What is the hybridised structure of b2h6?

Rutherford's experiment indicated that matter was not as uniform as it appears what part of his experimental results implied this idea

100 grams of molten lead (600°c) is used to make musket balls. if the lead shot is allowed to cool to room temperature (21°c), what is the change in entropy (in j/k) of the lead? (for the specific heat of molten and solid lead use 1.29 j/g⋅°c; the latent heat of fusion and the melting point of lead are 2.45 × 104 j/kg and 327°c, respectively.)

How much heat is added if 0.814g of water increase in temperature by 0.351 degree c?