# Naming Hydrocarbons

Views:

Category: Education

## Presentation Description

No description available.

## Presentation Transcript

### Naming Hydrocarbons :

Naming Hydrocarbons Carbon to hydrogen ratios

### Vocabulary :

Alkane- A hydrocarbon that is saturated. Saturated- when a hydrocarbon contains the maximum number of hydrogens. Vocabulary

### Pattern recognition (easy) :

Look at the numbers below. Find the pattern in your group. Predict the final number. 2 4 6 8 ?? Pattern recognition (easy)

### Pattern recognition (medium) :

Look at the numbers below. Find the pattern in your group. Predict the final number. 1 4 9 16 25 ?? Pattern recognition (medium)

### Pattern recognition (tricky) :

Look at the numbers below. Find the pattern in your group. Predict the final number. x+10y 2x+8y 3x+6y 4x+4y ?? Pattern recognition (tricky)

### Do you notice a pattern? :

CH C2H4 C3H9 C4H16 C5H25 C6H36 C7H49 C8H64 C10H? Do you notice a pattern? Can you come up with a math mathematical equation that relates the number of carbons to the number of hydrogens? CxH? What is the relationship between carbon and hydrogen?

### Do you notice a pattern? :

CH4 C2H6 C3H8 C4H10 C5H12 C6H14 C7H16 C8H18 C10H? Do you notice a pattern? Can you come up with a mathematical relationship between the number of carbons and the number of hydrogens?

### Alkanes :

In an alkane the number of hydrogens is twice that of the carbons plus two. Recall CH4 C2H6 C3H8 C4H10 Note: if you double the number of carbons and then add two you get the number of hydrogens. Alkanes

### Naming alkanes :

Since the number of hydrogens depends on the number of carbons, alkanes are named by the number of carbons present. See right. Just like with binary molecular, a prefix system is used. Naming alkanes

### Naming alkanes :

When ever you wish to name an alkane (or any hydrocarbon for that matter) you must first look at the number of carbons present. The number of carbons present ALWAYS tells you what prefix to use Examples CH4 is METHane C5H12 is PENTane C7H16 is HEPTane Naming alkanes

### So which is which??? :

For the rest of class today we will look at the three major classes of compounds that we have studied in this unit. I will flash a compound on the screen and you will identify it COPY DOWN THE INFORMATION BELOW 1= Ionic 2= Binary 3= Hydrocarbon Compound Molecular So which is which???