Suppose a piece of silver jewelry contains 5.19×1022 atoms of silver (Ag). How many dozens of silver atoms are in the piece of jewelry?
Express your answer numerically in dozens.

When you mate two plants together the terms is called? answer it fast as possible plz! i have a test tomorrow!

Agroup of students is studying convection current. they fill two identical balloons with the same amount of helium. one balloon is placed in a freezer and the other is in an area with warm air. after 10 minutes, the balloon are released from a height of 1 meter. which of the following to the students most likely observe? a) the warm balloon expands and rises. the cold balloon shrinks and sinks b) the balloon both rise. the cold balloon is larger than the warm balloon c) the cold balloon expands and rises. the warm balloon shrinks and sinks d) the balloon rise at the same rate. both balloons are the same size

In the following redox reaction which is the oxidizing agent and which is the reducing agent? alcl3 + na nacl + al oxidizing agent = reducing agent =