Those items float.
Because the items are less dense than water, they float. If they are more dense than water, they sink.
Answer:

Explanation:
1. Find the order of reaction
Use information from the graph to find the order.
If a plot of ln[A] vs time is linear, the reaction is first order and the slope = -k.
2. Find the half-life

Answer:
answer is A. Alkaline metal lose two electrons not gain
2000/18 =111.111111
111.1 moles