What would the chemical make-up of a silicon based life-form be like?

I've recently become interested in the possibility of silicon based life. Assume these creatures developed on a planet with zero carbon (don't question, just accept it), so they have no carbon in their bodies. For this question, it would also be helpful to know what kinds of conditions would be conducive towards silicon based life. (I've excluded carbon because I know it is generally more effective for life-forms to evolve with it.)

Now, what would the chemical make-up of these creatures be like? Assume they are nearly like humans, except with silicon. Would they also be made up of lots of water, or would they have ammonia blood? Would they have higher internal body temperatures? Would anything else have to be different?

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What would the chemical make-up of a silicon based life-form be like?

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