what's the difference between piece and slice?
we can say, a piece of bread, a piece of tomato, a slice of onion. but what's the difference between them?

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Answer

When we talk about dividing food among a few people, we normally use "slice" just before the cutting (e.g., "Would you like a slice of cake? / I'll have a slice of pie, please.").  Later, in discussing the meal, we'll usually use "piece" (e.g., "I had a big piece of birthday cake last night").

Answer

I wouldn't say 'Piece of tomato' but have difficulty figuring out why... It's definitely 
If in doubt use 'some' 哈哈 to avoid the dilemma.  Look at the meaning of slice: 'a tin broad piece or wedge cut off.  CUT is the key word.  If it's not 'cut' (literally or metaphorically) it's not a slice.  Hmmm How about a slice of the action - that's where you take 'your cut'.  But if it's easy  it's a 'piece of cake'  555.  Ok, I've said my piece.

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