Largest change in the water level [closed]








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> 
> Which would produce the largest change in the $\ce{H2O}$ level when added to water in a $\pu{25 mL}$ graduated cylinder?
> 
> 
> (**A**) $\pu{10.0 g}$ of $\ce{Hg}$ $(d = \pu{13.6 g/mL})$  
> 
> (**B**) $\pu{7.42 g}$ of $\ce{Al}$ $(d = \pu{2.70 g/mL})$  
> 
> (**C**) $\pu{5.09 g}$ of iron pyrite $(d = \pu{4.9 g/mL})$  
> 
> (**D**) $\pu{2.68 g}$ of oak $(d = \pu{0.72 g/mL})$
> 
> 
> 


I approached this question by dividing the mass by density to find the volume change. Thus, I got the answer (**D**), but the answer is (**B**).


Can anyone please explain this?




Because it’s density is less than 1, the oak floats. 


Therefore it displaced less than its full volume; some of the floating oak is above water. 


Since it’s 2.68g of oak, it displaces only the volume equivalent to 2.58g of water. 


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Because oak has a density less than water (1g/mL), it won't be fully submerged. For substances more dense than water, they will be fully submerged so you don't have to worry about it. See [this video](https://www.youtube.com/watch?time_continue=151&v=sMkHKMsBEl8&feature=emb_title) to calculate how much of the oak will be submerged.


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