Here's how the formula of an alkene changes when you add an extra carbon atom:

Understanding the Basics

* Alkenes: These are hydrocarbons with a double bond between two carbon atoms. The general formula for an alkene is C_nH_2n, where 'n' represents the number of carbon atoms.

* Adding a Carbon: When you add a carbon atom, you essentially increase the value of 'n' by 1.

The Change in Formula

1. Original Formula: Let's assume the original alkene has 'n' carbon atoms: C_nH_2n

2. Adding a Carbon: After adding a carbon, the new alkene will have 'n + 1' carbon atoms.

3. New Formula: The formula for the new alkene will be C_n+1H_2(n+1).

Example:

Let's say we start with ethene (C₂H₄):

* Original Formula: C₂H₄ (n = 2)

* Adding a Carbon: n + 1 = 3

* New Formula: C₃H₆ (Propene)

Key Points

* The number of hydrogen atoms always increases by two when you add a carbon to an alkene.

* This pattern holds true for all alkenes, regardless of the initial number of carbons.

Let me know if you'd like to explore specific examples!