What are these balancing chemical reactions? (please o please help)?

I'll help you with the first one so that you can do the rest yourself. Just remember when balancing equations its filling numbers and checking if they work and its usually best to save Oxygen and Hydrogen for last. For the first question See that you have 3I on the left of the equation sign but 2 I on the right. To make them even put a 2 in front of ALI3 and a 3 in front of I2. Now you have 6 I on each side but you also have 2 Al on the left side and only 1 on the right so put a 2 in front of Al on the right. Putting the 2 in front of AlBr3 gives you 6 Br on the right so put a 3 in front of Br on the left side of the equation and your equation is now balance.. it is 2AlI3 +3Br2 = 2AlBr3+3I2