The Following Journal Entries with the Amounts Omitted Were Taken $\quad$

The following journal entries with the amounts omitted were taken from the records of Lena Company:
1. Cash
$\quad$$\quad$ Contributed Capital
2. Inventory
$\quad$$\quad$ Accounts Payable
3. Accounts payable
$\quad$ $\quad$ Cash
4. Buildings
$\quad$ $\quad$ Cash
$\quad$ $\quad$ Mortgage Payable
5. Retained Earnings
$\quad$ $\quad$ Dividends Payable
6. Cash
$\quad$$\quad$ Notes Payable Requirement:
Write a brief explanation for each of the above transactions.