C7.2 Organic molecules and functional groups

Question 1

1. What are alkanes?

Answer 1

-a family of hydrocarbons

Question 2

1. What are alkanes made up of?

Answer 2

• carbon atoms surrounded by hydrogen atoms

- single covalent bonds (saturated)

Question 3

1. What type of molecules does the alkane family have?

Answer 3

-similar but different chain length of carbon atoms

Question 4

1. What is the formula for all alkanes?

Answer 4

-CnH2n+2

n= number of carbon atoms

Question 5

2. What are the names of alkanes?

Answer 5

-methane, ethane, propane, butane

Question 6

2. What is the molecular formula of METHANE?

Answer 6

CH4

Question 7

2. What is the molecular formula of ETHANE?

Answer 7

C2H6

Question 8

2. What is the molecular formula of PROPANE?

Answer 8

C3H8

Question 9

2. What is the molecular formula of BUTANE?

Answer 9

C4H10

Question 10

4. How do alkanes burn?

Answer 10

-alkanes burn in plenty of air to give carbon dioxide and water

Question 11

4. What is the word equation for alkanes burning?

Answer 11

Alkane + oxygen → carbon dioxide + water

Question 12

4. What is the symbol equation for alkanes burning (e.g. methane)?

Answer 12

CH4(g) + 2O2(g) → 2H2O(l) + CO2(g)

Question 13

5. How reactive are alkanes? Why?

Answer 13

-alkanes are unreactive towards aqueous reagents because they contain only C—C and C—H bonds, which are difficult to break and therefore unreactive

Question 14

6. What are saturated compounds?

Answer 14

-in saturated compounds, such as alkanes, all the carbon to carbon bonds are single, C—C,

Question 15

6. What are unsaturated compounds?

Answer 15

-in unsaturated compounds there are carbon to carbon double bonds, C=C