Write the net ionic equation for the precipitation of manganese(ii) carbonate from aqueous solution:

Measuring which physical property is most likely to produce the most precise results when trying to identify a substance

Can someone me with questions 12 and 13 plz.

Why does earth rotate? because earth is formed from cold gases collapsing due to gravity because the matter in the nebula that formed earth was spinning because earth forms more than 99% of the mass of the solar system because the hydrogen atoms inside the nebula fused to form helium