I needs some hel with this project, I want to build a simple clock using a time chip (DS1307

Transmit the External Device address with the LSb cleared. //Enables the device and sets to write mode. How'????
Transmit the Internal address. //Sets the address to start reading data from. How????
Transmit the External Device address with the LSb set. //Enables the device and sets to read mode. How ?????
question1 : Is 16 decimal number ?
question2 16 is assigned to Address variable ? ISN'T İT ?
3.a) means of dot (.) before 'Adress' ?
3.b).Address makes decimal to hex conversion ?