Functional groups and homologous series

Question 1

a functional group is a molecule or group of atoms which

Answer 1

gives the compound some distinctive and predictable properties

Question 2

what does the COOH functional group give as a property?

Answer 2

a sour and acidic taste

Question 3

homologous series have similar chemical and physical properties that show a

Answer 3

gradation- gradual change from one to the next

Question 4

the organic compounds that are mainly used as fuels are

Answer 4

alkanes

Question 5

which organic compound is a common fuel?

Answer 5

alkanes

Question 6

alkanes do not contain

Answer 6

a functional group

Question 7

what makes alkanes a homologous series?

Answer 7

they differ by CH2 for each next member

Question 8

the five types of formula are

Answer 8

molecular, empirical, displayed, structural, skeletal

Question 9

what type of formula can we use for homologous series?

Answer 9

general formulae

Question 10

in general formulae, n represents

Answer 10

the number of carbon atoms, but excluding any in the functional group

Question 11

what is the general formula for carboxylic acids?

Answer 11

Cn H2n+1 COOH

Question 12

the general formula for alkanes is

Answer 12

CnH2n+2

Question 13

the general formula for alkenes is

Answer 13

CnH2n

Question 14

the general formula for halogenoalkanes is

Answer 14

CnH2n+1 X

Question 15

the general formula for alcohols is

Answer 15

CnH2n+1 OH

Question 16

all alkanes form………as products when burned in air

Answer 16

carbon dioxide and water

Question 17

the commonest alkanes is

Answer 17

methane

Question 18

the equation for the complete combustion of methane is

Answer 18

CH4 + 2O2 = CO2 + 2H2O

Question 19

the boiling point of alcohols ……….. as you go down the homologous series?

Answer 19

increases

Question 20

the boiling point of alcohols increases as gradation because

Answer 20

the carbon chain length increases, so more energy is required to break all the carbon-carbon bonds in the chain

Question 21

in molecular models, what colour are carbon, hydrogen and oxygen?

Answer 21

carbon is black, hydrogen is white and oxygen is red