,-Negative,(less,than,0)
What,values,of,deltaH,do,endothermic,reactions,have?,,,ANS,-Positive,(more,than,0)
What,do,exothermic,reactions,do,with,energy?,,,ANS,-Give,out,energy
What,do,endothermic,reactions,do,with,energy?,,,ANS,-Absorb,energy
Are,oxidation,reactions,endo,or,exothermic?,,,ANS,-Exothermic
Is,combustion,endo,or,exothermic?,,,ANS,-Exothermic
Are,thermal,decomposition,reactions,endo,or,exothermic?,,,ANS,-Endothermic
Is,photosynthesis,endo,or,exothermic?,,,ANS,-Endothermic
What,happens,to,reactant,bonds?,,,ANS,-They,are,broken
What,happens,to,product,bonds?,,,ANS,-They,are,formed
Which,bonds,are,broken:,reactant,or,product,bonds?,,,ANS,-Reactant
, Which,bonds,are,formed:,reactant,or,product,bonds?,,,ANS,-Product
Is,energy,taken,in,or,released,when,you,break,bonds?,,,ANS,-Taken,in
Is,bond,breaking,endo,or,exothermic?,,,ANS,-Endothermic
What,values,of,deltaH,does,bond,breaking,have?,,,ANS,-Positive,(more,than,0)
How,does,bond,breaking,energy,change,as,the,bond,strength,increases?,,,ANS,-
It,takes,more,energy,to,break
Is,energy,taken,in,or,released,when,you,make,bonds?,,,ANS,-Released
Is,bond,making,endo,or,exothermic?,,,ANS,-Exothermic
What,values,of,deltaH,does,bond,making,have?,,,ANS,-Negative,(less,than,0)
How,does,bond,making,energy,change,as,the,bond,strength,increases?,,,ANS,-
They,release,more,energy,when,formed
If,you,need,more,energy,to,break,bonds,than,is,released,when,bonds,are,made,,what,values,of,deltaH,do,
you,get?,,,ANS,-Positive,(more,than,0)
If,you,need,less,energy,to,break,bonds,than,is,released,when,bonds,are,made,,what,values,of,deltaH,do,yo
u,get?,,,ANS,-Negative,(less,than,0)
What,is,bond,enthalpy?,,,ANS,-The,energy,required,to,break,bonds
QUESTIONS WITH ANSWERS.
What,is,enthalpy,change?,,,ANS,-Heat,energy,transferred,in,a,reaction,at,constant,pressure
What,are,standard,conditions,for,enthalpy,change?,,,ANS,-
100kPa,and,stated,temperature,(normally,25,degrees,celcius)
What,values,of,deltaH,do,exothermic,reactions,have?,,,ANS,-Negative,(less,than,0)
What,values,of,deltaH,do,endothermic,reactions,have?,,,ANS,-Positive,(more,than,0)
What,do,exothermic,reactions,do,with,energy?,,,ANS,-Give,out,energy
What,do,endothermic,reactions,do,with,energy?,,,ANS,-Absorb,energy
Are,oxidation,reactions,endo,or,exothermic?,,,ANS,-Exothermic
Is,combustion,endo,or,exothermic?,,,ANS,-Exothermic
Are,thermal,decomposition,reactions,endo,or,exothermic?,,,ANS,-Endothermic
Is,photosynthesis,endo,or,exothermic?,,,ANS,-Endothermic
What,happens,to,reactant,bonds?,,,ANS,-They,are,broken
What,happens,to,product,bonds?,,,ANS,-They,are,formed
Which,bonds,are,broken:,reactant,or,product,bonds?,,,ANS,-Reactant
, Which,bonds,are,formed:,reactant,or,product,bonds?,,,ANS,-Product
Is,energy,taken,in,or,released,when,you,break,bonds?,,,ANS,-Taken,in
Is,bond,breaking,endo,or,exothermic?,,,ANS,-Endothermic
What,values,of,deltaH,does,bond,breaking,have?,,,ANS,-Positive,(more,than,0)
How,does,bond,breaking,energy,change,as,the,bond,strength,increases?,,,ANS,-
It,takes,more,energy,to,break
Is,energy,taken,in,or,released,when,you,make,bonds?,,,ANS,-Released
Is,bond,making,endo,or,exothermic?,,,ANS,-Exothermic
What,values,of,deltaH,does,bond,making,have?,,,ANS,-Negative,(less,than,0)
How,does,bond,making,energy,change,as,the,bond,strength,increases?,,,ANS,-
They,release,more,energy,when,formed
If,you,need,more,energy,to,break,bonds,than,is,released,when,bonds,are,made,,what,values,of,deltaH,do,
you,get?,,,ANS,-Positive,(more,than,0)
If,you,need,less,energy,to,break,bonds,than,is,released,when,bonds,are,made,,what,values,of,deltaH,do,yo
u,get?,,,ANS,-Negative,(less,than,0)
What,is,bond,enthalpy?,,,ANS,-The,energy,required,to,break,bonds
