DF3 + DF4

Question 1

Methane

Answer 1

CH4

Question 2

Ethane

Answer 2

C2H6

Question 3

Propane

Answer 3

C3H8

Question 4

Butane

Answer 4

C4H10

Question 5

Saturated

Answer 5

contains the maximum number of hydrogen atoms possible (no carbon-carbon double/triple bonds)

Question 6

Aliphatic

Answer 6

hydrocarbon compounds that do not contain any benzene rings

Question 7

Aromatic

Answer 7

hydrocarbon compound that contains one or more benzene ring

Question 8

Functional group

Answer 8

modifiers that are responsible for the characteristic chemical reactions of molecules

Question 9

Carbon’s ability to form complex compounds

Answer 9

carbon forms covalent bonds rather than ionic bonds and can form covalent bonds with itself (catenation), each carbon atom can form 4 covalent bonds so chains can be straight or branched and with other atoms or groups bonded to them

Question 10

Empirical formula

Answer 10

simplest ratio of elements in a compound

Question 11

CH3 branch

Answer 11

methyl

Question 12

CH3CH2 branch

Answer 12

ethyl

Question 13

CH3CH2CH2 branch

Answer 13

propyl

Question 14

bond enthalpy

Answer 14

energy required to break a particular bond

Question 15

breaking bonds is… (endo/exo)

Answer 15

endothermic (requires energy)

Question 16

making new bonds is… (endo/exo)

Answer 16

exothermic (energy released)

Question 17

equilibrium bond length

Answer 17

bond length when the atoms stop moving altogether and are NOT repelling each other

Question 18

effect of bond length on bond enthalpy

Answer 18

short bond length = high bond enthalpy

more attraction between electrons and nuclei

Question 19

why calculated bond enthalpies differ from published values

Answer 19

published value is an average of values of that bond in several compounds
experimental values may not have been carried out under standard conditions